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Old 05-02-2017, 04:17 PM
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Watlow buzzing

Got to the studio this morning and my Watlow was buzzing real loud.... I have a 400# Stadleman....I thought that it might have been a partial load thing so we tightened all the clamps and straps, but it continued. We are still at temp, but the recovery is a little sluggish. This is not the programmable "brain", but the one with the fuse and contacts in it...... any suggestions?

Last edited by Mark Rosenbaum; 05-02-2017 at 04:23 PM.
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Old 05-02-2017, 06:47 PM
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what is the positive cut off relay? I have Mercury relays that live to buzz. It could also be rf interference with the scr. If that's the case it can be fixed with a snubber that fits over the wire. You should be able to isolate the buzzing sound. You can use a dry wooden dowel just hold it gently against what your testing and you should be able to either feel it or quiet it down.

I'm sure someone probably knows exactly what your describing but when you said wattlow all I can think of is the programmable controller.
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Old 05-03-2017, 07:27 AM
Victor Chiarizia Victor Chiarizia is offline
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shut it off momentarily and restart. v
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Old 05-03-2017, 01:09 PM
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We feel that it is the contact buzzing.... I have a spare, but that has "buzzing" written on it, so it has happened before....
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Old 05-03-2017, 04:30 PM
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My recollection was of the transformers buzzing if they were turned down too far, but I have no idea about the watlow. Call Watlow.
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Old 05-03-2017, 06:12 PM
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It is the contact kit inside the Watlow, so it is not their unit.... trying to find a unit now.... Cutler Hammer 200 amp contact kit sn#C25KNE3200 series A1
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Old 05-03-2017, 10:50 PM
Tony Serviente Tony Serviente is offline
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My kiln contactors all eventually buzz. The transformer windings are constantly vibrating 60 time a second and will only be constrained from singing for so long. My kilns usually fire at night when I am at home, and some times I will fire them during the day and am sometimes shocked at how loud they can buzz. They still work fine, just sound like an angry bunch of hornets.
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Old 10-11-2017, 12:12 PM
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Another one of these relays is buzzing... it is what happens with 13 years of constant use...
We have a spare that was buzzing, but working, that we replaced.
I see that the little contact plates have degraded a bit. One of them looks like there may have been an arc between the two plates. Is it ok just to grind the contacts to make them smooth again? Or will this put a small amount of space between them and make it worse? It is a $1000 part and i hope not to have to buy a new one...TIA...
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Old 10-11-2017, 12:21 PM
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I have a spare of that contactor if it is 150AMP. Brand new.
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Old 10-11-2017, 03:44 PM
Eben Horton Eben Horton is offline
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Nate did it!
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Old 10-11-2017, 11:57 PM
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Quote:
Originally Posted by Pete VanderLaan View Post
I have a spare of that contactor if it is 150AMP. Brand new.
Thanks, but it is a 200 amp contractor.....
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Old 10-12-2017, 08:21 AM
Brian Wong Shui Brian Wong Shui is offline
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Contactor rebuild kits should be available.. It contains new springs and contacts. Buzzing is usually the solenoid not sealing properly
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Old 10-25-2017, 02:32 PM
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I took Brian's advice (thanks Brian!) and got a contactor kit for $400, but less than $800 for a new unit...
These are the plates that we took off. Can these be sanded down and still be used for emergencies? I'm assuming that the buzzing was from an incomplete contact between the two plates.... any thoughts?
Thanks
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File Type: jpg 20171025_112218.jpg (59.7 KB, 34 views)

Last edited by Mark Rosenbaum; 10-25-2017 at 02:49 PM. Reason: photo didn't stick...
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Old 10-25-2017, 02:55 PM
Jordan Kube Jordan Kube is offline
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Looks like you have some arc pitting. I would sand them down only as much as you need and see how they work.
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Old 10-25-2017, 03:48 PM
Brian Wong Shui Brian Wong Shui is offline
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+1 on what Jordan said.

If you use fine emery, you might want to wash it with contact cleaner and remove the abrasive grains.

I think you can use automotive ignition points files to smooth it out and remove the pitting and not have to worry about the abrasive contamination.

FWIW. The contact on the right was heating up....note the discoloration.

--Brian

Last edited by Brian Wong Shui; 10-25-2017 at 03:49 PM. Reason: Added information
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Old 10-27-2017, 01:11 PM
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I love this board. Mostly because at some point I am going to have all the same problems as someone else that already had them.
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Old 10-28-2017, 09:58 AM
Eben Horton Eben Horton is offline
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Quote:
Originally Posted by Scott Novota View Post
I love this board. Mostly because at some point I am going to have all the same problems as someone else that already had them.
Itís like a support group for English car electricians.
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