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Old 09-06-2016
mpierce mpierce is offline
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Default Relay buzzing badly, replacement?

My main power transfer switch hums some. There is a pretty loud buzzing coming from that area, that I thought was the AT switch. I just removed the leaking water heater, and have MUCH better access to that area now.

It is a smaller electric box that is buzzing, right beside the AT box. When I turn off the breaker labeled:

Inverter/battery charger, & rear receptacles

The buzzing stops. I opened the box up, and there is a relay in there. Could not find any writing on it.

I am going to try to post a pic of it, maybe one of the electrical gurus on here can ID it for me, so I can order it, and have the replacement here before taking it out.

I want to replace it while I have the water heater out, as the access is so much better!

Thanks.
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Last edited by mpierce; 09-06-2016 at 12:43 PM.
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Old 09-06-2016
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brhodes brhodes is offline
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Check this one which is used for the inverter AC feed:

http://www.plccenter.com/en-US/Search/?q=PRD-11AG0-120


If it is the one as I show in the center enclosure with the brown plastic cover, make sure you turn off the Inverter as well as house AC power.
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Last edited by brhodes; 09-06-2016 at 01:10 PM.
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Old 09-06-2016
mpierce mpierce is offline
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Ordered one. That is EXACTLY the one! Under the brown plastic cover. Thanks. Sent email address to you. Thanks again.

Melvin
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Old 09-07-2016
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KCSS KCSS is offline
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Been there - done that..........
Inverter relay. In my case up behind kitchen sink. attached is drawing of my wiring for this relay. Hope out helps
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File Type: pdf INVERTER CIRCUIT RELAY WIRING.pdf (261.2 KB, 146 views)
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Old 09-07-2016
mpierce mpierce is offline
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Thanks, KC. Would hate to take it out, and rewire it wrong! With the water heater removed, it is somewhat possible to take change. With the heater in place, oh boy! Do screws hold the relay to the steel box? I assume so.

It might be easier to take the box off the wall, so it can come into the open space, then take the relay out, just to get more operating room. Not much room for a 6', 250# guy, sitting in the rear closet, working in a little cubby hole! LOL
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Old 09-07-2016
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I had a couple of relays buzzing like that. They were actually still good. What sometimes happens is they get a little buildup on the contacts. Disconnect power from them get a piece of 600 grit sand paper and slide between contacts back a forth 6-7 times. Re-energize and see if it stops... it worked for me, never had another problem after that. If its bad, well youll know for sure.
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Old 09-07-2016
konehd konehd is offline
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When I was working we had panels with hundreds of those relays! The AC ones would buzz all the time. Rather than replacing we'd stick a piece of paper between the armature and the core. Thats where the buzzing comes from...

Worked most of the time! If not, then replace...

HTH, Joe
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Old 09-07-2016
mpierce mpierce is offline
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Quote:
Originally Posted by Somervillebus View Post
I had a couple of relays buzzing like that. They were actually still good. What sometimes happens is they get a little buildup on the contacts. Disconnect power from them get a piece of 600 grit sand paper and slide between contacts back a forth 6-7 times. Re-energize and see if it stops... it worked for me, never had another problem after that. If its bad, well youll know for sure.
Tried that. No help at all. Thx.
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1990 PT40WB
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Old 09-07-2016
mpierce mpierce is offline
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Quote:
Originally Posted by konehd View Post
When I was working we had panels with hundreds of those relays! The AC ones would buzz all the time. Rather than replacing we'd stick a piece of paper between the armature and the core. Thats where the buzzing comes from...

Worked most of the time! If not, then replace...

HTH, Joe
Not smart enough to know where that would be. Can I do it from the front, without removing it? Just where would I put the paper?
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  #10  
Old 09-07-2016
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Quote:
Originally Posted by konehd View Post
When I was working we had panels with hundreds of those relays! The AC ones would buzz all the time. Rather than replacing we'd stick a piece of paper between the armature and the core. Thats where the buzzing comes from...

Worked most of the time! If not, then replace...

HTH, Joe
Quote:
Originally Posted by mpierce View Post
Not smart enough to know where that would be. Can I do it from the front, without removing it? Just where would I put the paper?
Just my 2¢ but putting paper between the magnetic pole pieces of a relay should result in higher coil current and higher coil temperature since the pole pieces can’t make full contact. How much higher - I’m not sure – but it may be significant.
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