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Unread 05-01-2015, 07:33 AM   #31
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Join Date: May 2010
Location: FS LOUISIANA
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Default Re: What kills controllers?

I did a run test on the front motor with 12 volts. It Ran forward and reverse. Hooked it back up turned the key on and the controller for the front motor is lit solid.

Yesterday I installed a volt meter in the cart. $9 from amazon. It reads within .3 volts of my meter...... Less than 1% diff. I used the cart yesterday to pull a small trailer around the yard to pick up sticks. It ran fine for the most part (still waiting on the new controller). Here's the weird part. If you creep up slowly some distance and then stop you can hear the front motor tic tic tic..... Like it is switching from forward to reverse with very little power (Cart isn't moving). So I checked the motor and found no voltage across the armature leads but did find a fluctuating current of about 20 volts across the field current leads. That must be some bad voodoo crap within the controller I guess. Anyone ever see something like this? It's a sepex motor.

It seems to only do that after a slow movement. If you accelerate and stop faster it does not do the low field voltage thing.
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Unread 05-01-2015, 07:43 AM   #32
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Default Re: What kills controllers?

Sepex controllers that provide roll away brake do so by powering the field coils.

Perhaps you have a faulty/noisy speed sensor that keeps sending pulses to the controller, the controller would power the field and plug the armature if that was the case.

If your setup uses a speed sensor, try unplugging it when the problem occurs and see if it stops.
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Unread 05-01-2015, 09:45 AM   #33
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Default Re: What kills controllers?

Would a speed sensor require additional wires? I would not think the signal could be sent back thru the F1 F2 leads but I'm just guessing. There are only four wires connected to the motor. A1 A2 and F1 F2. I'll see what data I can find on the motor..... I don't know if it has a speed sensor or not. Thanks for the info.
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Unread 05-01-2015, 10:06 AM   #34
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Default Re: What kills controllers?

If Your motor has a speed sensor, it normally comes off the end of the motor with smaller gauge wires.
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Unread 05-01-2015, 10:47 AM   #35
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Default Re: What kills controllers?

10-4. No speed sensor then. So the controller is sending some field current when it should not be.
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Unread 05-02-2015, 11:17 AM   #36
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Default Re: What kills controllers?

Took a ride thru the woods this morning. Made about a 5 mile round trip. Flat ground.... Some mud.....easy ride. At the end the on board volt meter was riding 43 to 45 volts most of the time. After resting for 1/2 hour the pack voltage was at 48.5. What do you guys think about that? Are those readings acceptable? Is it ok to pull the voltage down to 42 volts when riding on a 48 volt pack?
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Unread 06-11-2019, 09:48 AM   #37
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Default Re: What kills controllers?

Looks like you just saved me some grief. I purchased Bad Boy #B372 and it will be a restoration project. Appears to have been underwater at some point in time.
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