Karl:
I sure hope you are right. The 2HP is so quite and vibration free that I can't even tell it is running in my small shop. Changing it out would involve a lot of hassle, a new box to hold additional caps, dismantling a very complicated installation and wiring, etc.
The potential relay was suggested in a right up by George Carlson on Metal Web news site. I am assuming it is suitable for most RPC's since they are generally 3HP and higher.
It is Grainger part number 6X550 with these specs:
Potential Relay, Contact Break Current 35 Amps, Coil Drop Out Voltage @ 60 Hz 100-70, Coil Holding Voltage @ 60 Hz 332, Coil Pick Up Voltage @ 60 Hz 166-180, Single Pole, Normally Closed .
The only lighter duty one they sell is 6X549 with the same 35 Amps contact break current but with lighter voltage numbers:
Pick up 139-153
Drop out 55-20
Hold 168
I think I get what pick and drop out designate, but I am not sure about hold.
I think I should try it. Worst thing that happens hopefully would be that it trips out the start circuit too soon and the idler would have trouble starting. Depending on how it behaves, decide if I can live with this system or to switch to a 3HP idler. What do you think?
Thanks to all that have helped out with their suggestions. I really appreciate the guidance.
Shawn  |