Monitoring of motor winding

DANGER

danger

Risk of explosion due to overheating of the motor!

If the temperature limiter is connected incorrectly, there is a risk of explosion due to overheating of the motor! Always connect the temperature limiter to a manual reactivation lock. This means that a “release button” must be manually activated!

The installed sensor specifies the trigger temperature as part of thermal motor monitoring. 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 with anti-reactivation lock 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 anti-reactivation lock!
  • CAUTION! Motor damage due to overheating! In the event of automatic reactivation, comply with the specifications for the maximum switching frequency and switching break!

Connection of the thermal motor monitoring

  • Connect the bimetallic strip using an evaluation relay. "CM-MSS" relay is recommended for this purpose.
  • Connection values: max. 250 V(AC), 2.5 A, cos φ = 1
  • Connect the PTC sensor via an evaluation relay. "CM-MSS" relay is recommended for this purpose.
  • If a frequency converter is used, connect the temperature sensor at the Safe Torque Off (STO). Deactivation on hardware side is thus ensured.