Westinghouse ATM MPG re-leveling

I've got a Westinghouse ATM MPG or MG 10A 11 stop unit that overshoots the floor in the up direction by about 3" and re-levels consistently at all floors. Down direction just misses floor level now and than by about 1/2". Anyone know what might be goin on?

Pez
I'm not familiar with the ATM MPG. Is the car stepping down in speed as it approaches the floors?

Yes. It's stepping down but just passes floor level a little to fast and re levels.

Not familiar with ATM MPG designation either, does it have a regulator/Generator?

Yes, it's a geared DC motor with generator. The motor tag is from 1985.

I'm hearing this unit is an Epoch 1 but don't see it labeled anywhere

If it is an Epoch you need a service tool...

Thanks for responding. We do have the service tool. Ive tried FHU, floor height update seemed to take but no change. Do you know if there are parameters that change slowdown profile or maybe leveling speed? This seems like it will be a simple adjustment but I have no info.

If this is an MG set without tach feedback I'd say it's under compounded but I've never seen one of these controllers either. Is inspect speed close up vs. down?

May wanna look at the DDD board on the governor.

Indirt, haven't checked inspection speed, or contract speed for that matter. We'll check tomorrow.
E-man, I do have extra gov. boards. We'll check that too.
Thanks!

I also seem to recall some negative feedback diodes that would burn up. Westinghouse Schindler had an upgrade to mount some higher current outboard diodes and do away with the small ones.

If I remember correctly there is an adjustment called "acceleration feedback". Been a long time since seeing one but this should control profile. It is a pot on one of the boards.

Does this epoch use optical sensors and reflective tape for leveling? I had some epochs with leveling issues, I replaced the reflective tape and the issues went away.

Pez
Here is what I have in my notes for epoch.
Check POS16 and make sure the car position is hitting the target.
Compare POS16 to AVP16 count. Should be within 4
Check your PE2 boards, you may have a dead zone.
If your confident they are 100%, try adjusting the acceleration feed back board potentiometer MGI R9 ( no more then 2 turns ).
Check your negative feedback
Try changing out MGI or MGA.

Thanks guys! I'll check your suggestions in the next few days.