You can not easily measure what the coil voltage is out of circuit.
Often this is only written on the coil terminal or the coil itself,
since different coils can be fitted in any one contactor.
I have highlighted the position of the voltage label in this image,
this is typical:
<http://i47.tinypic.com/4hnqv.jpg>
However you can measure with your multimeter what voltage is applied
at the coil terminals inside the washer. Most probably it will be your
local mains voltage, but it could rarely be a low voltage control
signal such as 24V.
A coil is good if it has a resistance of a few ohms out of circuit
(not open), and pulls the contactor bar down when installed and
energized.
In addition to the coil (which is the control element that pulls the
bar down) there are also contacts or "switches" in your contactor.
These are what the 40A rating applies to, the coil only draws a very
small current.
The switches or contacts can be tested out of circuit by measuring the
resistance or continuity with your ohmmeter and pressing the bar down.
Typically a contactor with 3 contacts has just normally open contacts
(the circuit is closed when the bar is pushed down by the coil), a
contactor with 4 contacts typically has 3 normally open contacts and
one normally closed contact to the very right that opens as the bar
goes down. (Other configurations are rare but possible).
ST
On Wed, Jul 18, 2012 at 5:00 PM, jimybud <jimybud@casscomm.com> wrote:
> How would I test the coil within this contact?
>
> Also, with a multimeter should I also be able to tell what voltage the coil is?
>
> Also, I am assuming that when power flows thru the coil that creates the mechanical energy to cause the contacts to touch.
>
> I know am no longer able to get any part of the pressure washer to work. Previously the water pump would work but not the heating unit. Know I can not get any functionality via the swith.
>
> When I manually push down on the contactor switch the water pump does work, but not the heating unit.
>
> Below is a photograph
>
> http://groups.yahoo.com/group/Electronics_101/photos/album/710205676/pic/593771835/view?picmode=large&mode=tn&order=ordinal&start=1&dir=asc
>
>
>
>
>
> ------------------------------------
>
> Please trim excess when replyingYahoo! Groups Links
>
>
>
No comments:
Post a Comment