Internal temperature switch -T

If a BW...-T braking resistor with internal temperature switch is used, there are 3 possible connections.

Connection 1

Connection 2

Connection 3

[1]

Line contactor

[2]

Braking resistor

  • Connection 1
    • If the thermal circuit breaker trips, the signal in the power supply module is evaluated.
    • This does not require a response by the PLC.
    • It is not required to disconnect the supply system connection with an external switching device.
    • If the thermal circuit breaker trips, the power supply module switches all axis modules to "Output stage inhibited".
  • Connection 2
    • If the thermal circuit breaker trips, the signal is evaluated only in the PLC.
    • If the thermal circuit breaker trips, the PLC must interrupt the power supply.
    • If the thermal circuit breaker trips, there is no response in the power supply module and the axis modules.
    • With connection 2, it is possible that the PLC finishes the current travel cycle although the thermal circuit breaker has tripped. Only then is the power supply disconnected. In this case, the residual braking energy WRest = PBRnom × 20 s must not be exceeded.
  • Connection 3
    • If the thermal circuit breaker trips, the signal directly affects the line contactor.
    • This does not require a response by the PLC.
    • If the thermal circuit breaker trips, there is no direct response in the application inverter.