Results 1 to 7 of 7
Thread: Contactor Bouncing or Hammering
-
22-09-2010, 07:52 PM #1
Contactor Bouncing or Hammering
Hello,
I have looked at a few units in the past where the contactor for the compressor has constanly bounced when power is applied to the coil to bring on the contactor. I have changed the contactor in the past and this has cured the problem. But sometimes it hasn't and the PCB has been faulty or the compressor What causes the contactor to bounce? Is it the coil no longer producing the same pull or can the current passing the contactor somehow effect the coil? The power to the coil has not been fluctuatiing on my testers.
Any help is greatfully received.
-
22-09-2010, 08:07 PM #2
Re: Contactor Bouncing or Hammering
in general, if the coil is causing the contactor to chatter, it usually means, in the absence of controls fault, that the coil connections are loose/corroded. sometimes i have found dry connections on pcbs that only show up on visual checks and do not show as voltage fluctuations.
-
22-09-2010, 08:13 PM #3
Re: Contactor Bouncing or Hammering
Have you also looked at the neutral connection?
Contactors invariably chatter if the supply voltage drops below the pull in threshold, or the neutral connection is loose/corroded. (Assuming mains voltage) The volt drop can be caused by various things, one of which is loose connections.
Contactors 'buzzing' while pulled in is a sign that dirt/swarfe has found it's way into the inside of the coil.
-
22-09-2010, 09:00 PM #4
-
22-09-2010, 09:37 PM #5
Re: Contactor Bouncing or Hammering
Careful Jon, in your case it just might be cow s**t!!
-
25-09-2010, 05:57 PM #6
Re: Contactor Bouncing or Hammering
Thanks guys that has helped. I shall look forward to my next chattering contactor and take a good look at it
Thanks again.
-
25-09-2010, 06:05 PM #7
Re: Contactor Bouncing or Hammering
When the contactor is energised by LP pressure control, check the contacts. I have seen this a few times and it was caused by bad contacts in the pressure control.
Similar Threads
-
liquid hammering on pumped liquid line R717
By VEYSEL DURLU in forum Trouble ShootingReplies: 20Last Post: 27-03-2008, 05:19 PM -
refrigeration hammering
By mahesh in forum NH3Replies: 4Last Post: 05-11-2006, 09:38 PM