Siemens SINAMICS G120 CU240E-2 - Motor Temperature Monitoring Using a Temperature Sensor

Functions
7.7 Protection functions
Inverter with CU240B-2 and CU240E-2 Control Units
176 Operating Instructions, 07/2010, FW 4.3.2, A5E02299792B AA
Inverter response
Parameter Description
P0290 Power unit overload response(Factory setting for all Power Modules except for PM260:
2nd factory setting for PM260: 0)
Setting the reaction to a thermal overload of the power unit:
0: Reduce output current (in vector control mode) or speed (in V/f mode)
1: No reduction, shutdown when overload threshold is reached (F30024)
2: Reduce pulse frequency and output current (in vector control mode) or pulse
frequency and speed (in V/f mode)
3: Reduce pulse frequency
P0292 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.
7.7.2 Motor temperature monitoring using a temperature sensor
You can use temperature measurement in the motor to offer the motor thermal protection as
follows:
● with PTC sensor
● KTY 84 sensor
● ThermoClick sensor
The motor's temperature sensor is connected to the Control Unit.
Temperature measurement via PTC
The PTC sensor is connected to terminals 14 and 15.
● Overtemperature: The threshold value to switch over to an alarm or fault is 1650 Ω. After
the PTC responds, alarm A07910 or shutdown with fault F07011 is initiated
corresponding to the setting in p0610.
● Short-circuit monitoring: Resistance values < 20 Ω indicate a temperature sensor short-
circuit
Temperature measurement using KTY 84
The device is connected to terminals 14 (anode) and 15 (cathode) in the forward direction of
the diode. The measured temperature is limited to between -48 °C and +248°C and is made
available for further evaluation.
● When the alarm threshold is reached (set via p0604; factory setting: 130 °C), alarm
A7910 is triggered. Response -> p0610)
● Fault F07011 is output (depending on the setting in p0610) if
– the fault threshold temperature (settable in p0605) is reached
– the alarm threshold temperature (settable in p0604) is reached and is still present after
the delay time as expired.