Motor Temperature Monitoring Using A Temperature Sensor - Siemens SINAMICS G120 Operating Instructions Manual

Functions
7.7 Protection functions
7.7.2

Motor temperature monitoring using a temperature sensor

You can use one of the following sensors to protect the motor against overtemperature:
● 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
● Short-circuit monitoring: Resistance values < 20 Ω indicate a temperature sensor short-
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
● Fault F07011 is output (depending on the setting in p0610) if
Wire-break and short-circuit monitoring via KTY 84
● Wire break: Resistance value > 2120 Ω
● Short circuit: Resistance value < 50 Ω
As soon as a resistance outside this range is measured, A07015 "Alarm temperature sensor
fault" is activated and after the delay time expires, F07016 "Motor temperature sensor fault"
is output.
Temperature monitoring via ThermoClick sensor
The ThermoClick sensor responds at values ≥100 Ω. After the ThermoClick sensors has
responded, either alarm A07910 or shutdown with fault F07011 is initiated corresponding to
the setting in p0610.
176
the PTC responds, alarm A07910 or shutdown with fault F07011 is initiated
corresponding to the setting in p0610.
circuit
A7910 is triggered. Response -> p0610)
– 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.
Inverter with CU240B-2 and CU240E-2 Control Units
Operating Instructions, 01/2011, FW 4.4, A5E02299792B AB