Yes.
Another thing that hasn't been addressed is contactor inrush current. Until the pole faces meet, the coil current can be very high. Until that dies away, the contactor can sound quite noisy.
480 v contactor chattering at start up ?
- Thread starter gsmith2853
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Another thing that hasn't been addressed is contactor inrush current. Until the pole faces meet, the coil current can be very high. Until that dies away, the contactor can sound quite noisy.
- Location
- San Francisco Bay Area, CA, USA
- Occupation
- Electrical Engineer
This is why I started by saying I was jumping ahead by 5 guesses... in reference to the "20 questions" game comment before that.
In the absence of more information, that's all we can do.
I'm taking it that a lack of follow-up by the OP is a sign of my being the winner!
In the absence of more information, that's all we can do.
I'm taking it that a lack of follow-up by the OP is a sign of my being the winner!
I would take it as a lack of follow up...........This is why I started by saying I was jumping ahead by 5 guesses... in reference to the "20 questions" game comment before that.
In the absence of more information, that's all we can do.
I'm taking it that a lack of follow-up by the OP is a sign of my being the winner!
kwired
Electron manager
- Location
- NE Nebraska
- Occupation
- EC
Then there is a problem in the control circuit instead of the main supply circuit.
ptonsparky
Tom
- Occupation
- EC - retired
OP: Did it ever work? Was it done correctly to begin with? Are they using 480v to the 240v rated pressure switch for control or worse to a small relay that has 120V (or less) rated contacts?
Or it's a faulty contactor. Or it's just noisy on inrush.
Maybe Smithy will come back and reveal all.
kwired
Electron manager
- Location
- NE Nebraska
- Occupation
- EC
Maybe he needs to tell us what he means by "chatter".
Most of us have assumed that chatter means it is rapidly cycling in-out as in not enough voltage to keep it held. If problem goes away once motor has reached normal operating speed, sure seems voltage drop during starting would be the most obvious thing to look into first.
The long and the short of it is that the paucity of detail precludes any precise diagnosis.
kwired
Electron manager
- Location
- NE Nebraska
- Occupation
- EC
In other words, a normal thread on this site
ptonsparky
Tom
- Occupation
- EC - retired
Have we passed the 20 questions yet? Some are duplicates and IDK if those should count.
Problem is there are no answers.
jumper
Senior Member
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- 3 Hr 2 Min from Winged Horses
Ah, but there is always THE answer: 42.
:thumbsup:
just the cowboy
Inactive, Email Never Verified
- Location
- newburgh,ny
Answer 21
Answer 21
I'll just keep guessing, answer 21. If it is for a sump pump, I gave seen them (cycle) chatter because it was oversized. Starts up and drains sump, shuts off, check valve not working and pumped up water comes back down pipe to sump. Repeat repeat repeat.
Answer 21
I'll just keep guessing, answer 21. If it is for a sump pump, I gave seen them (cycle) chatter because it was oversized. Starts up and drains sump, shuts off, check valve not working and pumped up water comes back down pipe to sump. Repeat repeat repeat.
Douglas Adams would have been proud of you...........Ah, but there is always THE answer: 42.
- Location
- San Francisco Bay Area, CA, USA
- Occupation
- Electrical Engineer
I like it. :thumbsup:
ptonsparky
Tom
- Occupation
- EC - retired
A water logged pressure tank can cause some rapid cycling, not sure if I would call it chatter but we don't know what the OPs definition is either.
I wouldn't either.
That would be more like a clock ticking rather than a machine gun type chatter.
We just don't know.
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