Klockner Moeller Electric Parts from KlocknerMoeller.net

Call Toll Free!

1-877-595-9616

Largest Authorized Stocking USA Distributor Representing

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:

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

Soft starter with motor cascade, control section part 1

Soft starter with motor cascade, control section part 2

Motor 1

Motor 2

Motor n