Motor Protection With Temperature Sensor; Kty84 Sensor; Temperature Monitoring; Sensor Monitoring - Siemens SINAMICS G120XA Operating Instructions Manual

6.7.3

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:
SINAMICS G120XA converter
Operating Instructions, 03/2019, FW V1.0, A5E44751205B AB
● 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.
Advanced commissioning
6.7 Drive protection
305