Discuss Control Panel Star Delta Starter in the Electrical Wiring, Theories and Regulations area at ElectriciansForums.net
Which is why the uninitiated,can on occasion,open up the panel,and in an effort to "test" or "jog" a troublesome motor,get round to manually poking two contactors at once...and get a fuse time/current demonstration
Screw up the timing and you'll get an almighty bang.
Had a 300kW HPU starter go "boom" on a job because the time between wye & delta was too short - when the delta came in the wye contactor was still arcing which destroyed both contactors - TWICE before the pre-comm guys figured out the problem along with Schneider.
Reply to Control Panel Star Delta Starter in the Electrical Wiring, Theories and Regulations area at ElectriciansForums.net
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