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Electrical Issues: Hatch Lift - Battletech Pod - Tail Gate Lift Motor

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PL1:

How about using a bridge rectifier to drive a relay.

Connect the bridge rectifier inputs in parallel with the motor voltage and the outputs to the coil of the relay.



The circuit is usually used to convert AC to DC, but will work for this purpose as long as you use the right diodes.

Regardless of the polarity, when a voltage is applied to the motor, it applies power to the relay coil, closing the contacts which applies the 12v operating voltage to the clutch.


Scott

kahlid74:


--- Quote from: PL1 on February 19, 2013, 02:32:40 pm ---How about using a bridge rectifier to drive a relay.

Connect the bridge rectifier inputs in parallel with the motor voltage and the outputs to the coil of the relay.



The circuit is usually used to convert AC to DC, but will work for this purpose as long as you use the right diodes.

Regardless of the polarity, when a voltage is applied to the motor, it applies power to the relay coil, closing the contacts which applies the 12v operating voltage to the clutch.


Scott

--- End quote ---

Awesome idea!  I did however figure out what the issue was.

The clutch is not the culprit and if not energized, the arm doesn't move even though the motor does.  So here's what I found out, my PS, an Antec 600 Watt was too smart.  Something in the power supply didn't like the DPDT configuration.  I then grabbed a cheapo PS 300 watt no name from the corner of shame, wired it up without the clutch and it works like a SOB.  Sweetness.

So what do you think my Antec PS was seeing that caused it to kill the PS when power was sent through the DPDT.  I also used my Killowat meter and only 1.4 amps were running through the system at the time of the motor running.  So it can't be an amp thing can it?

PL1:

Maybe the Antec PS interpreted the sudden jump in current as a short and shut down to "protect" the system.   :dunno


Scott

kahlid74:

Perhaps it's the motor?  I hooked up a 10A 12VDC DPDT Relay.  The trigger switch works and I can see it work.  Everything is happy except when I try to draw power through it via the motor.  Without the motor I get 12V in either regular or reverse polarity.  So now I'm not sure what's going on.  Is my relay really unable to power the motor?  It's the weirdest thing.  Doesn't make any sense.

PL1:


--- Quote from: kahlid74 on February 19, 2013, 05:30:24 pm ---Perhaps it's the motor?  I hooked up a 10A 12VDC DPDT Relay.  The trigger switch works and I can see it work.  Everything is happy except when I try to draw power through it via the motor.  Without the motor I get 12V in either regular or reverse polarity.  So now I'm not sure what's going on.  Is my relay really unable to power the motor?  It's the weirdest thing.  Doesn't make any sense.

--- End quote ---

IIRC you mentioned previously that you had measured the no-load current draw at about 2A -- I assume that means that the motor works when connected directly.   :dizzy:

When in doubt, draw it out.

A diagram showing how you've got everything hooked up might help clarify things.   :dunno


Scott

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