Starting Several Motors Sequentially With A Soft Starter - Eaton DS7 Manual

7.3.8 Starting several motors sequentially with a soft starter

If you will be starting several motors one after the other with a single soft starter,
make sure to follow the changeover sequence below:
▶1. Start using soft starter
▶2. Switch on bypass contactor Qn2 via TOR
▶3. Disable soft starter
▶4. Switch soft starter output with Qn1 to the next motor
▶5. Restart
￫
When starting several motors with one soft starter the thermal
load of the soft starter (starting frequency, current load) must be
taken into account.
If the starts occur closely in succession, the soft starter must be
dimensioned larger (i.e. the soft starter must be designed with
an accordingly higher load cycle).
￫
Due to the thermal design of the DS7 soft starters, we
recommend the use of an (optional) fan when using a DS7
series device for starting several motors.
DS7 Soft starter 09/16 MN03901001Z-EN www.eaton.com
7 Connection examples
7.3 Size 3 and 4 (41 – 200 A)
141