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#22894 - 02/01/18 02:45 AM
Re: Dover comp nightmare
[Re: MattJ]
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Joined: Nov 2009
Posts: 413
Johnny
Journeyman
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Journeyman
Joined: Nov 2009
Posts: 413
Portland. Oregon
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The switches I was thinking about were the 14 and 15 switches. The core can unscrew and the switches pick up partway and don't make aand break the contacts properly. This throws the compounding out of whack. Also, if the 14 and 15 don't pick at the proper times, you could have the same result. If you don't have motor field, there is a relay that wont let you run at all. If your shunt field is too low, you will drift up, not run up. Has anyone actually witnessed the elevator have this problem? Or are you seeing the end result and not what is actually happening. When it gets to the top floor, does it slow down normally, or does it come in hot. You had said that the problem only exists if it makes a run to the top floor. If it stops at 5, and then continues to 6, the problem doesnt exist?? Put a diode from 6c to 5c, so if someone or something sets up 6, the car will first stop at 5. Before you jump the final, what motion relays are in? When you jump the final, do the motion relays come in or are they already in? Have you checked for continuity on the directional limit when it is on the final? Paper the directional, if it still moves with motion relays, something is shorting into the up motion circuit. It will be interesting to find out what it was.
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#22930 - 02/03/18 03:16 AM
Re: Dover comp nightmare
[Re: MattJ]
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Joined: May 2015
Posts: 71
TC7
journeyman
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journeyman
Joined: May 2015
Posts: 71
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Still brain storming here. I was fighting a problem a while back and found the wire loop going to resistor door would press in the Potter brumfield relays, with resistor door closed, but I think in my case I think it caused the elevator to stall.
I have also heard of shorts in ribbon cable to logic door causing issues like you describe. But keep in mind, these are long shots.
Its also possible that there are pins touching together on the back side of an IBM relay or ribbon cable terminal block. These terminal blocks are tightly packed and located on the logic door and up on the selector. They are labeled A, B , X, Y, etc.. If someone changed a ribbon cable in the past without proper pin removal and insertion tools , it easy to bend the metal portion enough to touch the neighboring conductor, much less easy to miss wire a single conductor on these terminal blocks. I use a non conductive orange peeler stick to make sure that pins that look a little too close aren't actually touching.
I also wonder if it might be worthwhile to swap optical leveling card with another unit. I wouldn't be concerned about level sensors , because that would just cause failure light to turn on. But perhaps an output component on this card is getting stuck on. These are easy to swap.
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