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Forum index » Science and Technology » Engineering » Control
problems with chattering contactors
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steve3
science forum beginner


Joined: 07 Jun 2006
Posts: 1

PostPosted: Wed Jun 07, 2006 12:44 am    Post subject: problems with chattering contactors Reply with quote

I have a three phase forward/reversing drill press that runs in each
direction. However the contactors for each direction recently started
buzzing or chattering rather loudly. I have already checked for obvious
wiring problems. What are some causes for the loud buzzing?
Sincerely,
Steve
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Cameron Dorrough
science forum Guru Wannabe


Joined: 09 May 2005
Posts: 103

PostPosted: Wed Jun 07, 2006 1:27 am    Post subject: Re: problems with chattering contactors Reply with quote

"steve" <Hilderbrandstephen@hotmail.com> wrote in message
news:1149641053.583045.15380@c74g2000cwc.googlegroups.com...
Quote:
I have a three phase forward/reversing drill press that runs in each
direction. However the contactors for each direction recently started
buzzing or chattering rather loudly. I have already checked for obvious
wiring problems. What are some causes for the loud buzzing?
Sincerely,
Steve

Delamination of the contacts is the usual culprit. Are the contactors
getting hot?

Eventually the contactors will fail (your drill press won't work) and you'll
have to get them replaced.

HTH,
Cameron:-)
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sQuick
science forum beginner


Joined: 25 Sep 2005
Posts: 14

PostPosted: Thu Jun 08, 2006 12:55 am    Post subject: Re: problems with chattering contactors Reply with quote

"steve" <Hilderbrandstephen@hotmail.com> wrote in message
news:1149641053.583045.15380@c74g2000cwc.googlegroups.com...
Quote:
I have a three phase forward/reversing drill press that runs in each
direction. However the contactors for each direction recently started
buzzing or chattering rather loudly. I have already checked for obvious
wiring problems. What are some causes for the loud buzzing?
Sincerely,
Steve


Dirty pole faces ?

sQuick..
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BusyEngineer
science forum beginner


Joined: 09 Jun 2006
Posts: 1

PostPosted: Fri Jun 09, 2006 5:31 am    Post subject: Re: problems with chattering contactors Reply with quote

sQuick wrote:
Quote:
"steve" <Hilderbrandstephen@hotmail.com> wrote in message
news:1149641053.583045.15380@c74g2000cwc.googlegroups.com...
I have a three phase forward/reversing drill press that runs in each
direction. However the contactors for each direction recently started
buzzing or chattering rather loudly. I have already checked for obvious
wiring problems. What are some causes for the loud buzzing?
Sincerely,
Steve


Dirty pole faces ?

sQuick..

A common problem no less, but not caused by bad contacts of the
chattering contactor!
Check the control contacts upline from the chattering Contactor
(switchs or relays).
Most likely, too much resistance in the operating coil circuit which
causes low voltage & high current. use a meter to measure the inrush
current.
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Google

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