Siemens SINAMICS G120 Operating Instructions Manual page 198

Functions
9.7 Protection functions
KTY84 sensor
CAUTION
Ensure the correct polarity when connecting the KTY sensor:
If a KTY sensor sensor is connected with the incorrect polarity, this can destroy the motor
due to overheating, as the inverter cannot detect a motor overtemperature condition.
The inverter evaluates the KTY sensor as follows:
● Temperature measurement:
● Overtemperature alarm (A07910):
● Overtemperature fault (F07011):
● Alarm and fault, sensor monitoring (A07015 or F07016):
196
The inverter determines the motor temperature in the range from -48 °C ... +248 °C.
The inverter signals an alarm for a motor temperature > p0604.
The inverter signals a fault in the following cases:
– Always for a motor temperature > p0605.
– In addition, for a motor temperature > p0604, if p0610 = 1 or p0610 = 2.
– Wire-break:
The inverter interprets a resistance > 2120 Ω as a wire break.
– Short-circuit:
The inverter interprets a resistance < 50 Ω as short-circuit.
– The inverter responds to a wire break or short circuit with an alarm. If the alarm is
present longer than 100 milliseconds, then this is followed by a fault.
SINAMICS G120C frequency converter
Operating Instructions, 03/2012, FW V4.5, A5E02999804B AB