7 Connection examples7.3 Size 3 and 4 (41 – 200 A)DS7 Soft starter 09/16 MN03901001Z-EN www.eaton.com 1417.3.8 Starting several motors sequentially with a soft starterIf 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 thermalload of the soft starter (starting frequency, current load) must betaken into account.If the starts occur closely in succession, the soft starter must bedimensioned larger (i.e. the soft starter must be designed withan accordingly higher load cycle).￫ Due to the thermal design of the DS7 soft starters, werecommend the use of an (optional) fan when using a DS7series device for starting several motors.
