Siemens SINAMICS G120D Operating Instructions Manual page 264

Advanced commissioning
8.20 Motor protection with temperature sensor
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:
Temperature switch
The converter interprets a resistance ≥ 100 Ω as an opened bimetallic switch and responds
according to the setting for p0610.
PTC sensor
The converter interprets a resistance > 1650 Ω as being an overtemperature condition and
responds according to the setting of p0610.
For motors generally equipped with 3 PTC, a minimum resistance value of 20 Ω is required for
short-circuit monitoring for each PTC. If fewer PTC are used in the motors, the total resistance
must be at least 50 Ω.
If the total resistance is below these values, the converter responds with alarm A07015.
If the alarm is present for longer than 100 milliseconds, the converter responds with fault
F07016.
The p4621 parameter can be used enable or disable short-circuit monitoring.
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- 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.
Converter with the control units CU240D-2
Operating Instructions, 10/2020, FW V4.7 SP13, A5E34262100B AH