Monitoring of motor winding
With bimetallic strips
Connect the bimetallic strips directly to the switchgear or via an evaluation relay.
Connection values: max. 250 V (AC), 2.5 A, cos φ = 1
Wiring diagram for bimetallic strip | |
|---|---|
Temperature limiter | |
20, 21 | Bimetallic strip connection |
Temperature controller and limiter | |
21 | High temperature connection |
20 | Centre terminal |
22 | Low temperature connection |
With PTC sensor
Connect the PTC sensor via an evaluation relay. "CM-MSS" relay is recommended for this purpose.
PTC sensor wiring diagram | |
|---|---|
Temperature limiter | |
10, 11 | PTC sensor connection |
Temperature controller and limiter | |
11 | High temperature connection |
10 | Centre terminal |
12 | Low temperature connection |
Trigger status for temperature controller and limiter
The installed sensor specifies the trigger temperature as part of thermal motor monitoring using bimetallic or PTC sensors. Depending on the thermal motor monitoring version, the following triggering status must occur when the trigger temperature is reached:
- Temperature limiter (1 temperature circuit):
- The unit must be deactivated once the trigger temperature has been reached.
- Temperature controller and limiter (2 temperature circuits):
- Once the trigger temperature for the low temperature is reached, the motor can deactivate with automatic reactivation. Upon reaching the trigger temperature for the high temperature limit, the motor must deactivate with manual reactivation.
Note the additional information in the section on potentially explosive areas described in the appendix!