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

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lilshawn:

the problem with a kilowat plug is that you are only seeing the input side of the power supply. you aren't seeing any of the work being done.

take my ridiculous welding transformer for instance, going in is only ~1000 watts (~10 amps) but it outputs ~1300 amps.(~3000 watts) where did all this extra crap come from? ohms law that's where.

you need to actively measure the motor draw. Your motor is drawing more than the power supply is designed to output. I'm not even going to get into rail load requirements for proper voltage regulation.

yah, yah, yah i know it says 30 whatever amps on this rail and that rail but seriously, that ish is made up. hit up some power supply test reviews. hardly a single power supply now a days can hit the rated wattage listed on the label without blowing up or catching fire.

go get yourself a car battery (or take it out to your car) and hook 'er up. you will know in 2 seconds if your motor works or not.





kahlid74:


--- Quote from: lilshawn on February 20, 2013, 07:26:15 pm ---the problem with a kilowat plug is that you are only seeing the input side of the power supply. you aren't seeing any of the work being done.

take my ridiculous welding transformer for instance, going in is only ~1000 watts (~10 amps) but it outputs ~1300 amps.(~3000 watts) where did all this extra crap come from? ohms law that's where.

you need to actively measure the motor draw. Your motor is drawing more than the power supply is designed to output. I'm not even going to get into rail load requirements for proper voltage regulation.

yah, yah, yah i know it says 30 whatever amps on this rail and that rail but seriously, that ish is made up. hit up some power supply test reviews. hardly a single power supply now a days can hit the rated wattage listed on the label without blowing up or catching fire.

go get yourself a car battery (or take it out to your car) and hook 'er up. you will know in 2 seconds if your motor works or not.

--- End quote ---

Thanks for more info man.  I'm not super familiar with this stuff, only the basics, so any place to start troubleshooting is good to go.  So from a high level, why would it work before with the PS and now not work?  Perhaps the PS is no longer able to supply the power it needs?

DaOld Man:

Maybe Im missing something here, but does the clutch maybe have a diode across the coil for snubber control? If so, if you reverse the current on the clutch you could be shorting out the power supply.
(This may have already been discussed, I havent intensely read every post.)
If this cant be the problem, if you can remove the brushes on the motor, take them out and see if one is broken.
Do you have a 10 amp auto battery charger? You can try the motor on it.

kahlid74:


--- Quote from: DaOld Man on February 21, 2013, 10:04:07 am ---Maybe Im missing something here, but does the clutch maybe have a diode across the coil for snubber control? If so, if you reverse the current on the clutch you could be shorting out the power supply.
(This may have already been discussed, I havent intensely read every post.)
If this cant be the problem, if you can remove the brushes on the motor, take them out and see if one is broken.
Do you have a 10 amp auto battery charger? You can try the motor on it.

--- End quote ---

I have a battery charger yeap.  I'll go grab it and try that.

kahlid74:

Lilshawn you are right.  The draw of AMPs is above 10 so the relay is failing, but are relays supposed to give an indication of when they fail?

Thanks DaOld Man, I hooked up my Lanmower charger which is supposed to be 6AMP at 12volt and the amp gauge went way off the side over 8 AMPs and the motor ran.

So I need a stronger relay and I need a solid PS that's 12volt 20AMP.

Thanks again guys!

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