Starting several motors sequentially with a soft starter (cascaded control) [t-head2-pg]

When starting several motors one after the other using a soft starter, keep to the following sequence when changing over:

→ section Control section part 1

Emergency-Stop

S1: Q11 Off

S2: Q11 On

Soft start/soft stop

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.

→ section Control section part 2

Motor 1

Motor 2

Motor n

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.

Cascade [t-head3-ls]

Control section part 1 [t-head3-ls]

Control section part 2 [t-head3-ls]