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Old 01-29-2016, 02:11 AM #1
ZachAttack420
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MAC noid polarity?

Is there any polarity to the rear Mac noid on an excal? The wires were broken off then I got it and I need to trouble shoot this sucker.... Will be tough with one noid.

Any tips?

Thanks
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Old 01-30-2016, 12:49 AM #2
skinnyfatguy
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I'd have to open one of mine up to check. Depending if the wires broke off at the base of the noid or just the molex part, I may be able to help out.
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Old 01-30-2016, 02:22 AM #3
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Solenoids are just inductors like electric motors and incandescent light bulbs. Although the leads coming from solenoids are often colored red and black the solenoids themselves are not polarized. In other words you can hook them up either way and it wont matter.

Although solenoids themselves are not polarized, companies like SMC and MAC and Humphrey offer a protection circuit (which is build into the solenoid itself) consisting of a resistor and a flyback diode. Polarity only matters when a solenoid is equipped with one of these circuits.

The solenoids in Angels, early DM's, and E-bladed Autocockers did not come from the factory with this protective circuit.
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Old 01-30-2016, 10:48 PM #4
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I didnt see any different markings on the wires, they broke off clean at the solenoid.

These are MAC 43, didnt aee anything about a protection circuit with a quick search. Are these protected?
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Old 01-31-2016, 03:16 AM #5
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Truthfully I do not know, but worst case scenario: The solenoid has a protection circuit and you hook the solenoid up backwards, you power the board up and try to fire the marker and notice that the solenoid is not really working that well or at all. solution: plug the solenoid in the other way.

You arent going to hurt the solenoid in either case. If it does have a protection circuit then the diode is simply going to prevent/reduce the current reaching the solenoid.

Last edited by davethewave12321 : 01-31-2016 at 03:20 AM.
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Old 01-31-2016, 05:11 PM #6
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Ok, thanks for the info. Its re-soldered and hot glued, hope its in the right way first time.

Thanks!
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