Re: REQ: coil volatage on old relay
- From: Al <no.spam@xxxxxxxxxx>
- Date: Wed, 27 Jun 2007 20:46:35 GMT
In article <Xns995CA02AE945Ecapnjohnsalsgivercom@xxxxxxxxxxxxx>,
"Cap'n John" <capnjohn@xxxxxxxxxxxxx> wrote:
Got a 1960s vintage sealed relay with an octal base, DPDT but no indication
of coil voltage. Part No. is C.P. Clare HG2A1016.
Any help appreciated- I just may have a use for this puppy!!
TIA!
Cap'n John
I have a bunch of old Potter & Brumfield ones. They are all 24VDC.
You might try this. Use a variable dc power supply. Connect to the coil
leads at zero volts. Increase the voltage until the armature moves. This
is the pull-in voltage. Write it down. Now drop the voltage and wait
until the armature drops down. this is the drop-out voltage. Now add the
drop-out voltage to the pull-in voltage. Then go to the nearest highest
value that makes sense, like 5V, 6V, 12V, 24V, 48v... this could then be
used as your coil rating. Run it at that voltage for a while. Monitor
the current and the temp. If it doesn't run away, you're good.
Al
.
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