Motor Protection With Temperature Sensor - Siemens SINAMICS G120 Operating Instructions Manual

Advanced commissioning

6.22 Motor protection with temperature sensor

6.22 Motor protection with temperature sensor
The inverter can evaluate one of the following sensors to protect the motor against
overtemperature:
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 inverter cannot detect a motor overtemperature condition.
● Connect the KTY sensor with the correct polarity.
Using a KTY sensor, the inverter monitors the motor temperature and the sensor itself for wire-
break or short-circuit:
● Temperature monitoring:
The inverter 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:
Temperature switch
The inverter interprets a resistance ≥ 100 Ω as being an opened temperature switch and
responds according to the setting for p0610.
316
● KTY84 sensor
● Temperature switch (e.g. bimetallic switch)
● PTC sensor
● Pt1000 sensor
- motor temperature > p0604 and p0610 = 0
The inverter responds with a fault in the following cases:
- motor temperature > p0605
- motor temperature > p0604 and p0610 ≠ 0
The inverter interprets a resistance > 2120 Ω as a wire-break and outputs the alarm
A07015. After 100 milliseconds, the inverter changes to the fault state with F07016.
The inverter interprets a resistance < 50 Ω as a short-circuit and outputs the alarm
A07015. After 100 milliseconds, the inverter changes to the fault state with F07016.
Converter with the CU240B-2 and CU240E-2 Control Units
Operating Instructions, 01/2017, FW V4.7 SP6, A5E34259001B AD