Using a FSQC2390 Cooper Crous-Hinds disconnect interlocked 3 pole 4-wire 480vac 2 HP at Vfd driven aggitator motor what is the best way to
perform the isolation.
!1way is to interlock run enable vfd circuit through 1 set of poles and let vfd perform isolation or 2nd method let disconnect perform by switching all 3 poles.
But I want to ensure that plug is in place to prevent run feedback from showing run when in fact plug is disconnected. Also to prevent drive from starting when plug is inserted and start command is allready in place.
Manual is showing 1st option using a contactor to perform the interlock function. I have a cuttler hammer vfd drive with-out a contactor but a run enable digital input to prevent drive from starting using only 1 set of poles ang passing through the 480vac through FSQC2390.
What NEC codes apply? Thanks.