| Author |
problem with chattering contactors for drill press machine
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| steve 2006-06-06, 10:21 pm |
| Need advice:
What are some causes for chattering relays. I have a three phase drill
press machine with forward/reversing contactors. It runs in both
directions but the contactor for each direction buzzes or chatters
rather loudly. I have already checked for loose wires and obvious
problems.
Sincerely,
steve
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| SQLit 2006-06-06, 10:21 pm |
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"steve" <Hilderbrandstephen@hotmail.com> wrote in message
news:1149640384.683019.215600@y43g2000cwc.googlegroups.com...
> Need advice:
>
> What are some causes for chattering relays. I have a three phase drill
> press machine with forward/reversing contactors. It runs in both
> directions but the contactor for each direction buzzes or chatters
> rather loudly. I have already checked for loose wires and obvious
> problems.
>
> Sincerely,
> steve
voltage measures ok?
measured the amp draw of the coils?
How old are they?
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| Skenny 2006-06-07, 1:21 am |
| Sounds like a bad contactor, or perhaps the coil's shunt has become
dis-engaged, or it could be something blocking the contacts and letting the
armature not fully engage.
"steve" <Hilderbrandstephen@hotmail.com> wrote in message
news:1149640384.683019.215600@y43g2000cwc.googlegroups.com...
> Need advice:
>
> What are some causes for chattering relays. I have a three phase drill
> press machine with forward/reversing contactors. It runs in both
> directions but the contactor for each direction buzzes or chatters
> rather loudly. I have already checked for loose wires and obvious
> problems.
>
> Sincerely,
> steve
>
>
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| |
| Skenny 2006-06-07, 1:21 pm |
| "the coil's shunt"...
oops, I meant the coil's SHADING coil, a small ring like piece of copper
that "fills in the valleys" of the incoming AC. On some contactors this
shading coil is removable, I would make sure one isnt missing. (Should be
one for each coil, forward and reverse).
"Skenny" <skenny@high_streamDOTnet> wrote in message
news:1149649995_42857@sp6iad.superfeed.net...
> Sounds like a bad contactor, or perhaps the coil's shunt has become
> dis-engaged, or it could be something blocking the contacts and letting
> the armature not fully engage.
>
> "steve" <Hilderbrandstephen@hotmail.com> wrote in message
> news:1149640384.683019.215600@y43g2000cwc.googlegroups.com...
>
>
>
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> Newsgroups
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| |
| sQuick 2006-06-07, 10:21 pm |
|
"steve" <Hilderbrandstephen@hotmail.com> wrote in message
news:1149640384.683019.215600@y43g2000cwc.googlegroups.com...
> Need advice:
>
> What are some causes for chattering relays. I have a three phase drill
> press machine with forward/reversing contactors. It runs in both
> directions but the contactor for each direction buzzes or chatters
> rather loudly. I have already checked for loose wires and obvious
> problems.
>
> Sincerely,
> steve
>
Dirty pole faces. strip the contactor out and clean the pole faces,
probably be as good as new..
sQuick..
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| TimPerry 2006-06-08, 12:21 am |
| steve wrote:
> Need advice:
>
> What are some causes for chattering relays. I have a three phase drill
> press machine with forward/reversing contactors. It runs in both
> directions but the contactor for each direction buzzes or chatters
> rather loudly. I have already checked for loose wires and obvious
> problems.
>
> Sincerely,
> steve
buzzing might be loose laminations in the relay coil. annoying but not
threatening.
chattering does not sound good. does this mean the drill behaves in a jerky
manner in operation?
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