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Electric EZGO Electric EZ GO Marathon, Medalist, TXT and RXV. |
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04-04-2019, 06:01 PM | #31 | |
Techno-Nerd
Join Date: Jun 2011
Location: West Virginia
Posts: 19,654
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Re: Cart slows to a stop on any incline
Quote:
You get 36V across the armature when the wheels are in the air, so the pot-box throttle and controller appear to be work, maybe not at 100%, but at least working fairly normally without much of a load. So the question is why do you have 36V across the armature with tires are in the air (no load) and only 7v across the armature when tire are on the ground (normal load) Possible answers: 1. Battery pack voltage is dropping to about 10V. 2. Excessive resistance the the high current cables, connection and/or contacts is dropping most of the battery pack's voltage. 3. Duty-cycle of PMW output from controller not reaching 100%. |
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04-04-2019, 09:31 PM | #32 |
Over This Interview Is...
Join Date: Jun 2012
Location: AZ
Posts: 17,449
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Re: Cart slows to a stop on any incline
Best of luck...
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04-05-2019, 05:46 AM | #33 |
Gone Wild
Join Date: Jul 2018
Location: Central Ohio
Posts: 1,720
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Re: Cart slows to a stop on any incline
What kind of batteries did you get? Not all lead acid batteries are created equal. Sounds to me like one of three issues to be the most likely culprit. However, I am not nearly as knowledgeable as those who are already helping you here.
1. Loose terminal connections, and/or multiple wires/cables on posts in wrong order (biggest should go on bottom, followed by smaller terminals). Assuming that the posts and terminal ends were cleaned when installing new batteries. 2. New batteries are not "broke-in" yet. I think this is highly unlikely, as you should still get much better performance than you are describing even with batteries that are not broke-in yet. 3. I feel this is the most likely. The batteries you got are either bad, or not rated for the type of use that a cart requires. What is the brand of your batteries and what are the specs? |
04-05-2019, 06:26 AM | #34 | |
Gone Wild
Join Date: Jan 2009
Location: Ocala, FL
Posts: 384
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Re: Cart slows to a stop on any incline
Quote:
The Curtis 1204 series motor controller has a couple of common failure modes that cause it to go into current-limiting far below the rated current of 275 amps. Failure of the internal thermal sensor (thermistor) or a leaking 10 uf capacitor may cause the reduced current limit. The resulting symptom is very weak cart performance. As a test, bypassing the controller should restore full power but this is a potentially hazardous test an should not be attempted by inexperienced personnel. |
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04-05-2019, 02:13 PM | #35 | |
Gone Wild
Join Date: Jan 2013
Location: Saint Petersburg, FL
Posts: 2,089
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Re: Cart slows to a stop on any incline
Quote:
Check the full battery pack V without the cart doing anything. If it is 36.3v or less then the pack is dead and needs a charge. If it is 37.1v or higher, leave the voltmeter attached while you take a short ride and see what the pack V drops to. There are several options as to what might be the cause and battery V is the easiest one to check |
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04-05-2019, 03:12 PM | #36 |
Gone Insane
Join Date: Oct 2016
Location: Richmond, VA
Posts: 14,215
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Re: Cart slows to a stop on any incline
RAG, let's try this: You have a DVM and I'm sure you know how to use it. You have new batteries, we all know this.
You have the best guys anywhere trying to help you. Some are engineers, some are really smart guys with years of experience. EZ-GO, Club Car, Yamaha, etc. would be proud to have them on their team. Take your meter and test the standing voltage on each battery, and post the results here. Nobody can fully help until you do. |
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