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#33919 - 09/21/22 03:06 PM Otis schematic symbol  
Joined: Jan 2012
Posts: 9
Lev Offline
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Lev  Offline
stranger

Joined: Jan 2012
Posts: 9
Dear all
I have attached a screeshot with marking. Can anyone tell me the meaning of it.

Regards
Levo

Attached Files
#33938 - 09/23/22 09:03 PM Re: Otis schematic symbol [Re: Lev]  
Joined: Jul 2022
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LAmech Offline
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LAmech  Offline
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Not an Otis guy, but I'm thinking it's a variable capacitor or [i]maybe[i] a MOV. It's the only option that makes sense and not to far off from the modern symbol.

It shouldn't be to hard to figure out from looking at the full print or controller though.

Last edited by LAmech; 09/23/22 09:05 PM.
#33939 - 09/23/22 10:43 PM Re: Otis schematic symbol [Re: Lev]  
Joined: Feb 2013
Posts: 690
john jay Offline
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john jay  Offline
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Joined: Feb 2013
Posts: 690
ohio
It is a Dog shaft switch. Under the car, on the pull-out safeties shaft. A switch that has to be manually reset.

#33941 - 09/24/22 02:27 AM Re: Otis schematic symbol [Re: LAmech]  
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Lev Offline
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Lev  Offline
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Joined: Jan 2012
Posts: 9
Dear LAmech,
This symbol shown across the normally close contact.
Regards
Lev

#33942 - 09/24/22 07:31 AM Re: Otis schematic symbol [Re: Lev]  
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LAmech Offline
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LAmech  Offline
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Yes, a capacitor across a contact will prevent an arc from forming when the contact begins to open, especially when there's an inductive load like a motor on the other end. Normally there's a resistor in series so the cap doesn't discharge as the contact closes and cause another arc. But if the power is cut from the relay, and the load discharges the cap before the relay drops, then I don't think you would need a resistor at all. And it being a variable variety would allow the mechanic to adjust it in the field until the arc is no longer seen instead of measures and doing math and ordering the needed size.

https://www.te.com/commerce/Documen...36_AppNote&DocType=CS&DocLang=EN the last page of this pamphlet describes what i'm talking about.

Not sure if this is the correct answer, just what I see when I look at the print.

#33944 - 09/24/22 02:47 PM Re: Otis schematic symbol [Re: Lev]  
Joined: Jan 2012
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Lev Offline
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Lev  Offline
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Joined: Jan 2012
Posts: 9
Dear LAmech,
Yes. This is possibly a varistor. Thanks for your input.

Regards
Levo

#34278 - 11/27/22 10:41 PM Re: Otis schematic symbol [Re: Lev]  
Joined: Feb 2012
Posts: 80
NY Guy Offline
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NY Guy  Offline
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Joined: Feb 2012
Posts: 80
I agree to this being a Varistor type component. Could be used as a suppressor or surge protection.


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