• 专利附录
  • 专利说明
  • 权利要求
  • 类似技术
  • 同族专利
  • 引用文献
  • 法律状态
  • 优先权
    • 专利摘要:
    The invention relates to a method for monitoring a cooling or heating device, which is provided for tempering a device (1) with an electronic circuit, wherein the cooling or heating device comprises a blower (18), which comprises a device (1) and the generated electronic circuit passing airflow. In a step a), the electronic circuit is transferred from a first to a second state of activity or such a change is detected. In a step b), the temperature (T) of the electronic circuit is detected in the second state of activity. Then, in a step c), it is checked whether a temporal change of the temperature (T) lies outside a predefinable target range and in a step d) triggers an alarm for a malfunction of the cooling or heating device if the result of the check is positive. In addition, a monitoring device (20) for carrying out the method according to the invention, as well as a control cabinet (14, 14 ') comprising such a monitoring device (20) are specified.
    公开号:AT511971A2
    申请号:T1439/2011
    申请日:2011-10-05
    公开日:2013-04-15
    发明作者:
    申请人:Fronius Int Gmbh；
    IPC主号:
    专利说明:

    · · F f · «f I ·« ** * ·· • 11 ·. ! ::; i! * l · · · * / · *
    The invention relates to a method for monitoring a cooling or heating device, which is provided for controlling the temperature of a device with an electronic circuit, wherein the cooling or heating device comprises a fan which generates an air stream passing through the device and the electronic circuit. Furthermore, the invention relates to a monitoring device for a cooling or heating device, which is provided for controlling the temperature of a device with an electronic circuit, wherein the cooling or heating device comprises a fan, which is prepared for the generation of a device and the electronic circuit passing air flow , Finally, the invention relates to a control cabinet, comprising a device to be tempered with an electronic circuit and a blower, which is prepared for generating a the cabinet, the device and the electronic circuit passing air flow. Furthermore, the control cabinet comprises a monitoring device of the type mentioned. Cooling or heating devices for tempering a device with a fan for generating an air flow are well known. For example, computers, devices in electrical cabinets and the like are often tempered in this way. Frequently, a filter is arranged on the supply side to remove dirt particles and the like from the air supplied to the device. But it is also known to arrange a filter on the exhaust side, for example, if the device secrets hazardous substances or dirt and the exhaust air must be cleaned to avoid environmental damage.
    It is in the nature of things that over time dirt particles and the like deposit in the filter and thus increase the flow resistance of the same successive N2010 / 17500. This reduces the air flow and, consequently, the heat output supplied to or removed from the unit while the fan output remains the same. Therefore, the filter must be renewed if it is dirty, so as not to risk, for example, overheating and possibly destruction of the device to be tempered.
    This can be done at regular intervals, regardless of a specific contamination of the filter, or at a certain level of contamination. From the prior art, some solutions are known to determine the degree of contamination of a filter, for example by the pressure loss is measured at the same. This requires a comparatively expensive differential pressure sensor, which is also technically limited limited replaceable in very dirty cooling air.
    Another possibility for determining the degree of contamination of a filter is disclosed in WO 2002/19511 A1. In this case, a cooling device comprises a fan and a filter arranged in the flow path. The fan is preferably driven at constant torque. Increases the speed of the fan now due to contamination of the filter, so an alarm signal can be triggered, which signals a dirty filter.
    In addition to the mentioned contamination of the filter, other defects may occur in a cooling or heating device. For example, the blower for generating the air flow may be defective, for example due to engine damage, bearing damage or damage to a control electronics of the blower. In particular, if there is no filter on the supply side, dirt (for example, leaves and the like) can also settle in the ventilation system and clog it gradually. Plant growth in front of a suction opening can also disturb the ventilation system. Occasionally, animals in a ventilation system also seek supplements and may end up there. This too is one reason for a clogged ventilation system and consequently for cooling or heating with only more limited function. N2010 / 17500
    It is an object of the invention to provide a further improved method for monitoring a cooling or heating device and a further improved monitoring device for this purpose. In addition, an improved control cabinet should be specified. In particular, the monitoring should be simplified and carried out with the aid of parameters which can be measured easily, or with the aid of parameters which under certain circumstances may already be determined or generated for other purposes and thus be able to fulfill a double benefit.
    The object of the invention is achieved by a method of the aforementioned type, comprising the steps: a) transfer of the electronic circuit from a first to a second state of activity and / or recognition of such a change, b) detecting the temperature of the electronic circuit in the second state of activity , c) checking whether a change in temperature over time is outside a predefined target range and d) triggering an alarm for a malfunction of the cooling or heating device if the result of the test is positive.
    The invention is further achieved with a monitoring device of the type mentioned above, comprising a switching device for transferring the electronic circuit from a first to a second state of activity and / or means for detecting such a change, a temperature sensor for detecting the temperature of the electronic circuit in the second state of activity and
    Means for checking whether a temporal change in temperature is outside a presettable target range and for triggering an alarm for a failure of the cooling or heating means if the result of the check is positive
    Finally, the object of the invention is achieved by a control cabinet of the type mentioned, comprising a monitoring device according to the invention. N2010 / 17500
    According to the invention, therefore, a change in the temperature of the device to be cooled or heated, in particular an electronic circuit comprised thereof, for detecting a malfunction of the cooling or heating device (eg dirty filter, clogged ventilation system, defective blower due to bearing damage, engine damage, defect of the blower control, etc .) used. In this case, one makes use of the fact that a change in the state of activity of the electronic circuit and thus a change in the output of the electronic circuit power loss causes a change in temperature of the circuit when the cooling / heating power is not adjusted accordingly. Depending on the temperature difference between the electronic circuit and the temperature of the passing air, the temperature of the electronic circuit approaches the temperature of the passing air faster or less quickly. Another influencing parameter for this is also the power loss delivered by the electronic circuit during the temperature detection, which counteracts the mentioned temperature change. If the temperature now changes more slowly than expected, this is an indication of a malfunction of the cooling or heating device, which leads to a reduction in the air flow and thus to a reduction in the cooling or heating power. The relevant target range can be determined by empirical experiments or with the help of computer models.
    In particular, if a temperature sensor is already present on the electronic circuit for other purposes, a contamination detection can be realized in this way without significant additional effort. This is also very robust and reliable, since a contact of a sensor with the conveyed medium - unlike for example in a differential pressure gauge-can be avoided.
    Advantageous embodiments and developments of the invention will become apparent from the dependent claims and from the description in conjunction with the figures. N2010 / 17500
    It is favorable for the method according to the invention if, in addition, an ambient temperature is detected and the desired range depends on this. It is not always possible to assume a constant, known ambient temperature, as is the case, for example, in air-conditioned rooms or, to a lesser extent, in cellars. Therefore, if the ambient temperature is not known from the beginning and / or fluctuates comparatively strongly, it is favorable to detect this since the cooling or heating power depends on the temperature difference between the ambient temperature and the device to be tempered. Accordingly, different target ranges can be provided for different ambient temperatures or temperature differences. If the temperature difference between the electronic circuit and the ambient temperature is low, the temperature of the electronic circuit changes less rapidly than the temperature of the passing air, so that a slight change in the temperature over time does not necessarily indicate that the cooling or heating device is malfunctioning. By appropriate adjustment of the target ranges this fact is taken into account. The ambient temperature can be measured, for example, via a temperature sensor provided for this purpose, or can also be determined via weather data provided centrally, for example via a wired communication connection or a radio connection. For example, related services can be used on the Internet. If not so high demands are placed on the detection reliability of the disturbance of the cooling or heating device, a measurement of the ambient temperature can still be omitted even if it is unknown and / or varies relatively strongly. The detection safety of the disturbance of the cooling or heating device increases with decreasing fluctuation of the ambient temperature and decreases with increasing fluctuation.
    It is advantageous if steps b) to d) are carried out if the ambient temperature and / or the difference between the ambient temperature and the temperature of the electronic circuit and / or a power supplied to the electronic circuit are within a predeterminable range at the beginning of the second activity state lie. In this variant of the invention it is ensured N2010 / 17500 that the expected temperature change is large enough or fast enough so that measurement tolerances do not unintentionally lead to a false alarm when the temperature is too low. It is favorable for the method according to the invention if in addition a humidity and / or an air density of the air flow are detected and the desired range depends on this or these. Since the air humidity and the air density also have an influence on the cooling performance (moist or dense air cools more strongly), the air humidity and / or the air density can also be determined. The statements made for the ambient temperature apply mutatis mutandis. For example, the air humidity and / or the air density can be determined by separate sensors or centrally provided weather data. The steps b) to d) are advantageously carried out only if the air humidity and / or air density of the air flow is within a predeterminable range and thus a sufficiently strong temperature change of the electronic circuit is to be expected.
    It is also advantageous if an electrical power which is conducted via the said electronic circuit is detected and the steps b) to d) are carried out if a temporal change of the power over a predefinable threshold value is detected. Again, this is one way to determine whether the expected temperature change will be strong enough to provide a meaningful result before testing the refrigerator or heater. For this purpose, the temporal gradient of the power can be evaluated or else the power can be determined at two points in time and the power difference compared with a threshold value. It is also possible to compare the time required for a certain power change with a threshold value. As a particularly advantageous for the inventive method, a sudden change in the electrical power has been found.
    Of course, the parameters temperature difference, power, humidity and air density or parts thereof may also be combined to determine whether or not steps b) to d) should now be performed. N2010 / 17500
    It is also advantageous if the stated power is determined via the power supplied to an energy converter for generating electrical current, which is conducted via the electronic circuit. Optionally, to determine whether steps b) to d) are to be carried out, instead of the power supplied via the inverter, it is thus also possible to use, e.g. used in a photovoltaic system radiated power.
    It is particularly advantageous if step a) is carried out by activating or deactivating the electronic circuit. As already mentioned, it is advantageous if the power conducted via the electronic circuit breaks down as sharply as possible or increases as much as possible (in particular erratic) and the other circumstances mentioned (eg suitable ambient temperature, air humidity, air density) fit to an accurate statement about be able to meet the state of the cooling or heating device. Sometimes, however, such a power dip or increase does not occur or does not occur at the desired time. For this reason, it is provided in this variant of the invention to cause such a power dip or increase in power in step a) by activating or deactivating the electronic circuit. The temperature of the device then strives as already explained to a different temperature level. The strength of this temperature change is evaluated as usual in order to make a statement about the failure of the cooling or heating device can. It is also advantageous if the electronic circuit comprises at least one heat sink for controlling the temperature of at least part of said circuit, the fan generates an airflow passing through the heat sink and that instead of the electronic circuit only the said circuit part is used for the inventive method.
    In this case, the blower generates a stream of air passing through the heat sink, and instead of the electronic circuit only the said circuit part is used for the method according to the invention. This means that only the current state of this circuit part has to be changed and its temperature or that of the associated heat sink must be determined. In this way, a particularly good coupling between the air flow and the circuit is given, so that a compensation of the temperature of the circuit part when changing the state of activity corresponding to rapidly. It is particularly advantageous in this context if the temperature sensor is arranged on the at least one heat sink, since said coupling and the associated rapid temperature compensation are even more pronounced. Moreover, a temperature sensor is often already provided on the heat sink in order to detect an overload of the device and to be able to switch off this if necessary. This temperature sensor can thus fulfill a double benefit.
    It is particularly advantageous if step a) is carried out by activating an electrical heating element arranged in the circuit, in particular on the heat sink. A further possibility to determine the state of the cooling or heating device with the method according to the invention consists in that step a) is carried out by activating an electrical heating element arranged in the circuit, in particular on the heat sink. This can in principle be done at any time, but a particularly high change in the temperature of the heat sink is expected then when the device is not in operation. If the heating element is now activated, the electronic circuit, in particular the heat sink, on which the heating element is arranged, is heated or cooled down when the heating element is switched off. As already described, this temperature change can be used to determine the state of the cooling or heating device.
    It is particularly advantageous if a plurality of desired ranges can be predetermined, wherein each desired range identifies an assigned degree of the disturbance of the cooling or heating device, in particular an associated degree of soiling of the filter, and wherein the alarm triggered when a specific target range is exceeded is information about the associated alarm Pollution degree contains. This variant enables the delivery of differentiated alarm messages. N2010 / 17500
    For example, levels of pollution and associated alarms for light, medium and heavy pollution can be defined. It is conceivable to activate colored lamps or light-emitting diodes according to a traffic light system. For example, "green" means limited cooling or heating capacity (in particular incipient pollution) but still in order, "yellow" borderline cooling or heating power or pollution, and "red" lack of cooling or heating power or excessive pollution. It is advantageous if the alarm is transmitted via mobile network and / or the Internet. In this way, the alarm of the person responsible for the care of the Kühloder or heating device can be delivered directly, for example by means of the Short Message Service (SMS) or by email, so the person does not need to be on site to take note of an alert to be able to. It is also beneficial if an alarm is recorded in a memory. This makes it easier for the manufacturer of the device to be tempered to discuss the question of guilt, for example if it becomes defective because of a clogged filter. If it is found that requests to replace the filter have been ignored by the operator of the device mentioned above, this is a strong indication that the fault lies with the operator of the broken device.
    In order to increase the reliability of the method according to the invention, it can be provided that in step d) a further test of the cooling or heating device is performed and only then alarm for a malfunction of the cooling or heating device is triggered when the result of both tests is positive , It can be provided that the further test is carried out in the same manner as the first test. But it is particularly advantageous if the further test is carried out in a different manner, as will be explained below. Of course, more than two tests can form the basis for deciding whether an alarm should be triggered or not.
    It is advantageous in this context if a performance of the fan is increased with increasing deviation between the setpoint and actual temperature of the device N2010 / 17500
    and further testing the cooling or heating the steps:
    Detecting a characteristic of the performance of the blower and
    Check whether the parameter lies outside a predefined target range. Frequently, a cooling / heating device comprises a control which increases a power of the fan with increasing deviation between the setpoint and actual temperature of the device to be tempered. In this variant of the invention, the power supplied to the fan or the power supplied by it is used directly or indirectly to detect a malfunction of the cooling or heating device. In this case, one makes use of the fact that the said control the performance of the fan with increasing degree of contamination of the ventilation system, in particular the filter, nachzuführen to compensate for the increased pressure loss and to the air flow and thus the cooling or heating power constant hold. A parameter which characterizes the performance of the fan can be determined very simply or is already known to the regulation for controlling the temperature of the device. In this way, additional contamination detection can thus be realized without significant additional effort, which is also very robust and reliable, since a contact of a sensor with the conveyed medium - unlike for example in a differential pressure gauge-can be avoided. It is advantageous if the blower parameter is also used to define the desired range or ranges in step c) and to decide whether steps b) to d) are to be performed.
    It is also advantageous, if as the performance of the blower characterizing parameters applied to a drive motor of the fan electrical voltage (eg measured with a voltmeter), the electrical current received by a drive motor (eg measured with an ammeter), the recorded by a drive motor electric power (eg measured with a Wattmeter), the actual speed of a drive motor (eg measured with a tachometer) and / or the target speed of a drive motor is provided N2010 / 17500. These parameters can be very easily detected or have ever been detected for other purposes. For example, a target speed, which is specified by the control / regulation for controlling the temperature of the device, be taken directly for the inventive method. Likewise, it is conceivable that the control / regulation specifies a desired voltage, a desired current or a desired power, which can be adopted accordingly.
    It is also advantageous in this context if, in addition, a temperature of the device, in particular a difference between a setpoint and an actual temperature, is detected and the setpoint range for the blower parameter depends thereon. The power supplied to the blower also depends on the temperature of the appliance itself or the temperature difference due to the temperature control of the appliance, because as the deviation between the actual temperature and the set temperature increases, the performance of the blower is also increased. An increased fan power thus does not necessarily result from a malfunction of the cooling or heating device, but may, for example, be due to an increased power requirement on the device to be cooled. Therefore, there is a fundamental risk that the temperature-induced power increase is "misinterpreted" as a failure of the cooling or heating device. The detection uncertainty also decreases with decreasing variation of the device temperature. This means that with constant power of the device also a constant heat output has to be removed. An increase in the fan power is therefore very likely due to a malfunction of the cooling or heating device.
    However, if the power of the device fluctuates so much that the fluctuations can no longer be neglected (for example, this is often the case with inverters), the said power is taken into account in an advantageous variant of the invention. For example, the power currently supplied to the device or the power dissipation of the device (which basically causes the device to heat up) is detected and the target range for checking whether the parameter indicating the performance of the blower is outside a predeterminable soil range is adjusted accordingly. With higher unit performance, the nominal range N2010 / 17500: -12 - is slightly widened, so that an increased blower output, which is due to the increased performance of the device to be tempered, does not yet trigger an alarm. Accordingly, the target range is somewhat narrowed with smaller device performance. Alternatively, the test can also be triggered at a given power of the device or carried out at constant power of the device. It is particularly advantageous if the test of the cooling or heating device is always carried out at the same power of the device, since the individual measurement results, i. E. the size of a parameter characterizing the performance of the blower can be compared particularly well with each other.
    It is also advantageous if, in addition, an ambient temperature is detected and the desired range for the blower parameter depends on this. In particular, if the ambient temperature fluctuates greatly, the already mentioned detection uncertainty can be reduced by measuring the ambient temperature.
    It is also advantageous if the power loss of the device and a performance descriptive parameter of the fan, e.g. the speed is kept constant and the further check of the cooling or heating means the steps:
    Detecting the difference between the ambient temperature and the temperature of the electronic circuit and
    Check whether the difference lies outside a predefined target range.
    In this variant, the air flow provided for the temperature control is less in the case of a malfunction of the cooling or heating device and thus the cooling / heating power than if the cooling or heating device is not disturbed. This manifests itself in the fact that the difference between the ambient temperature and the temperature of the electronic circuit increases. If it exceeds a certain threshold, this is therefore an indication of a malfunction of the cooling or heating device.
    It is also advantageous if an inverter is provided in the control cabinet according to the invention as an apparatus to be tempered. Inverters M2010 / 17500 find quite often in control cabinets, for example in solar systems, welding systems, motor controls and the like. Often relatively high power is performed on such an inverter, so this must be cooled as a rule. The advantage of the invention is therefore particularly apparent at this point. It is advantageous if the circuit part to be tempered is formed by at least one switching transistor or at least one switching thyristor of the inverter. The components mentioned carry the majority of the electrical power of the inverter and therefore also emit a correspondingly high power loss, in particular to a heat sink connected to the switching transistors or switching thyristors
    It should be noted at this point that the variants mentioned for the method according to the invention and the resulting advantages relate equally to the monitoring device according to the invention and the control cabinet according to the invention. The same is true, of course, vice versa.
    For a better understanding of the invention, this will be explained in more detail with reference to the following figures,
    Each shows in a highly schematically simplified representation:
    1 shows the schematic structure of an inverter or a solar system.
    FIG. 2 shows a first exemplary variant of a control cabinet according to the invention; FIG.
    3 shows an exemplary course of the power conducted via an inverter of a photovoltaic system and its temperature;
    4 shows an exemplary table in which an association between the
    Temperature of an inverter and multiple target ranges for the speed of a fan is included and N2010 / 17500 U ri
    5 shows a second exemplary variant of a control cabinet according to the invention.
    By way of introduction, it should be noted that in the differently described embodiments, the same parts are provided with the same reference numerals or the same component names, wherein the disclosures contained in the entire description can be mutatis mutandis to the same parts with the same reference numerals or component names. Also, the location information chosen in the description, such as top, bottom, side, etc. related to the immediately described and illustrated figure and are to be transferred to the new situation mutatis mutandis when a change in position. Furthermore, individual features or combinations of features from the different exemplary embodiments shown and described can also represent independent, inventive or inventive solutions. All statements on ranges of values in the description of the present invention should be understood to include any and all sub-ranges thereof, e.g. the indication 1 to 10 should be understood to include all sub-ranges, starting from the lower limit 1 and the upper limit 10, i. all subregions begin with a lower limit of 1 or greater and end at an upper limit of 10 or less, e.g. 1 to 1.7, or 3.2 to 8.1 or 5.5 to 10.
    In Fig. 1 shows a structure of a conventional inverter 1. Since the individual components or assemblies and functions of inverters 1 are already known from the prior art, will not be discussed in detail below.
    The inverter 1 has at least one input DC-DC converter 2, an intermediate circuit 3 and an output DC-AC converter 4. At the input DC-DC converter 2, a power source 5 or a power generator is connected, which are preferably formed from one or more parallel and / or series-connected solar modules 6. The inverter 1 and the solar modules 6 are also called "photovoltaic system" or "PV system" N2010 / 17500
    (k
    net. The output of the inverter 1 or of the output DC-AC converter 4 can be connected to a supply network 7, e.g. a public or private AC network or a multi-phase network, and / or connected to at least one electrical load 8, which is a load. For example, a consumer 8 is constituted by an engine, a refrigerator, a radio, and so on. Likewise, the consumer 8 can also represent a home care. The individual components of the inverter f, such as the input DC-DC converter 2, etc., can be connected to a control device 10 via a data bus 9.
    Preferably, such an inverter 1 serves as a so-called grid-connected inverter 1, whose energy management is then optimized to feed as much energy into the grid 7 as possible. As is known from the prior art, the consumers 8 are supplied via the supply network 7. Of course, a plurality of inverters 1 connected in parallel can also be used. As a result, more energy for operating the consumer 8 can be provided.
    This energy is supplied by the power source 5 in the form of a DC voltage, which is connected via two connecting lines 11, 12 with the inverter 1.
    The controller 10 or the controller of the inverter 1 is formed for example by a microprocessor, microcontroller or computer. Via the control device 10, a corresponding control of the individual components of the inverter 1, such as the input DC-DC converter 2 or the output DC-AC converter 4, in particular the switching elements arranged therein, are made. In the control device 10, the individual control or control processes are stored for this purpose by appropriate software programs and / or data or characteristics.
    Furthermore, 10 control elements 13 are connected to the control device, by which the user configure, for example, the inverter 1 and / or indicate operating conditions or parameters - for example by means of N2010 / 17500
    Light emitting diodes - and can adjust. The controls are connected for example via the data bus 9 or directly to the control device 10. Such controls 13 are arranged for example on a front of the inverter 1, so that an operation from the outside is possible. Likewise, the controls 13 may also be arranged directly on assemblies and / or modules within the inverter 1.
    FIG. 2 now shows how the inverter 1, which comprises an electronic circuit, can be arranged in a housing or a control cabinet 14. The control cabinet 14 has a supply air opening 15 and an exhaust opening 16. At the supply air opening 15, a filter 17 and at the exhaust port 16, a blower 18 is arranged. If the blower 18 is activated, ambient air flows through the supply air opening 15, the filter 17, past the inverter 1, through the blower 18 and finally through the exhaust air opening 16. The flow pattern of the air is shown in FIG. 2 with arrows indicated. In the present case, it is assumed that the ambient air is cooler than the inverter 1, which is why it is cooled, and more so, the more power is supplied to the drive motor of the blower 18. For this purpose, an optional control 19 may be provided which measures the temperature of the inverter 1 and controls the fan 18 accordingly, i. its power increases when the temperature of the inverter 1 and the difference between its setpoint and actual temperature increases. For the sake of simplicity, however, it is assumed for the time being that the control system 19 is not provided or is integrated in a higher-level control (not shown).
    Furthermore, the arrangement comprises a monitoring device 20, the cooling or the heating device, which with a temperature sensor 21 for detecting the temperature of the electronic circuit and a temperature sensor 22 for detecting the temperature of the intake air, i. the ambient temperature. Furthermore, the monitoring device 20 comprises a switching device, not shown, for transferring the electronic circuit from a first to a second activity state and / or means for detecting such a change, and means for checking whether a time change of the temperature N2010 / 17500 outside a predetermined target range and for triggering an alarm for a malfunction of the cooling or heating device, in particular for a clogged filter 17, if the result of the test is positive.
    The function of the arrangement shown in FIG. 2 will now be explained with reference to the PV system of FIG. 1 with further reference to FIG.
    FIG. 3 shows the typical course of the power P irradiated by the sun over the time t during the course of a day (solid line). The power P increases gradually in the morning, reaching the maximum at around noon and falling towards evening. Fig. 3 shows only the basic course, of course, this also depends on the orientation of the PV system and objects that shade them during the day from. In addition, the time profile of the temperature T of the inverter 1 is also entered (dot-dash line). This rises in the morning, then remains because of the cooling effect of the blower 18 at a constant power P in about constant and drops in the evening again.
    By way of example, it is now assumed that in the morning a dense cloud field passes over the PV system and obscures the otherwise cloudless sky. This manifests itself in a relatively strong and sudden incidence of the etnge-radiated power P. However, the power P, which is conducted via the inverter 1, changes just as suddenly, which is essentially determined by the radiated power P times the efficiency of the solar modules 6. According to the invention, such a transfer of the electronic circuit from a first to a second activity state, in this case the drop in the power P, is detected by the monitoring device 20 in a step a). During the shading, the temperature approaches T because of the sweeping over the inverter 1 air in a conventional manner the ambient temperature, in accordance with the known function ΔΤΊ-β ^. In the concrete example, the (residual) power P guided in spite of the clouds via the inverter 1 must also be taken into consideration, for which reason the desired limit value is slightly above the ambient temperature. N2010 / 17500
    According to the invention, in a step b) the temperature T of the electronic circuit is detected in the second activity state, in a step c) checked whether a temporal change in temperature T is outside a predetermined target range and in a step d) an alarm for a malfunction of the cooling - or heating device triggered when the result of the test is positive. If the temperature T does not decrease rapidly enough, this is a strong indication that the cooling or heating device is disturbed, for example because the filter 17 is clogged, since the volume flow and thus the cooling effect are low despite the fan 18 running. For this purpose, for example, it can be checked whether the temporal gradient of the temperature T lies in an expected range, or, for example, the temperature T is determined at two times and the temperature difference is compared with a threshold value. It is also possible to compare the time required for a certain temperature change with a threshold value.
    Similarly, the subsequent heating of the inverter 1 can be used for the detection of a disturbance of the cooling or heating device when the cloud field has passed, and then the full power P is radiated back into the PV system.
    For the temperature change to be meaningful, i. strong enough fails, it can also be provided that the steps b) to d) are carried out when the ambient temperature and / or the difference between the ambient temperature and the temperature T of the electronic circuit at the beginning of the second state of activity within a predetermined range, in particular above a threshold. Thus, a disturbance of the cooling or heating device with initially high irradiation power P and low outside temperature, ie. for example in the morning or in winter. In this context, it is also advantageous if an electrical power P, which is guided via said electronic circuit, is detected and the steps b) to d) are carried out, if a temporal change of the power P is determined beyond a predefinable threshold , For this purpose, the temporal gradient of the power P can be evaluated or also the N2010 / 17500 .-> 9
    Power P are determined at two times and the power difference compared to a threshold. It is also possible to compare the time required for a certain power change with a threshold value.
    Since the air humidity and the air density also have an influence on the cooling performance (moist or dense air cools more strongly), the air humidity and / or the air density can also be determined, for example by separate sensors or centrally provided weather data, which are transmitted via a wired communication connection or a radio connection are received. Accordingly, the steps b) to d) are carried out when the air humidity of the air flow and / or air density is within a predeterminable range and thus a sufficiently strong change in temperature of the electronic circuit is to be expected.
    Of course, the above parameters, i. Temperature difference, power, humidity and air density or parts thereof are also combined to determine whether the steps b) to d) should now be carried out or not.
    In a very similar way, the parameters can be used individually or in any combination to determine the setpoint range for the temperature change, which is relevant for triggering an alarm. For example, with little change in the power P (which causes only a slight difference between the temperature T at the beginning of the second state of activity of the inverter 1 and the end temperature asymptotically approaching the temperature T of the inverter 1), even a slight temperature change will occur Indicate malfunction of the cooling or heating device and vice versa.
    In the present case, it was assumed that the control cabinet 14 is set up in the outer area, which is why it makes sense to measure the ambient temperature or to acquire it via centrally provided weather data. Frequently, however, control cabinets are also installed in rooms with a constant or approximately constant temperature T, for example in air-conditioned rooms or cellars. A detection of the ambient temperature can then be omitted. N2010 / 17500
    Optionally, in order to determine whether steps b) to d) should be carried out, instead of the power P conducted via the inverter 1, the power P radiated into the PV system should also be used. For example, a photosensitive sensor is mounted in the region of the solar modules 6 and connected to the monitoring device 20. In general, the invention can of course also be used away from PV systems. In particular, it is advantageous in inverters of energy converters for generating electrical power, thus, for example, in wind power plants, tidal power plants and the like.
    As already mentioned, it is also advantageous if the power P guided via the electronic circuit or its power dissipation (which basically leads to heating of the electronic circuit) collapses as much as possible and the other circumstances mentioned are also suitable (eg ambient temperature, air humidity, air density) ) in order to be able to make a precise statement about the state of the cooling or heating device, in particular of the filter 17. Sometimes, however, these circumstances do not occur or do not occur at the desired time. Passing clouds can not be "ordered". For this reason, it can be provided in a variant of the invention that step a) is carried out by activating or deactivating the electronic circuit. In Fig. 3, this state is shown shortly after noon. The inverter is deactivated so that no more power P is passed through it. The temperature T of the inverter thus strives for the air flow caused by the fan 18 to the ambient temperature. An examination of the cooling or heating device can therefore be carried out in the manner already described.
    In general, the power section of an inverter 1 is cooled by a heat sink. With this at least part of the electronic circuit, in the case of an inverter 1 usually the switching transistors or switching thyristors, substantially cooled. It is advantageous in this case when the temperature sensor 21 is arranged on the at least one heat sink. In this case, the blower 18 generates a stream of air passing through the heat sink, and instead of the electronic circuit only the mentioned circuit part for N2010 / 17500-21 is used for the method according to the invention. This means that only the activity state of this circuit part has to be changed and its temperature T or that of the associated heat sink must be determined.
    Another way to determine the state of the cooling or heating device with the method according to the invention is that step a) by activating a in the circuit, in particular on a heat sink, arranged electrical heating element is performed. This can in principle be done at any time, but a particularly high change in the temperature T of the heat sink is expected then when the inverter 1 is not in operation. In the case of a PV system, this is to be expected in the night hours. In the example shown in FIG. 3, the heating element is therefore activated at night, whereby the electronic circuit, in particular the heat sink, on which the heating element is arranged, in the already heated or cooled again when switching off the heating element. As already described, this temperature curve can be used to determine the state of the cooling or heating device. If the fan 18 is not operated continuously, it can be advantageously activated only after the heating element has been heated up with the described heating element, so that the heat sink is then actively cooled.
    If the circuit comprises or is formed by an inverter 1, then step a) can be carried out by converting the inverter 1 into a operation with a defined power loss. In this variant, the aforementioned method can also be carried out without a separate heating element. Such a defined power loss can be generated by operating the inverter in reactive power mode: The inverter does not feed any active power of the PV system, but only reactive power into the grid. He works as a reactive power compensation system in the so-called "phase shifter operation". The resulting losses in the inverter heat the electronic circuit with the associated heat sink. After the end of the supply of reactive power, the circuit cools down again. For this purpose, no sunlight is needed; This process can, for. At night, the phase voltage NZ010 / 17500 shifter operation changes the mains voltage at the feed-in point. It is therefore important to allow phase shifter operation only in a range in which the mains voltage is not unduly changed, ie, that in reactive power operation by the inverter, in particular by the control device of the inverter, the injected reactive power and the mains voltage is monitored and regulated, that the change in the mains voltage of the public supply network is within a permissible range defined in the inverter. For this purpose, it is possible for corresponding setpoints or range for the permissible change in the mains voltage to be stored in the inverter so that an increase or decrease in the reactive power fed in is changed within the specified limits at the supply voltage detected at the feed-in point.
    Furthermore, it is possible that the temperature inside the inverter is detected at the same time so that the inverter can not overheat. After the inverter has been heated to a predefined temperature, the cooling or heating device, in particular the fan, is activated and the time is taken until the inverter has been cooled to a defined low temperature, ie the running time for cooling from a first value ( heated) is cooled to a defined second value (lower value), so that conclusions are drawn on the basis of the determined time on the degree of contamination. For this purpose, a corresponding table can be deposited, the appropriate parameters of the heating and cooling device, such as the speed of the fan, the nominal temperature, etc. are stored for the corresponding maturities.
    In the following, it will now be discussed in more detail in what form an alert can be made. For example, this can be done in a conventional manner by optical and / or acoustic signals. In particular, since energy generating systems are often installed in remote locations, it is particularly advantageous if the alarm is transmitted via a mobile network and / or the Internet, for example as a text or voice message. N2010 / 17500 -23-
    In addition, it can be provided that a plurality of desired ranges can be predetermined, wherein each desired range indicates an assigned degree of the disturbance of the cooling or heating device, in particular an associated degree of soiling of the filter 17, and wherein the alarm triggered when a specific setpoint range is exceeded provides information about the associated degree of soiling contains. The temperature profile shown in Fig. 3 runs so much flatter, the more impaired the cooling or heating device or the more polluted the filter 17, since its flow resistance increases with the degree of contamination. This circumstance can be made use of and trigger a differentiated alarm. For example, various alarm levels can be provided (here based on the state of the filter), such as "filter slightly dirty filter reorder", "filter borderline polluted - filter ready" and "filter heavily polluted - filter exchange".
    In addition, it can also be provided that an alarm is logged. This makes it easier for the manufacturer of the cabinet 14 to discuss the question of guilt, if e.g. the inverter 1 should become defective due to overheating. If it is determined that requests to replace the filter 17 have been ignored by the operator of the PV system, this is a strong indication that the fault for the broken inverter 1 lies with the operator of the same.
    In order to increase the reliability of the method according to the invention, it can further be provided that in step d) a further test of the cooling or heating device is performed and only then alarm for a malfunction of the cooling or heating device is triggered if the result of both tests is positive. It can be provided that the further test is carried out in the same manner as the first test. It is particularly advantageous, however, if the further test is carried out in a different way. Of course, more than two tests can form the basis for deciding whether an alarm should be triggered or not. N2010 / 17500 • · fl «* -24 -
    For example, it can be provided that a power of the blower 18 is increased with increasing deviation between the setpoint and actual temperature of the inverter 1. In FIG. 2, this is indicated by the control 19, which determines the temperature T of the inverter 1 via the above-mentioned temperature sensor 21. Of course, but also a separate temperature sensor can be used, which is particularly advantageous if the monitoring device 20 and the controller 19 are supplied by different manufacturers.
    Further testing of the cooling or heating device now comprises the steps:
    Detecting a characteristic of the performance of the blower 18 parameters and
    Check whether the parameter is outside a predefined target range.
    For this purpose, a monitoring device 20 may be provided, which: the voltage applied to the drive motor of the blower 18 electrical voltage by means of a voltage measuring device (voltmeter) and / or recorded by the drive motor electric current by means of a current measuring device (ammeter) and / or from Drive motor recorded electrical power, using a power meter (Wattmeter) and / or the actual speed of the drive motor by means of a speed measuring device (eg optical or inductive tachometer) determined and / or the target speed of the drive motor of the control 19 takes over.
    If one parameter or several parameters exceed a predefinable target range, then it can be assumed that there is a malfunction of the cooling or heating device, in particular if the temperature T N2010 / 17500 -25-
    of the inverter 1 and the ambient temperature have not or only slightly changed. However, this is quite often the case, for example, when the cabinet 14 is in an air-conditioned room or a room of more or less constant temperature (e.g., basement) and the power P supplied to the inverter 1 also varies only slightly. Of course, the monitoring device 20 according to the invention also works under unfavorable conditions, i. strongly fluctuating temperature T of the inverter 1 or strongly fluctuating ambient temperature, if greater uncertainties regarding an alarm can be accepted.
    Advantageously, said power P can however also be taken into account, for example by detecting the instantaneous power of the device and corresponding adaptation of said setpoint range. At higher power P, the setpoint range is slightly widened, so that an increased blower output, which is due to the increase in power P, does not yet trigger an alarm. Accordingly, the target range is somewhat narrowed at lower power P. Alternatively, the test can also be triggered at a predetermined (constant) power P.
    The reliability of the method according to the invention can be further increased if, in addition to the performance parameter of the blower 18, the temperature T of the inverter 1 or the difference between its setpoint and actual temperature and / or the ambient temperature or the difference between the ambient temperature and the Target or actual temperature of the inverter 1 is detected and the desired range of this / this depends. Since not only a greater impairment of the cooling or heating device, e.g. a more soiled filter 17 results in an increase in the power supplied to the fan 18, but also a higher temperature T of the inverter 1 and / or a higher ambient temperature or greater values of said temperature differences, these additional parameters are used to more accurately the target range set. For example, a certain speed of the fan 18 at a relatively low temperature T of the inverter 1 may already lead to an alarm, whereas the same speed at a height N2010 / 17500 -26- * *
    Ren temperature T of the inverter 1 still leads to any alarm. The monitoring device 20 is connected to a temperature sensor 21, which measures the temperature of the supplied air.
    In addition, it can also be provided for the additional check that a plurality of desired ranges can be predetermined, each target range indicating an assigned degree of the disturbance of the cooling or heating device, in particular an associated degree of soiling of the filter 17, and wherein the alarm triggered when a specific target range is exceeded Contains information about the assigned pollution degree. The power supplied to the blower 18 is, of course, the higher, the more the cooling or heating device is impaired or the more polluted the filter 17 is, given its constant cooling capacity, since its flow resistance increases with the degree of soiling. As already mentioned, a differentiated alarm can be triggered in this way. For example, various alerting levels related to a filter 17 may be provided, such as "lightly soiled filters - reorder filters", "borderline polluted filters - keep filters available", and "heavily soiled filters - swap filters".
    The target ranges can be stored, for example, in the form of a table. 4 shows an example of this, in which a temperature Tw of the inverter 1 maximum speeds nLv for a slight malfunction of the cooling or heating device (a lightly soiled filter 17), maximum speeds nMV for a medium failure of the cooling or heating device (a medium polluted filter 17) and maximum speeds nsv for a strong fault of the cooling or heating device (a heavily contaminated filter 17) are assigned. If the temperature Tw of the inverter 1 is, for example, 25 ° C. and a speed of more than 1200 rpm is measured on the fan 18, then an alarm for a mean malfunction of the cooling or heating device or average contamination of the filter 17 is triggered , The illustrated table is intended to give an example of a way of realizing the invention. Of course, customary modifications of the table are conceivable. In particular, instead of the temperature Tw of the inverter 1, the ambient temperature can be used to determine a setpoint range N2010 / 17500. If the temperature Tw of the inverter 1 and the ambient temperature are taken into account, then a multi-dimensional table can also be provided. Intermediate values can be interpolated in a known manner. As an alternative or in addition to the temperature Tw of the inverter 1, its power or power loss can also be taken into account in a further dimension of the table
    As an alternative to or in addition to the table, it is also conceivable that the assignment of the temperature Tw of the inverter 1 and / or the ambient temperature to the maximum rotational speeds ntv, nMv, nsv for a disturbance of the cooling or a dirty filter 17 by means of a function, for example, a polynomial function occurs.
    In another variant of the invention, a speed of the blower 18 is kept constant by the controller 20. Further testing of the cooling or heating device then comprises the steps:
    Detecting the difference between the ambient temperature and the temperature of the electronic circuit and
    Check if the difference is outside a predefined target range.
    In this variant, the air flow provided for the temperature control decreases in the event of a malfunction of the cooling or heating device and thus the cooling / heating power. This manifests itself in the fact that the difference between the ambient temperature and the temperature of the electronic circuit is greater. If it exceeds a certain threshold, this is therefore an indication of a malfunction of the cooling or heating device. In this variant of the invention, the power P supplied to the circuit can also be taken into account, for example by detecting the instantaneous power P of the circuit and corresponding adaptation of the mentioned Soflbereichs With higher power P, the desired range is again slightly widened, so that an increased blower power, which by the Increasing the power P is justified, yet does not lead to the triggering of an alarm. Accordingly, the target range is somewhat narrowed at lower power P. Al-N2010 / 17500 -28- ternatively, the test can also be triggered with a given (constant) power P.
    5 now shows a somewhat modified arrangement in a control cabinet 14 '. In this case, the blower 18 is arranged on the intake side directly behind the filter 17. In addition, the cooling air is guided in a separate cooling air duct 23 through the control cabinet 14 '. In contrast to the switching cabinet 14 shown in FIG. 2, the control / controller 19 and the monitoring device 20 are integrated in the inverter 1. Finally, the temperature sensor 21 is arranged on the outside of the control cabinet 1 and not in the flow of the cooling air.
    Of course, the features of Fig. 2 and Fig. 5 can be exchanged as desired. For example, the control / controller 19 and / or the monitoring device 20 could also be arranged directly in the inverter 1 according to FIG. 2.
    It would also be conceivable that the fan 18 is arranged in the flow path of the cooling air in front of the filter 17. It would also be conceivable that the filter 17 is arranged on the exhaust side. This is particularly advantageous if the exhaust air is still used for other purposes, such as the temperature of another device, and should be cleaned. Of course, it is also conceivable that a plurality of filters 17 and / or blower 18 are arranged in the control cabinet 14. In particular, the flow profile of the cooling air can also be branched.
    In addition, it is also conceivable that the presented devices are not used for cooling the inverter 1, but for heating a device when it is cooler than the supplied air. For example, an accumulator could be heated to operating temperature.
    The monitoring device 20 may be implemented in software and / or hardware. For example, it may be provided for a microcontroller. Preferably, the monitoring device 20 may also be part of a software of the device to be tempered. N2010 / 17500 -29- * * * * * · * · · · * * * * * * *
    Finally, it is stated that the invention - although it has been explained with reference to an inverter for a solar system and there is advantageous - can of course be used in other cooling / heating devices. In particular, a device according to the invention can also be used in a welding inverter.
    Moreover, the invention is not limited to the use of air as Kühlmedr-um, but can be used in connection with any media, in particular with any gases and liquid media. Instead of cooling air is thus generally a cooling / heating medium with the aid of a fluid energy machine on temperature-controlled device t passed. For example, cooling water can be passed by means of a cooling water pump on the device to be tempered.
    The embodiments show possible embodiments of a cabinet 14, 14 'according to the invention, it being noted at this point that the invention is not limited to the specifically illustrated embodiments thereof, but rather various combinations of the individual embodiments are possible with each other and this variation possibility due to the teaching to technical action by objective invention in the skill of those working in this technical field expert. So are all conceivable embodiments, which are possible by combinations of individual details of the illustrated and described embodiment variant, includes the scope of protection.
    For the sake of order, it should finally be pointed out that for a better understanding of the construction of the control cabinet 14, 14 ', this or its components have been shown partially unevenly and / or enlarged and / or reduced in size. Basically, it is pointed out that the device 1 can be designed as an inverter,
    The task underlying the independent inventive solutions can be taken from the description. N2010 / 17500
    REFERENCE NUMBERS
    inverter
    Input DC-DC converter
    DC
    Output DC-AC converter
    energy
    solar Panels
    network
    consumer
    bus
    control device
    connecting cable
    connecting cable
    operating element
    switch cabinet
    Supply air opening
    Exhaust opening
    filter
    fan
    Control / monitoring monitoring device
    Temperature sensor electronic circuit
    Temperature sensor supply air cooling air duct
    power
    temperature
    Time N2010 / 17500
    权利要求:
    Claims (25)
    [1]
    1. A method for monitoring a cooling or heating device which is used to control the temperature of a device. (C). 1) is provided with an electronic circuit, wherein the cooling or heating device comprises a blower (18) which generates an air stream passing through the device (1) and the electronic circuit, characterized by the steps of: a) transferring the electronic circuit from one b) detecting the temperature (T) of the electronic circuit in the second state of activity, c) checking whether a temporal change of the temperature (T) is outside a predefinable target range and d) triggering an alarm in a second activity state or recognizing such a change for a failure of the cooling or heating device, if the result of the test is positive.
    [2]
    2. The method according to claim 1, characterized in that in addition an ambient temperature is detected and the desired range depends on this.
    [3]
    3. The method according to any one of claims 1 to 2, characterized in that the steps b) to d) are carried out when the ambient temperature and / or the difference between the ambient temperature and the temperature (T) of the electronic circuit and / or one of electronic circuit supplied power (P) at the beginning of the second state of activity is within a predetermined range. N2010 / 17500 -2-
    [4]
    4. The method according to any one of claims 1 to 3, characterized in that in addition a humidity and / or an air density of the air flow is detected and the desired range depends on this.
    [5]
    5. The method according to any one of claims 1 to 4, characterized in that the steps b) to d) are carried out when the air humidity and / or the air density of the air flow is within a predeterminable range.
    [6]
    6. The method according to any one of claims 1 to 5, characterized in that an electrical power (P), which is guided via said electronic circuit, is detected and the steps b) to d) are carried out when a temporal change of power (P) is determined beyond a predefinable threshold.
    [7]
    7. The method according to any one of claims t to 6, characterized in that said power (P) via the energy converter (6) for generating electrical power, which is fed through the electronic circuit, supplied power is determined.
    [8]
    8. The method according to any one of claims 1 to 7, characterized in that step a) is performed by activating or deactivating the electronic circuit.
    [9]
    9. The method according to any one of claims 1 to 8, characterized in that the electronic circuit comprises at least one heat sink for temperature control of at least part of said circuit, the fan (18) generates a heat sink passing airflow and that instead of the electronic circuit only said Circuit part is used for the inventive method, N2010 / 17500
    [10]
    10. The method according to any one of claims 1 to 9, characterized in that step a) by activating a in the circuit, in particular on the heat sink, arranged electrical heating element is executed.
    [11]
    11. The method according to any one of claims 1 to 9, characterized in that step a) by converting an existing in the circuit or formed by the circuit inverter in an operation with adjustable power loss, in particular reactive power operation is performed.
    [12]
    12. The method according to any one of claims 1 to 11, characterized in that a plurality of brine areas can be predetermined, each target area indicates an associated degree of disturbance of the cooling or heating device and wherein the triggered when exceeding a certain target range alarm information about the associated degree contains the disorder.
    [13]
    13. The method according to any one of claims 1 to 12, characterized in that the alarm is transmitted via a mobile network and / or the Internet.
    [14]
    14. The method according to any one of claims 1 to 13, characterized in that an alarm is logged in a memory.
    [15]
    15. The method according to any one of claims 1 to 14, characterized in that in step d) a further examination of the malfunction of the cooling or heating device is performed and only then alarm for a malfunction of the cooling or heating device is triggered when the result of both Exams is positive.
    [16]
    16. The method according to claim 15, characterized in that a power of the blower (18) with increasing deviation between the target and actual temperature of the device (1) is increased and the further examination of the failure of the cooling or heating means the steps: detecting of the performance of the blower (18) characterizing N2010 / 17500 -4- • · > 4 rameters and checking whether the parameter lies outside a predefinable target range (ni_v, nMv, nsv).
    [17]
    17. The method according to claim 15 or 16, characterized in that as the performance of the blower (18) characterizing parameters the voltage applied to a drive motor electrical voltage, the electric current received by a drive motor, the electrical power absorbed by a drive motor, the actual Speed of a drive motor and / or the desired speed of a drive motor is provided.
    [18]
    18. The method according to claim 15, characterized in that a power loss of the device (1) and a performance descriptive parameters of the blower (18) is kept constant and the further examination of the disturbance of the cooling or heating means the steps of: detecting the difference between the ambient temperature and the Temperature of the electronic circuit and checking whether the difference is outside a predetermined target range comprises.
    [19]
    19. Monitoring device (20) for a cooling or heating device, which is provided for tempering a device (1) with an electronic circuit, wherein the cooling or heating device comprises a blower (18), which for generating a device (1 ) and the electronic circuit passing air flow, characterized by a switching device for transferring the electronic circuit from a first to a second state of activity and / or means for detecting such a change, a temperature sensor (21) for detecting the temperature (T) of the electronic Circuit in the second state of activity and N2010 / 17500 -5- v · • * Means to check whether a change in temperature (T) over time is outside a specified target range and to trigger an alarm for a failure of the cooling or heating device, if the result the exam is positive.
    [20]
    20. Switchgear cabinet (14, 14 '), comprising: a device to be tempered (1) with an electronic circuit, a blower (18), which for generating a the control cabinet (14, 14'), the device (1) and the Electronic circuit passing air flow is prepared, characterized by a monitoring device (20) according to claim 19.
    [21]
    21, control cabinet (14, 14) according to claim 20, characterized by a filter (17) in the flow pattern of the air flow.
    [22]
    22. Switchgear cabinet (14, 14 ') according to claim 20 or 21, characterized in that the electronic circuit is at least one heat sink for temperature control of at least part of said circuit comprises the blower (18) is prepared for generating a cooling body passing air flow and the Switching device for transferring said circuit part from a first to a second state of activity is prepared and / or means for detecting such a change are present.
    [23]
    23. Switchgear cabinet (14, 14 ') according to claim 22, characterized in that a temperature sensor (21) is arranged on the at least one heat sink. N2010 / 17500 -6-


    [24]
    24. Switchgear cabinet (14, 14 ') according to any one of claims 20 to 23, characterized in that as an apparatus to be tempered, an inverter (1) is provided.
    [25]
    25. Switchgear cabinet (14, 14 ') according to claim 24, characterized in that the circuit part to be tempered by at least one switching transistor or at least one switching thyristor of the inverter (1) is formed. FRONIUS INTERNATIONAL GmbH

    Lawyers Burger & Partner Attorney at Law N2010 / 17500
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    同族专利:
    公开号 | 公开日
    AT511971A3|2016-02-15|
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    DE102012218190A1|2013-04-11|
    引用文献:
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    法律状态:
    2019-06-15| MM01| Lapse because of not paying annual fees|Effective date: 20181005 |
    优先权:
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    ATA1439/2011A|AT511971B1|2011-10-05|2011-10-05|METHOD FOR MONITORING A COOLING OR HEATING DEVICE AND MONITORING DEVICE THEREFOR|ATA1439/2011A| AT511971B1|2011-10-05|2011-10-05|METHOD FOR MONITORING A COOLING OR HEATING DEVICE AND MONITORING DEVICE THEREFOR|
    DE102012218190A| DE102012218190A1|2011-10-05|2012-10-05|Method for monitoring cooling/heating device of switchgear cabinet, involves triggering alarm for fault in cooling/heating device when time change of temperature of electronic circuit exceeds preset range|
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