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Electronic motor starters and drives
Connection examples, DS4
Starting several motors sequentially with a soft starter (cascaded control)

When starting several motors one after the other using a soft starter, keep to the following changeover sequence:
  • Start using soft starter
  • Switch on bypass contactor
  • Disable soft starter
  • Switch soft starter output to the next motor
  • Restart

Emergency-Stop

S1: Q11 Off

S2: Q11 On

 

Soft start/soft stop

Simulation of RUN relay
Timing relay K2T simulates the RUN signal of the DS4. The set off-delay time must be greater than the ramp time. To be on the safe side, use 15 s.

RUN

Off-time monitoring
Set the timing relay K1T so that the soft starter is not thermally overloaded: calculate the time from the soft starter’s permissible operating frequency or select a soft starter that allows the required time to be reached.

Changeover monitoring
Set the timing relay to a return time of about 2 s. This ensures that the next motor branch can not be connected as long as the soft starter is running.

Switching off individual motors

The Off switch results in all motors being switched off at the same time. To switch off individual motors, you need to make use of N/C contact

Observe the thermal load on the soft starter (starting frequency, current load). If motors are to be started at short intervals, you may have to select a soft starter with a higher load cycle.


Soft starters with motor cascade
Klockner Moeller Soft Starter
 
Soft starter with motor cascade, control section part 1
 
Soft starter with motor cascade, control section part 2

Motor 1
Position 2 Motor 2
Position 3 Motor n

 

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