Star+Delta Control Wiring

May 12, 2020   photos  

You don’t need the indicators, at the most you need a run indicator. Remember it’s only in star for maybe 2 seconds so why bother indicating that. You could drive the run indicator off the delta contractor though as that’s would be an interesting way to do it. In addition, instead of being using the N.O contact #5 of timer for delta A1, you used the auxiliary contact NC of star contactor as its enter lock. If the timer failed you have a problem must be NC/NC interlock both contactor WYE/DELTA. Finally,  Looks like a timed start circuit, switching from star winding service at start, then to delta for running load, on timer make to deactivate first contator first.? I think.