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Forums13
Topics7,385
Posts40,939
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Most Online3,137
Apr 9th, 2026
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Joined: Jan 2012
Posts: 419
addict
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addict
Joined: Jan 2012
Posts: 419 |
Unsure of your question Uppo?
A and B base refer to dispatching schemes. They are basicall identical, except A base was used mostly on touch button systems, and had multiple diagnostic cards you could plug into the card rack, and B Base was used with regular push buttons, and had one diagnostic board.
Both were based on VIP 260 logic, but transferred from relay form to DTL logic. (DTL = Diode Transistor Logic)
And to confuse things more, there was a CB base. Basically a B base dispatcher, but additonal boards that read flags in the hatch for Selector functions. Basically the 1st Otis that I'm aware of that did not have a mechanical selector.
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Joined: Feb 2013
Posts: 65
journeyman
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journeyman
Joined: Feb 2013
Posts: 65 |
Also check for bent connectors on IBM relay bases as well. I have had those whip my butt on occasion. Peace.
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Joined: Aug 2011
Posts: 563
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addict
Joined: Aug 2011
Posts: 563 |
Unsure of your question Uppo?
A and B base refer to dispatching schemes. They are basicall identical, except A base was used mostly on touch button systems, and had multiple diagnostic cards you could plug into the card rack, and B Base was used with regular push buttons, and had one diagnostic board.
Both were based on VIP 260 logic, but transferred from relay form to DTL logic. (DTL = Diode Transistor Logic)
And to confuse things more, there was a CB base. Basically a B base dispatcher, but additonal boards that read flags in the hatch for Selector functions. Basically the 1st Otis that I'm aware of that did not have a mechanical selector. Thanks broke i think you answered my question. I've worked on the touchbutton control(nightmares they are) feeding multiple cards on the lift no1 selector. I'm pretty sure this was the only high rise type here, with normal button style button types used with a geared machine and selector version for small applications. The next generation of otis lifts were the 401's and no cb base types. I've just read over the time posters stating a or b base and not really sure what they were referring to. Thanks mate.
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Joined: Jan 2012
Posts: 419
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Joined: Jan 2012
Posts: 419 |
Ah....Touch Buttons and Balanced Bridge detectors...The good old days..  One of my first few days on the job, 35 years ago, my boss tells me.. "That tenite cover is loose over the door detector. Reach in behind it and tighten it up".. Let's just say that 1000 cycle wouldn't kill you but it would make you hurt yourself trying to get away from you.. Of course he thought it was hilarious. Different times for sure.. 
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Joined: Aug 2011
Posts: 563
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Joined: Aug 2011
Posts: 563 |
Ah....Touch Buttons and Balanced Bridge detectors...The good old days.. One of my first few days on the job, 35 years ago, my boss tells me.. "That tenite cover is loose over the door detector. Reach in behind it and tighten it up".. Let's just say that 1000 cycle wouldn't kill you but it would make you hurt yourself trying to get away from you.. Of course he thought it was hilarious. Different times for sure.. ha i know what you mean. Touch buttons, saturable reactors on the pdo, old lambda with the high frequency were all stuff we, as newish mechanics freshly bought out by Otis all had to learn let alone fricken selectors that our company had p****d off 20 years earlier! And those old pranksters soon realised not to piss us off as we fight back. 
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Joined: Feb 2013
Posts: 4
stranger
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stranger
Joined: Feb 2013
Posts: 4 |
Sounds like LSP isn't picking and locking out leveling. Look there.
Stay safe.
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Joined: Feb 2013
Posts: 4
stranger
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stranger
Joined: Feb 2013
Posts: 4 |
Sounds like LSP isn't picking and locking out leveling. Look there.
Stay safe.
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Joined: Nov 2013
Posts: 23
stranger
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stranger
Joined: Nov 2013
Posts: 23 |
One year later, I hope you found your problem, he-he. But I think as stated, UA and DA are respectively held in by SU and SD contacts I think. So, if SU or SD are dropping out for some reason, that would cause UA or DA to drop out hence allowing CS to come in and the car then relevels. So, check all contacts in the SU and SD circuits. Wish I had some prints. peace-out.
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Joined: Apr 2013
Posts: 17
stranger
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stranger
Joined: Apr 2013
Posts: 17 |
Problem with the Yellow Jacket relays is that the solder connections on the back of the relay can touch the contacts in the wire contact relay base. This can short circuits together not meant to be. I personally have been involved in trouble shooting three such occurances, twice while at Dover and once after leaving. All were documented, the first two bothto Dover and to World and the third to Works and Otis. No once seemed concerned. Best replacement is a new relay from Vertex and they aren't expensive.
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Joined: May 2012
Posts: 194
member
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member
Joined: May 2012
Posts: 194 |
.....the Vip260 is also gearless umv control system..had many of those cars in one building...the Test card in the operational controller slot YK..was a worth its weight in gold..
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Joined: Nov 2013
Posts: 23
stranger
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stranger
Joined: Nov 2013
Posts: 23 |
And another thing, I'm sorry to read that you young guys haven't learned what us old farts found out a long time ago. Those yellow jacket relays are crap. Just because they have an "led" on the front, everyone thinks they must be great. Well, they're not. Put in the relay that the base was made for guys. And like I said, you have to maintain SU and SD once you pick MO, or you're going to stop and relevel.
Last edited by mjm; 11/05/13 03:57 AM.
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Joined: Jun 2013
Posts: 72
journeyman
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journeyman
Joined: Jun 2013
Posts: 72 |
^^^^^^^^👍👍👍👍👍👍👍👍👍
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Joined: Aug 2011
Posts: 563
addict
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addict
Joined: Aug 2011
Posts: 563 |
.....the Vip260 is also gearless umv control system..had many of those cars in one building...the Test card in the operational controller slot YK..was a worth its weight in gold.. Yeah most of the vip 260's I worked on was gearless at around 30 floors.
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Joined: Apr 2020
Posts: 520 Likes: 2
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Joined: Apr 2020
Posts: 520 Likes: 2 |
Aqua, could you please email me the composite adjusters manual? [email protected] Thanks so much, Montana
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Joined: Oct 2017
Posts: 7
stranger
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stranger
Joined: Oct 2017
Posts: 7 |
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Joined: Oct 2017
Posts: 7
stranger
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stranger
Joined: Oct 2017
Posts: 7 |
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Joined: Aug 2017
Posts: 579 Likes: 6
addict
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addict
Joined: Aug 2017
Posts: 579 Likes: 6 |
Could you send me a copy as well? Thanks
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Joined: Apr 2021
Posts: 2
stranger
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stranger
Joined: Apr 2021
Posts: 2 |
Still have manual by chance ?? [email protected]
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HW PM
by Chris, January 13
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