Hyd pump motor probs
Hyd pump motor probs
(OP)
The motor is on Y-start/D-run with three contact blocks; One for Y with the leads shorted, this is wired to 10,11, & 12. One for Delta going to 1,2,3. And one for timing out the Y-D blocks. The motor starts but trips the 100A cb @ the 480 panel after the Delta contact block closes. No fuses go. Any ideas what might cause this? I checked the control circuit and all the starter contacts. Next direction should be the connections at the motor, but I'm assuming they're right. The motor was just replaced and hopefully my apprentice electrician got it right. The old wires were U,V,W & X,Y,Z so perhaps it confused him. Any help is appreciated.





RE: Hyd pump motor probs
Gunnar Englund
www.gke.org
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100 % recycled posting: Electrons, ideas, finger-tips have been used over and over again...
RE: Hyd pump motor probs
If there is any mis-connection of the conductors, there are a number of problems. Start here, have your electrician read and understand the proper connections of the motor. http://www.patchn.com/motor_connections.htm
Then look at a typical Y-Delta wiring diagram like this;
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