I am working on a MEP-805B and am having trouble with the circuit interrupter. The contactor is not getting its 24V to the coil from the circuit interrupter switch. I jumpered 24V from the switch directly to the coil and it is closing correctly. I’m having trouble finding a good schematic to trace where my wire goes after leaving the switch and before it gets to the coil. Thanks in advance.
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MEP-805B Circuit Interrupter Not Closing
- Thread starter Mrekieta
- Start date
- 16,755
- 24,065
- 113
- Location
- Burgkunstadt, Germany
Have you down loaded the TM's and schematics? There is no "good schematic" . What's in the TM's is what you get. Is this set new to you? Have you ever seen it work tight?
Yes sir, I’ve looked at the schematic that shows the 24V close command comes from the board on the backplane. It leads me to think that the board is possibly bad. Yes it is a new set to me and no I have never seen the contactor work like it should.
- 1,178
- 389
- 83
- Location
- Guymon, OK
I wouldnt say a backplane is bad unless it is damaged.... i would remove the command coupla, disassemble, clean inspect, assemble then go test again.
i had a red headed step child 805b that was..... difficult, throw faults, wouldnt run, finallyremoved everything from backplane, looked at it, put itback together..... now its most reliable that i own
i had a red headed step child 805b that was..... difficult, throw faults, wouldnt run, finallyremoved everything from backplane, looked at it, put itback together..... now its most reliable that i own
- 1,178
- 389
- 83
- Location
- Guymon, OK
#2 MEP 805B oh the joys
Look at the schematic, and then find wire T-1, (L-1) T-2, (L-2) and T-3, (L-3). They come directly from the G-1, (main generator) to the TB-1. From there they go directly to CB-1. Wire T-0 goes from the G-1 to TB-1, connection, (Post) number 10. Measure from connection 10 to the three phases...
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