Inverter Protection Using Temperature Monitoring - Siemens SIMATIC ET 200pro Series Operating Instructions Manual

Advanced commissioning

7.14 Inverter protection using temperature monitoring

7.14 Inverter protection using temperature monitoring
The inverter temperature is essentially defined by the following effects:
● The ambient temperature
● The ohmic losses increasing with the output current
● Switching losses increasing with the pulse frequency
Monitoring types
The inverter monitors its temperature using the following monitoring types:
● I
● Measuring the chip temperature of the Power Module (alarm A05006, fault F30024)
● Measuring the heat sink temperature of the Power Module (alarm A05000, fault F30004)
Inverter response to thermal overload
Parameter Description
r0036
r0037
p0290
p0292
p0294
Overload response for p0290 = 0
The inverter responds depending on the control mode that has been set:
● In vector control, the inverter reduces the output current.
● In U/f control, the inverter reduces the speed.
Once the overload condition has been removed, the inverter re-enables the output current or
speed.
162
t monitoring (alarm A07805, fault F30005)
2
Power unit overload I
The I t monitoring calculates the inverter utilization based on a current reference value
2
defined in the factory.
Actual current > reference value: r0036 becomes higher.
•
Actual current < reference value: r0036 becomes lower or remains = 0.
•
Power unit temperatures [°C]
Power unit overload response
Factory setting and the ability to be changed depends on the hardware. The dependency
is described in the List Manual.
A thermal overload is present if the inverter temperature is greater than that specified in
p0292.
You define how the inverter responds if there is a risk of thermal overload using this
parameter. The details are described below.
Power unit temperature warning threshold (factory setting: Heat sink [0] 5 °C, power
semiconductor [1] 15 °C)
The value is set as a difference to the shutdown temperature.
Power unit warning at I2t overload (factory setting: 95 %)
t [%]
2
Operating Instructions, 09/2017, FW V4.7 SP9, A5E34257324B AE
SIMATIC ET 200pro FC-2 converter