Functions
7.4 Motor protection
SIRIUS 3RW55 soft starter
112 Manual, 08/2018, A5E35630887002A/RS-AB/002
Thermistor motor protection with temperature sensor
Operating principle
The temperature sensor of a motor can be connected to the soft starter and evaluated. If a
specific motor-dependent temperature is exceeded, the soft starter recognizes this and
reacts accordingly. You can set the reaction. The sensor cables can be monitored for
open-circuit and short-circuit.
Two different types of measuring sensor can be connected to the soft starter:
● PTC thermistors type A
● Thermoclick
You will find more information on the connection of the temperature sensor in Chapter
Connecting the temperature sensor (Page 210).
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