Contactor coils have low negative voltage. - Maintenance & Troubleshooting discussion in Forkliftaction's forums

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Contactor coils have low negative voltage.

Clark EC500

I have an old clark here with a EV1 card in it.. 48VDC I have perfect forward function but in reverse I have a long delay before contactor coil picks up. I put positive lead on batt and neg lead on coil and I have a growing negative starts at 2 or 3 volts and slowly grows to 18vdc or so before the coil picks up the voltage keeps growing with time to battery voltage. Do I get negative from the card or the coil driver? Or card first then driver then coil... **** old junk. Hehehe.

Posted 23 Dec 2009 06:38
By Davie
joined 5 Dec'08 - 26 messages
Ontario, Canada

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card should be what turns on the coil driver, coil driver provides connection to negative (wire 13). should be the same in forward and reverse after the driver.
It seems to me to be a strange way for the driver to go bad (but not impossible. got a bac-a larm installed??
I would want to check bypassing the coil module (wire 13 is neg),
what you have sounds like the coil armature (the part that holds the moving tips and is pulled down by the coils magnetic field) has a little guide pin in the bottom and this pin may have come loose or be missing.

Posted 23 Dec 2009 11:03
Modified 23 Dec 2009 11:27 by poster
By edward_t
joined 5 Mar'08 - 2,334 messages
South Carolina, United States

"it's not rocket surgery"

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