Tripping Breaker on Wye Delta start
Tripping Breaker on Wye Delta start
(OP)
I have a two motor Baler with two 75hp 460v 3 ph motors with wye delta start. The motors run two piston hydraulic pumps. One motor is tripping the breaker on start. The breakers are a 125 amp breakers, one for each motor. The loaded amps on both of the breakers are 120 amps. Amps to the six delta legs are 63 amps.
There have been only two of these balers made. I have found other engineering errors in the equipment. Is the breaker to small for the motor? What is typical breaker sizing for wye delta start curcuits?





RE: Tripping Breaker on Wye Delta start
Have you read this thread?
http://www.eng-tips.com/viewthread.cfm?qid=321490
Keith Cress
kcress - http://www.flaminsystems.com
RE: Tripping Breaker on Wye Delta start
I read the thread you referred to, after further investigation it appears the motor is tripping after it has started in the bale compression cycle.
( full motor load) One moter pulls 120 amps the other 190 amps. I turned down te pump pressure, Set it by amps to the same as the other motor amps. Let's see what happens!
RE: Tripping Breaker on Wye Delta start
"Dear future generations: Please accept our apologies. We were rolling drunk on petroleum."
— Kilgore Trout (via Kurt Vonnegut)
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RE: Tripping Breaker on Wye Delta start
RE: Tripping Breaker on Wye Delta start
"Dear future generations: Please accept our apologies. We were rolling drunk on petroleum."
— Kilgore Trout (via Kurt Vonnegut)
For the best use of Eng-Tips, please click here -> faq731-376
RE: Tripping Breaker on Wye Delta start