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#27395 - 07/12/19 05:38 AM 1956 Otis relay logic  
Joined: Feb 2018
Posts: 43
Jblack83 Offline
15yr tech
Jblack83  Offline
15yr tech

Joined: Feb 2018
Posts: 43
United States
This is an old lift. Has developed a new problem. In our 35yrs of servicing it, it has never been reocrded on our logs. Or any of our other similar age elevators. Here is the problem.

Down direction only. When called to the 1st landing either by 1C or 1U. The elevator will respond but never goes into high speed. Not a weak coil or shot coil because it works just fine in the up. Tests show no voltage/current flow happening across coil so it is not even trying to come in. This is issue 1.
Issue 2. When it finally gets down to 1st landing it stops about 5ft above the floor on its own. Kicking out all the run relays. But never the call relay. Generator times out and it shuts down. You then give it a call to any of the upper floors and it fires up answers those calls but because of the still latched 1C or 1U it trys to return to 1st landing. And is stuck again. The elevator stops at all other floors just fine , albeit slow in the down direction, except the 1st floor. It won't even run down to floor level on inspection.

The selector is a piano string drum, screw gear vertical carriage with ski's and buttons. I have checked all the ski's and buttons and toned the wiring. All ok.

Have checked top and bottom Hoistway switches. Ok
Have checked leveling switches. Ok
Have checked the car top LU DZ LD old ass giant MAG switches. Ok.

Motor and generator brushes all good. Armature clean copper on both.

Old original resistors, caps, shunts, TR black boxes and relays.

Vintage type that it has the analog voltage meter built into the black asbestos control panel. Sitting IDLE at 120vdc dropping under relay demands and load to around 90vdc..

I have been speculating that Otis coils have a way of causing a voltage drop without actually burning up. Like the older the coil it now needs 130v to work vs the original 110v. Anyway that is side note.

I am running out of ideas. Anyone? I just feel I am missing something.


Jbblack1983@gmail.com
#27396 - 07/12/19 11:28 AM Re: 1956 Otis relay logic [Re: Jblack83]  
Joined: Feb 2013
Posts: 559
john jay Offline
addict
john jay  Offline
addict

Joined: Feb 2013
Posts: 559
ohio
Are the acceleration relays coming in? what is the controller type?

#27397 - 07/12/19 01:01 PM Re: 1956 Otis relay logic [Re: Jblack83]  
Joined: Jan 2014
Posts: 554
Rolly Offline
addict
Rolly  Offline
addict

Joined: Jan 2014
Posts: 554
What is the controller number and wiring diagram on the controller tag? The tag could possibly be on a controller metal cover. Hope it did not get thrown away if it is on a cover.

#27398 - 07/12/19 03:26 PM Re: 1956 Otis relay logic [Re: Jblack83]  
Joined: Feb 2018
Posts: 43
Jblack83 Offline
15yr tech
Jblack83  Offline
15yr tech

Joined: Feb 2018
Posts: 43
United States
Controller number 230832.


Jbblack1983@gmail.com
#27399 - 07/12/19 03:30 PM Re: 1956 Otis relay logic [Re: Jblack83]  
Joined: Feb 2018
Posts: 43
Jblack83 Offline
15yr tech
Jblack83  Offline
15yr tech

Joined: Feb 2018
Posts: 43
United States
We have been using an incomplete print 156363AP. Not having much success.


Jbblack1983@gmail.com
#27400 - 07/12/19 03:40 PM Re: 1956 Otis relay logic [Re: Jblack83]  
Joined: Jan 2014
Posts: 554
Rolly Offline
addict
Rolly  Offline
addict

Joined: Jan 2014
Posts: 554
Type off tag is what you need.

#27401 - 07/12/19 03:51 PM Re: 1956 Otis relay logic [Re: Jblack83]  
Joined: Feb 2018
Posts: 43
Jblack83 Offline
15yr tech
Jblack83  Offline
15yr tech

Joined: Feb 2018
Posts: 43
United States
Serial number 132276
Sales number 230832
Type 20UCL
Wire diagram 1S6363AP


Jbblack1983@gmail.com
#27402 - 07/12/19 04:07 PM Re: 1956 Otis relay logic [Re: Jblack83]  
Joined: Feb 2018
Posts: 43
Jblack83 Offline
15yr tech
Jblack83  Offline
15yr tech

Joined: Feb 2018
Posts: 43
United States
It apears to be related to bad carbon brushes on the motor. Not wearing right. Building up in the comutator groves. We have started re cleaning the holders and posts and we are getting our high speed back now.


Jbblack1983@gmail.com
#27407 - 07/12/19 11:19 PM Re: 1956 Otis relay logic [Re: Jblack83]  
Joined: Feb 2013
Posts: 559
john jay Offline
addict
john jay  Offline
addict

Joined: Feb 2013
Posts: 559
ohio
Good find. you need a 20UCL print. they are pretty easy to come by.

#27410 - 07/13/19 12:03 AM Re: 1956 Otis relay logic [Re: Jblack83]  
Joined: Jul 2013
Posts: 165
NewMech Offline
member
NewMech  Offline
member

Joined: Jul 2013
Posts: 165
A grounded loop circuit will definitely affect your ability to run an empty car down.


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