Home Forums General Discussion Technical Questions Old Thompson controller

Working on a very old Thompson Controller. Elevator goes into leveling, relays C1, C2, C3..... Drop out, unit hits final leveling and the motor stalls out. field voltage drops to 26vdc and resistors turn cherry red. Don't have a print, have checked for mechanical binds, seems ok.....unit seems worse in the down direction, runs a bit faster in up. No generator on this job, DC supplied to disconnect from rectifier in basement of building....very old set up. Unit has run ok for 8 years, that I have had it. Any thoughts?

MCE bought out O Thompson. They may still have prints for your job. Try the following people they may still be there!
Jorge Cruz
Robert Honeyman
Roberto Valaguera

East Coast (718)417-3131

Electrodyne is a place to check for prints-they probably have a set

There is some documentation available on MCE's web site as well...

Cheak your Capacitor in line with the Resistors. It could be a open Resistor. Is this the one with a couple of solid boards labeled S1-S5 about chest height? you have one with several pot switches on it, one of those is a leveling final speed (I think it is K speed, but dont quote me).Try swapping the board s with the other car, it might ride a little funny, but see if it levels? I don't know what model you have, but that might help. Good luck. I am going to finish my beer now.