System Overload. Phase Short?

[jcocn5]

ok  heres my problem.

 

Ive got a GE 8000 series mcc that im installing a fresh magnetic motor starter and circuit breaker in.

 

After running my control circuit via on-board 120vac transformer and checking out all my wiring, I find no faults.

 

My 2hp 3p Delta-Y 60hz motor is installed and terminated.

 

I turn it on and my circuit breaker instantly pops.

 

OK.. so I check phase loss. .  None.

so I check for ground fault.   None.

check for phase short.   None.

check for overload. Tricky because my overload relays are not tripping but the upstream breaker is.

Normally any overload would first be picked up by your heaters. but not this time..

Maged out my motor.   check.

ohm'd out my transformer.     check.

 

Everything looks A-o-K  so why the fuck is my breaker kicking out?

 

 

Any ideas?

John

[DrSithis]

You may need a new power supply. But before you take this in as a opinion and a suggestion that you will do, call up some Tech Support(your local computer hardware/software store) and question it. Explain the problem; and they will question you on several different matters and they will ask you if you've checked for different sorts of things. Did you try a different power cord? Did you try a different outlet or move it to a power bar? Because it is known that if you're running a power bar and you unplug things you can discover it isn't the computer, it is actually your power bar.

 

You're very welcome for the help man.

[jcocn5]

lol.. 3ph deltaY on a pc huh.?  not even close mate.. but thanks anyway

[DrSithis]

It's worth looking over man. It's always something to take into consideration of what you should check. I've had the same issue. It was the power supply box in my desktop. Otherwise you're welcome John.

[Joetorp]

Rooty-toot-toot, it's a 3 phase 480volt motor controller, not computer stuff.  You didn't read what he put down.  You made assumptions.

Joe

[DrSithis]

Ah, misunderstood the entire post. Is the old hardware still available to put back in? If so, try that. If it works with that hardware and if it works, you know it was the new hardware.

 

Sorry for the misconception and ready of the topic Jcocn and Joe.

[Joetorp]

Rooty-toot-toot, once again, it is NOT a computer!!!  John was describing an industrial motor controller.  The solution was to replace a circuit breaker.

Joe

[DrSithis]

Sometimes it takes way too much effort to read a thread correctly. I wasn't making a reference to anything related to the computer that time. I actually googled this "magnetic motor starter."

[Joetorp]

Sometimes it takes way too much effort to read a thread correctly.

I'll remember not to write something important for you to read.