Siemens SINAMICS G120X - KTY84 Sensor; Motor Protection with Temperature Sensor; Sensor Monitoring; Temperature Monitoring

6.8.3 Motor protection with temperature sensor
Overview
The converter can evaluate one of the following sensors to protect the motor against
overtemperature:
˽
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● KTY84
● Temperature switch (e.g. bimetallic switch)
● PTC
● Pt1000
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● Pt100
Evaluated via a converter analog input
Function description
KTY84 sensor
Using a KTY sensor, the converter monitors the motor temperature in the range -48 °C ...
+248 °C and the sensor itself for wire breakage or short-circuit.
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.
Settings:
● Temperature monitoring:
– Overtemperature alarm (A07910):
- motor temperature > p0604 and p0610 = 0
– Overtemperature fault (F07011):
The converter responds with a fault in the following cases:
- motor temperature > p0605
- motor temperature > p0604 and p0610 > 0
● Sensor monitoring (A07015 or F07016):
– Wire-break:
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.
– Short-circuit:
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
6.8 Drive protection
SINAMICS G120X converter
Operating Instructions, 06/2019, FW V1.01, A5E44751209B AC 409