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30 VLT ® Soft Starter Pocket Guide
Motors in parallel
For two motors or more in parallel, the soft starter FLC must be
appropriate for the combined motor FLCs and each motor must have
separate overload protection.
A parallel starting installation requires careful attention to soft starter
selection.
If the motors are the same size and are mechanically
coupled, a current limit soft starter can be used. MCD202
and MCD3000 soft starters provide current limit starting and
can be used to parallel start motors which are the same size
and mechanically coupled.
If the motors are diff erent sizes and/or the loads are not
mechanically interlocked, a soft starter with a timed
voltage ramp (TVR) start profi le should be used. MCD 201
soft starters provide TVR starting and are designed for
use with external motor protection devices. They are ideal
for starting motors which are not the same size or are not
mechanically coupled.
Multiple Motors: Can one soft starter be used
to control multiple motors?