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#26495 - 04/10/19 06:08 PM Dover Composite Issue  
Joined: May 2015
Posts: 161
wltr00 Offline
member
wltr00  Offline
member

Joined: May 2015
Posts: 161
I've got a Composite with the Stop Switch in and on INSP, yet when power is applied the car takes off in the down direction and goes to the Pit. It's like it's pushing the motor through the brake. It is 12.5 KW motor with Optical leveling. I replaced the Generator brushes and blew out the Generator, but it is still happening. I have checked the 14/15 Contactors. Anyone ever seen anything like this?

#26496 - 04/10/19 06:33 PM Re: Dover Composite Issue [Re: wltr00]  
Joined: Feb 2013
Posts: 590
john jay Offline
addict
john jay  Offline
addict

Joined: Feb 2013
Posts: 590
ohio
If it going down on the final without pulling the directional relays in, it almost has to be a series field issue.

#26499 - 04/10/19 11:34 PM Re: Dover Composite Issue [Re: wltr00]  
Joined: Nov 2009
Posts: 255
Johnny Offline
Journeyman
Johnny  Offline
Journeyman

Joined: Nov 2009
Posts: 255
Portland. Oregon
Suicide circuit open Replace BR relay and possibility BRT timer

#26500 - 04/10/19 11:37 PM Re: Dover Composite Issue [Re: wltr00]  
Joined: Nov 2009
Posts: 255
Johnny Offline
Journeyman
Johnny  Offline
Journeyman

Joined: Nov 2009
Posts: 255
Portland. Oregon
Got prints??? From A2 thru BR 7-1 thru Gen Shunt field to A1. This kills the shunt field

#26501 - 04/10/19 11:45 PM Re: Dover Composite Issue [Re: wltr00]  
Joined: Jul 2013
Posts: 175
NewMech Offline
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NewMech  Offline
member

Joined: Jul 2013
Posts: 175
Back contacts on BR not allowing proper operation of suicide circuit. Meter between two adjacent MG brushes, the generator is probably building an output with no demand.

#26505 - 04/11/19 03:02 AM Re: Dover Composite Issue [Re: wltr00]  
Joined: May 2015
Posts: 53
TC7 Offline
journeyman
TC7  Offline
journeyman

Joined: May 2015
Posts: 53
I know this is a long shot, but is the MG set spinning the right direction?

Was it doing this before you blew it out?

Did you go back with the same brushes than were in it previously?

Was there perhaps previous work being done to this unit or was this in response to a call back where you found this previously running unit in this condition?

It sounds like way too much series field.


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