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Unread 03-14-2016, 02:03 PM   #61
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Default Re: cart slower after new cables

The controller measures the voltage on the B+ terminal right after it sends a signal for the Solenoid to close.

If the voltage at that time is not higher than it was, the controller assumes the Solenoid contacts are welded together and generates a "main welded" error.

The default behavior on those Curtis controllers is to operate a half-speed in this case.

The proper size resistor will save both the Solenoid Contacts from "pitting" due to arcing and the capacitors inside the controller from possibly getting too much of an initial current at the time the solenoid closes.

You can certainly remove the wire that is shorting the 2 large posts for testing and verify You will get your speed back, but don't run it like that for too long.
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Unread 03-14-2016, 02:05 PM   #62
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Default Re: cart slower after new cables

Quote:
Originally Posted by scottyb View Post
That thinking is not correct.

Remove the wire and the cart should run as Gman said it may.
Ha I really appreciate all the info and the help..... For time i'm gonna disconnect battery's and tow switch off and just cut the wire in half and electric tape off of each end to see how it does being I am going to replace that wire with a resistor anyways.... Will not run it for long Sergio... Thanks!
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Unread 03-14-2016, 04:01 PM   #63
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Default Re: cart slower after new cables

One thing i was sitting here thinking about..... What would be the difference of having the solid wire ran from post to post vs. me taking the wire out? Sorry for all the questions just got to thinking about that
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Unread 03-14-2016, 04:04 PM   #64
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Default Re: cart slower after new cables

Please read my post #61 again, a short across the solenoid contacts will make the controller see the same voltage before and after the solenoid contacts close, that is what causes the "Main Welded" error condition.
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Unread 03-14-2016, 05:06 PM   #65
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Default Re: cart slower after new cables

You guys are teaching me a lot about these carts. I have enjoyed following this thread. I'm sure the OP is not enjoying like I am."sorry"

It seems that a few photos of controller, solenoid,and battery area would have shown the problem. Great work
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Unread 03-14-2016, 05:20 PM   #66
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Default Re: cart slower after new cables

Gotcha... missed that whole part I guess...
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Unread 03-14-2016, 05:57 PM   #67
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Default Re: cart slower after new cables

Yes, a critical piece of information is not mentioned. And it takes 6 pages to read by the way ... I did such and such Wait, what? Bam. But it's easy to get off on the wrong track without all the pertinent info.
I think these guys did a great job of eliminating all the things it could not be before the problem was discovered.
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Unread 03-19-2016, 06:29 PM   #68
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Default Re: cart slower after new cables

Finally had a chance to put the pre charge resistor on today and that fixed my problem. Cart is back to running 18-20 mpg wide open again!! Thanks for all the advice and help!!
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Unread 03-19-2016, 07:29 PM   #69
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Default Re: cart slower after new cables

That's great to hear.
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Unread 03-19-2016, 09:41 PM   #70
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Default Re: cart slower after new cables

The precharge resistor DID NOT FIX THE CART> just so readers know the reason the cart went slow was because owner put a 10g wire in place of the precharge resistor which fooled the controller into thinking the solenoid contacts were welded closed which ... put the controller in safety operation which produced the reduced speed. Taking the 10g wire off would have produced the same result as replacing the
precharge resistor

Glad you got it sorted out.
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