Otis drum drivegreenspun.com : LUSENET : Elevator Problem Discussion : One Thread
The Otis drum machine had been modernized in 65(?). It was equipped with an Armor ETS controller and an Imperial 2 speed AC motor. At some point a new brake was installed. We were asked to take on this equipment and the 5 year safety test was due. When a load was placed on the car, the car stalled coming into the floor. We found the TAH relay forced in and TAL disconnected. We repaired TAH and TAL and we now are finding that the motor is pulling too many AMPS.
My question is what is the best way to check for a balanced load? Should I start at 45% of the load and +/- weight until the running amps are the same in both directions? Where else should I be looking? I'm a little frustrated at this point. I would appreciate any comments.
-- Jon (firstname.lastname@example.org), February 21, 2005
Hi Jon, that vintage Armor was Armor out of NY not Louisville KY. Being that old of a job I would get the weights in the car at what you think is balanced and get the car in the middle of the hoistway with having control of the car with only weights in the car and out of service to the public and doors closed and door open disconected try and pick the brake momentaraly and you should be able to rock the brake drum back and forth the same to check for balance car. Probably someone put a new cab on years ago and changed the balance.
-- Jim (email@example.com), February 21, 2005.
this armor control.. has shunts down at the bottom of the controller? you adjust an armor with an empty car level speed consistant both dir. that is if you have the shunts. long bands of metal about 12 to 16 inches long if so the color of the backing plates of the relay red or black.. the armors i have you cannot move the brush rigging on the gen.you adjust them through shunts and also cap dampning at the stop should be 1 bar on the comm back at stopping hope this helps
-- gipp (firstname.lastname@example.org), February 24, 2005.
but as noted 2 speed A C no mg set therefore no brush rigging
-- Dan (email@example.com), February 25, 2005.
Gipp, Dan is right there is no MG set to this system. But I do appreciate your response to my post.
-- Jon (firstname.lastname@example.org), February 25, 2005.
Mod the damn thing and be done with it, if it won't pick the load. it won't pick the load... FAILED TEST....
Are you trying to screw the owners daughter.... what gives... mod the damn thing...
-- Will (email@example.com), February 25, 2005.
I hear what you are saying! I think it would be obvious if I were familiar with the owner’s daughter. We would have the mod job as a locked deal. Thanks for responding it was a good laugh!
-- Jon (firstname.lastname@example.org), February 27, 2005.
Ran into the same situation last week. It is a 1930s freight that was modernized in 1967. A new heavier cab was added. Will not lift load now. I don't that that it ever did since the mod, but it did pass 5 year tests.
In our case, there is no room to add weight in the counterweight frame.
Seems like I saw a rig somewhat like a rope shrtening rig with a scale built into it somewhere. Can't rememeber where though. (Just checked Wurtec)
-- Dan (email@example.com), February 28, 2005.