Siemens SINAMICS G120C Operating Instructions Manual page 222

Advanced commissioning
6.6 Protection functions
KTY84 sensor
NOTICE
Motor overheating due to incorrectly connected KTY sensor
If a KTY sensor is connected with incorrect polarity, the motor can become damaged due to
overheating, as the converter cannot detect a motor overtemperature condition.
• Connect the KTY sensor with the correct polarity.
● Temperature monitoring:
The converter uses a KTY sensor to evaluate the motor temperature in the range from -
48° C ... +248° C.
Use the p0604 or p0605 parameter to set the temperature for the alarm and fault
threshold.
– Overtemperature alarm (A07910):
– Overtemperature fault (F07011):
● Sensor monitoring (A07015 or F07016):
– Wire-break:
– Short-circuit:
218
Using a KTY sensor, the converter monitors the motor temperature and the sensor
itself for wire-break or short-circuit:
- motor temperature > p0604 and p0610 = 0
The converter switches off with fault in the following cases:
- motor temperature > p0605
- motor temperature > p0604 and p0610 ≠ 0
The converter interprets a resistance > 2120 Ω as a wire-break and outputs the alarm
A07015. After 100 milliseconds, the converter changes to the fault state with F07016.
The converter interprets a resistance < 50 Ω as a short-circuit and outputs the alarm
A07015. After 100 milliseconds, the converter changes to the fault state with F07016.
Operating Instructions, 07/2015, FW V4.7 SP3, A5E34263257B AC
SINAMICS G120C converter