motor failure

[bepco1]

This the second time we lost a 3hp 3phase motor of ss unit during power failure.
Seems that one leg of electtric company line was down and some one came to use wash. they called when it wouldnt work and when we arrived the work room was full of smoke.
1st time i fought with elec co, they said failure due to mother nature during storm.
@ time iam waiting to hear back, this time i met crew on road they told me there a blown fuse.
is there anything i can install on motor so it wont try to start if one phase is out
alan

 

[I.B. Washincars]

Our motors have an overload after the contactor which trips when a leg is lost. I've had it happen 5 or 6 times at one wash and never any damage.

 

[Jim Caudill]

There are a number of ways to skin this cat, here is a link to one:
http://www.phaselossprotection.com/

Basically what you want to do is detect the loss of one or more of your 3 phases. When a loss is detected, you need to shutdown your feed from the control transformer. In my case that would be eliminating the 24vac feed that goes to the bays as well as the motor contactors.

 

[bepco1]

Our motors have an overload after the contactor which trips when a leg is lost. I've had it happen 5 or 6 times at one wash and never any damage.

could you tell us part number
sounds like would work for us
alan

 

[pitzerwm]

I had that system, 3 relays one on each leg, if any went down, it killed all low voltage, so no equipment could start. It also called my cell phone.

 

[Jim Caudill]

Alan, going Pat's route would protect your motors, but could result in some PO'd customers. Why let someone put their money in, if the pump ain't gonna' work.

 

[bepco1]

Alan, going Pat's route would protect your motors, but could result in some PO'd customers. Why let someone put their money in, if the pump ain't gonna' work.

i check out site and will call the in am
i think it bothers me more than it does customers
thank you
alan

 

[I.B. Washincars]

Alan, going Pat's route would protect your motors, but could result in some PO'd customers. Why let someone put their money in, if the pump ain't gonna' work.

Jim is right, it does irritate customers when the overload is tripped since they can't rinse off their tire cleaner, PS, or whatever they sprayed on. My equipment came this way from the factory (Mark VII & Magic Wand). If I don't forget, I'll try to snap a pic of one of mine.

Now Jim has got me to thinking. My contactors have an unused NO & NC leg. I may see if I can use one to kill the 24V so the bay won't accept money if the overload is tripped.

 

[MEP001]

Alan, going Pat's route would protect your motors, but could result in some PO'd customers. Why let someone put their money in, if the pump ain't gonna' work.

That's why you use the thermal overload to kill the power to the bay and not just break the 24V to the coil. You won't have more than one PO's customer, and for $30 it protects the motor.