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

Advanced commissioning
6.6 Protection functions
6.6.2

Motor temperature monitoring using a temperature sensor

Connecting the temperature sensor
It is permissible to use one of the following sensors to protect the motor against
overtemperature:
● Temperature switch (e.g. bimetallic switch)
● PTC sensor
● KTY84 sensor
Temperature switch
PTC sensor
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):
234
The converter interprets a resistance ≥ 100 Ω as being an opened temperature
switch and responds according to the setting for p0610.
The converter interprets a resistance > 1650 Ω as being an overtemperature and
responds according to the setting for p0610.
The converter interprets a resistance < 20 Ω as being a short-circuit and responds
with alarm A07015. If the alarm is present for longer than 100 milliseconds, the con-
verter shuts down with fault F07016.
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
Connect the temperature sensor of the motor to terminals
14 and 15 of the inverter.
Operating Instructions, 04/2015, FW V4.7 SP3, A5E34257946B AB
Converter with CU230P-2 Control Units