Motor Components And Options; Motor Components; Thermal Motor Protection - Siemens SIMOTICS M 1PH8 Configuration Manual

Motor components and options

5.1

Motor components

5.1.1

Thermal motor protection

A Pt1000 temperature sensor is integrated in the stator winding to monitor the winding
temperature. The exact type of temperature sensor is stated on the nameplate.
Table 5-1
Type
Resistance when cold (20 °C)
Resistance when hot (100 °C)
Connection
Response temperature
With SH80: Prewarning < 130 °C; Alarm/trip at max. 150 °C ±5 °C
1)
The resistance change is proportional to the winding temperature change. The temperature
characteristic is taken into account in the closed-loop control.
The prewarning signal from the evaluation circuit in the SINAMICS drive converter can be
externally evaluated.
High short-term overload conditions require additional protective measures as a result of the
thermal coupling time of the temperature sensor.
The conductors for the temperature sensor are routed in one cable together with the encoder
conductors.
NOTICE
Destruction of the temperature sensor if the insulation resistance is tested improperly.
If the test voltage is connected to only one temperature sensor terminal, the temperature
sensor will be destroyed.
• Short-circuit the ends of the temperature sensor cables before applying the test voltage.
1PH8 SIMOTICS M main motors
Configuration Manual, 12/2022, A5E51895839A
Features and technical data
1)
Pt1000
Approx. 1090 Ω
Approx. 1390 Ω
Via signal cable
Prewarning < 150 °C
Alarm/trip at max. 170 °C ±5 °C
5
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