mep005 dc breaker poping

[mmri101]

I have a mep005 that starts up but when in comes up to speed the dc circuit breaker trips ,thanks for any help

 

[Ken_86gt]

Is this what you see:
1.You hold the start switch
2.The engines starts
3.You continue to hold the switch until you see voltage, frequency, oil pressure on the gauges
4.You let go of the start switch
5. the DC circuit breaker trips?

Or does it trip prior to seeing the voltage and oil pressure?

 

[mmri101]

it trips before oil pressure comes up or releasing the start switch
thanks

 

[doghead]

I've had this happen(on an MEP-002) when a fuel pump went bad and was causing a short.

Real easy to unplug them and try again, just to eliminate that.

 

[PeterD]

One thing to consider is that perhaps the DC breaker is defective! One test would be to put a DVOM (in current mode) on the breaker and see what the current is when it trips. I've seen this happen in the past where breakers start tripping at lower currents than they are supposed to trip at.