Connection examples, DM4 - Starting several motors sequentially with a soft starter

Starting several motors sequentially with a soft starter [t-head1-pg]

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

Start using soft starter

Switch on bypass contactor

Block soft starter

Switch soft starter output to the next motor

Restart




Emergency-Stop S1: Off S2: On Enable Soft start/Soft stop	Set the timing relay so that the soft starter is not thermally overloaded. The appropriate time relates to the admissible operating frequency of the selected soft starter. Alternatively, select the soft starter so that the required times can be attained. 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. N/C contact S1 switches all motors off at the same time. To switch off motors individually, you need to make use of N/C contact S3.