Elevator randomly tripping 200A main breaker

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papaJoe62

New User
Location
Northeast GA
Occupation
Maint. Project Specialist
I have a hydraulic elevator fed from 200a main, to fused disconnect w/150A fuses. 480v, 60 hp motor. Elevator company recently replaced the rails in shaft due to "warping". Since placing elevator back in service, it will run fine for 3-4 days and then randomly trip main breaker. Breaker was replaced but still it trips. Motor is the original 17 year old motor. Electrical contractor says "power is good". Elevator tech say it "must be power". And so it goes.... Thoughts?
 
Can you have someone with a recording type meter monitor it for a few days or until it trips again?
 
Could you also provide us with the breaker and fuse product information? I am interested in seeing the trip curves.

Was any electrical work done during the rail replacement?

When the main breaker trips, is it at a specific position, like ground level and being called to the top floor?

Were all the rails replaced or just a section?

I also agree with Roger, a power monitor could narrow things down.

I am thinking that there has been some settings change that is causing a larger inrush then there previously was.
 
60HP hydraulic, does it have a Wye-Delta starter on that motor? If you are not sure, how many contactors are there for it?
That of course wouldn't immediately address the sudden change, but if they disconnected the motor during that change, they may have reconnected it differently, i.e. "rolled" the phases, and that can make a different in a Wye-Delta situation.
 
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