Motor Protection With Temperature Sensor - Siemens SINAMICS G120C Operating Instructions Manual

Advanced commissioning
8.24 Motor protection with temperature sensor
8.24

Motor protection with temperature sensor

Overview
The converter can evaluate one of the following sensors to protect the motor against
overtemperature:
Function description
KTY84 sensor
NOTICE
Overheating of the motor due to KTY sensor connected with the incorrect polarity
If a KTY sensor is connected with incorrect polarity, the motor can be damaged by overheating,
as the converter cannot detect a motor overtemperature condition.
• Connect the KTY sensor with the correct polarity.
Using a KTY sensor, the converter monitors the motor temperature and the sensor itself for
wire-break or short-circuit:
• Temperature monitoring:
The converter uses a KTY sensor to evaluate the motor temperature in the range from
-48 °C ... +248 °C.
Set the temperature for the alarm and fault thresholds with parameter p0604 or p0605.
– Overtemperature alarm (A07910):
– Overtemperature fault (F07011):
• Sensor monitoring (A07015 or F07016):
– Wire-break:
– Short-circuit:
340
• KTY84 sensor
• Temperature switch (e.g. bimetallic switch)
• PTC sensor
• Pt1000 sensor
- motor temperature > p0604 and p0610 = 0
The converter responds with a 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, 02/2023, FW V4.7 SP14, A5E34263257B AK
SINAMICS G120C Converters