Temperature Sensor Evaluation - Siemens SINAMICS S120 Function Manual

Monitoring and protective functions
9.5 Thermal motor protection
9.5.11

Temperature sensor evaluation

Temperature measurement via KTY or PT100
● When the alarm threshold p0604 is exceeded, alarm A07910 is output.
For vector control, using parameter p0610, you can set the drive response when the
alarm is initiated:
– 0: No response, alarm only A07910, no reduction of I_max
– 1: Alarm A07910 and fault F07011, reduction of I_max
– 2: Alarm A07910 and fault F07011, no reduction of I_max
● When the fault threshold is reached (set via p0605, factory setting = 145 °C), fault
F07011 is triggered in conjunction with the setting in p0610.
Temperature measurement via PTC
● Alarm A07910 is triggered once the PTC responds
● Fault F07011 is triggered once the waiting time defined in p0606 has elapsed
Sensor monitoring for wire breakage/short-circuit
● A sensor monitoring function for a short-circuit in the sensor cable is possible for a PTC
and a KTY84 . Wire break monitoring is possible for a KTY84 sensor:
If the temperature value lies outside the specified range of -140 °C ... +250 °C, then it is
probable that the sensor cable either has a broken wire or short-circuit. The alarm
A07015 "Drive: Motor temperature sensor alarm" is initiated. After the wait time in p0607
has expired, fault F07016 "Drive: Motor temperature sensor fault" is output.
● If an induction motor is connected, you can suppress fault F07016 by setting p0607 = 0.
The drive then continues to operate with the data calculated in the thermal 3-mass model.
● If the motor temperature sensor set in p0600 is not connected, alarm A07820
"Temperature sensor not connected" is triggered.
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Function Manual, (FH1), 04/2014, 6SL3097-4AB00-0BP4
Drive functions