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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.
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