Author Topic: Bi-Directional DC Relay Contactor and Auxilkiary contact failure  (Read 2119 times)

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Offline wjmuss10Topic starter

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Bi-Directional DC Relay Contactor and Auxilkiary contact failure
« on: November 08, 2023, 02:19:46 am »
Looking for help figuring out why my Normally Open Aux contact will randomly not close even when my DC coil is energized and the contactor closes.
Checking continuity with my volt meter and the Aux seems to not work. I can verify with the actual studs that the contractor is closed. Sometimes I can power down the battery BMS system and reset and the Aux contract starts working correctly.

Coil input voltage is 24VDC,
Using Altran AES500


 

Offline uer166

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Re: Bi-Directional DC Relay Contactor and Auxilkiary contact failure
« Reply #1 on: November 08, 2023, 03:35:15 am »
Wetting current issue maybe? How much current does your meter inject when you test it?
 

Offline uer166

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Re: Bi-Directional DC Relay Contactor and Auxilkiary contact failure
« Reply #2 on: November 08, 2023, 03:36:47 am »
"Aux contact current min.: 100mA at 8V". Well there it is!
 

Offline f4eru

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Re: Bi-Directional DC Relay Contactor and Auxilkiary contact failure
« Reply #3 on: November 08, 2023, 09:26:09 pm »
Yep. Clearly the contacts have a very thin oxide layer, appear to make contact, but in fact do not until you break down the tarnish layer with the 8V.


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