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emrath(at)comcast.net
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 Posted: Sat Nov 29, 2008 3:59 pm Post subject: Failed contactor |
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Bob:
I disconnected the diode between the terminals. With the master off, I read
on my Fluke meter 13.34 VDC on the terminal fed from the jumper to the fat
battery terminal. The other terminal with the ground lead to the master
switch reads 0.47 VDC with the master off. With the master switch on,
voltage between the two small terminals reads 13.34 VDC. I checked the
continuity of the master wire and switch to ground and it works fine. I also
disconnected everything and get an open circuit reading between the two
small terminals, no resistance and no short circuit warning on my Fluke. If
you ask me, the small internal coil on the contractor has failed open. Does
this seem possible with a new contactor?
Marty
Subject: Re: Failed Contactor?
From: Robert L. Nuckolls, III (nuckolls.bob(at)cox.net)
Date: Sat Nov 29 - 9:20 AM
At 10:02 AM 11/29/2008, you wrote:
| Quote: |
I was demonstrating my newly wired panel for family this weekend and the
contractor mysteriously dropped off line. I had my battery charger
connected to the battery and system voltage was 13.3v DC. When the master
is OFF, I'm seeing .5v between the two small contactor terminal with the
diode removed and zero volts when the master is ON, yet contactor will not
activate. All other external wiring checks out and the contractor is wired
per the B&C web site. System has been working fine up until now, any one
have ideas as to what has happened? Did the Contactor suddenly go bad?
|
The contactor will not operate until voltage between the two
small terminals exceeds 8 volts or so. The voltages you
cited for the two positions of the master switch were at or
near zero. This means that the jumper between the fat battery
terminal and the small coil terminal is open . . . or the
wiring between the other small terminal through the master
to ground has gone open.
Bob . . .
Marty ҿӬ
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nuckolls.bob(at)cox.net
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| Posted: Sun Nov 30, 2008 8:56 am Post subject: Failed contactor |
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At 05:58 PM 11/29/2008, you wrote:
| Quote: |
Bob:
I disconnected the diode between the terminals. With the master off, I read
on my Fluke meter 13.34 VDC on the terminal fed from the jumper to the fat
battery terminal. The other terminal with the ground lead to the master
switch reads 0.47 VDC with the master off. With the master switch on,
voltage between the two small terminals reads 13.34 VDC. I checked the
continuity of the master wire and switch to ground and it works fine. I also
disconnected everything and get an open circuit reading between the two
small terminals, no resistance and no short circuit warning on my Fluke. If
you ask me, the small internal coil on the contractor has failed open. Does
this seem possible with a new contactor?
|
ANYTHING is possible. Your measurements do indicate that
the contactor coil is indeed open. It would be interesting
to do a tear-down and find out where it broke. You should
be able to get a replacement from whoever sold it to you.
Bob . . .
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emrath(at)comcast.net
Guest
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| Posted: Sun Nov 30, 2008 7:29 pm Post subject: Failed Contactor |
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Thanks for the vote of confidence. I'll call Todd at B&C tomorrow about
this.
Marty
Subject: Re: re: Failed contactor
From: Robert L. Nuckolls, III (nuckolls.bob(at)cox.net)
Date: Sun Nov 30 - 8:56 AM
At 05:58 PM 11/29/2008, you wrote:
| Quote: |
Bob:
I disconnected the diode between the terminals. With the master off, I
read
|
| Quote: | on my Fluke meter 13.34 VDC on the terminal fed from the jumper to the fat
battery terminal. The other terminal with the ground lead to the master
switch reads 0.47 VDC with the master off. With the master switch on,
voltage between the two small terminals reads 13.34 VDC. I checked the
continuity of the master wire and switch to ground and it works fine. I
also
|
| Quote: | disconnected everything and get an open circuit reading between the two
small terminals, no resistance and no short circuit warning on my Fluke.
If
|
| Quote: | you ask me, the small internal coil on the contractor has failed open.
Does
|
| Quote: | this seem possible with a new contactor?
|
ANYTHING is possible. Your measurements do indicate that
the contactor coil is indeed open. It would be interesting
to do a tear-down and find out where it broke. You should
be able to get a replacement from whoever sold it to you.
Bob . . .
Marty ҿӬ
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http://www.matronics.com/Navigator?AeroElectric-List |
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