Siemens SINAMICS S120 Function Manual page 296

Monitoring and protective functions
8.5 Thermal motor protection
Temperature measurement via KTY
The device is connected to terminals X522:7 (anode) and X522:8 (cathode) at the customer
terminal block (TM31) in the diode conducting direction. The measured temperature is
limited to between -48 °C and +248°C and is made available for further evaluation.
● Set the KTY temperature sensor type: p0601 = 2
● Activate motor temperature measurement via the external sensor: p0600 = 10
● When the alarm threshold is reached (set via p0604; factory setting: 120°C), alarm A7910
● When the fault threshold is reached (set via p0605), fault F07011 is triggered in
Temperature measurement via PTC
The device is connected to terminal X522:7/8 on the Terminal Module (TM31). The threshold
for switching to an alarm or fault is 1650 Ω. If the threshold is exceeded, the system switches
internally from an artificially-generated temperature value of -50 °C to +250°C and makes it
available for further evaluation.
● Set the PTC temperature sensor type: p0601 = 1
● Activate motor temperature measurement via the external sensor: p0600 = 10
● Alarm A07910 is triggered once the PTC responds.
● Fault F07011 is triggered once the waiting time defined in p0606 has elapsed.
Sensor monitoring for cable breakage / short-circuit
If the temperature of the motor temperature monitor is outside the range -50°C to +250°C,
the sensor cable is broken or has short-circuited. Alarm A07915 ("Alarm: temperature sensor
fault") is triggered. Fault F07016 ("Fault: temperature sensor fault") is triggered once the
waiting time defined in p0607 has elapsed.
Fault F07016 can be suppressed by p0607 = 0. If an induction motor is connected, the drive
continues operating with the data calculated in the thermal motor model.
If the system detects that the motor temperature sensor set in p0600 is not connected, alarm
A07820 ("Temperature sensor not connected") is triggered.
Function diagrams for thermal motor protection
● 8016 Thermal monitoring motor
● 9576 Temperature evaluation KTY/PTC
● 9577 Sensor monitoring KTY/PTC
296
is triggered.
Parameter p0610 can be used to set how the drive responds to the alarm triggered:
– 0: No response, only alarm, no reduction of I_max
– 1: Alarm and reduction of I_max and fault (F07011)
– 2: Alarm and fault (F07011), no reduction of I_max
conjunction with the setting in p0610.
Function Manual, (FH1), 07/2007 Edition, 6SL3097-2AB00-0BP4
Drive Functions