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Electric EZGO Electric EZ GO Marathon, Medalist, TXT and RXV. |
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07-29-2018, 12:40 PM | #21 |
Not Yet Wild
Join Date: Jul 2018
Location: Houston
Posts: 33
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Re: Faulty speed controller ???
Great information, Thank you all and Ray...
Removed the Pot again and will try it. It did have some sharpy number written on side, maybe it was replaced and never adjusted. Will give this a shot and let you know. Thanks again. John |
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07-29-2018, 12:48 PM | #22 | |
Not Yet Wild
Join Date: Jul 2018
Location: Houston
Posts: 33
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Re: Faulty speed controller ???
Quote:
Last edited by sicrx69; 07-29-2018 at 12:57 PM.. Reason: added info |
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07-29-2018, 01:09 PM | #23 |
Not Yet Wild
Join Date: Jul 2018
Location: Houston
Posts: 33
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Re: Faulty speed controller ???
So, I figured there wasn't anyway to get a spring, so I just took a pair of needle nose and vice grips and bent the broken spot into a U shape. Adjusted it to hook around the arm and seems to be putting tension on the arm now. Now for the next part....
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07-29-2018, 01:15 PM | #24 | |
Gone Wild
Join Date: Feb 2017
Location: Richmond, TX
Posts: 1,026
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Re: Faulty speed controller ???
Quote:
On the way up it has an intermittent spot and on the way down it drops out completely near the low end. You can open it up and see if you can clean the wire wound coil and wiper and lubricate with a little electrical grease. Now you need a spring... Not sure where to get that... You may have to just get a new unit from one of the site sponsors. The spring assists in creating some pedal up force to return to the stop. I would think there is an additional pedal return spring also to do most of the work. These work together to reduce slop in the throttle linkage to try to create a smooth throttle. |
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07-29-2018, 01:24 PM | #25 | |
Gone Wild
Join Date: Feb 2017
Location: Richmond, TX
Posts: 1,026
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Re: Faulty speed controller ???
Quote:
You may have some excess tension due to less coils but it just might work. Try to cleanup the inside and lubricate. |
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07-29-2018, 03:26 PM | #26 |
Not Yet Wild
Join Date: Jul 2018
Location: Houston
Posts: 33
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Re: Faulty speed controller ???
Ok, Took your advice and reluctantly took it apart. Was surprised how simple it was on the inside. It did also look pretty clean. I noticed the resister at the top of the picture and remembered from my basic electronics class in high school (way too long ago) about the colored bands. I looked up the bands and according to the colors, it gave me 472 and 10 % (?) Yellow violet red gold...
Using the DVM touch each end of the resister gave me 4.68...So sounds close but I digress. I put it all back together, got the spring attached (rigged) and seems to be engaging the micro switch now. I did another video of the resistance, it looks close but does sometimes seem to be erratic at times. I marked the end of travel (the lines with pencil on the PET) and at the end of travel it seems to get close or at 5. Its reads 7.02 max by hand but the throttle linkage will not allow it to reach that high. Going to reinstall and double check it. https://www.youtube.com/watch?v=3cWe5zfQx8I Thank you for taking the time to respond and lend a hand. John |
07-29-2018, 03:49 PM | #27 | |
Techno-Nerd
Join Date: Jun 2011
Location: West Virginia
Posts: 19,654
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Re: Faulty speed controller ???
Quote:
First digit - Yellow = 4 Second digit - Violet = 7 Multiplier - Red = x100 Tolerance - Gold = 5% When the F/R lever is put in the Reverse position, MS-4 put the fixed 4.7KΩ resistor with the 5KΩ pot so you end up with a range of about 0Ω to 2.5KΩ so the controller will only open up to about half speed when cart is in reverse. |
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07-29-2018, 04:18 PM | #28 |
Not Yet Wild
Join Date: Jul 2018
Location: Houston
Posts: 33
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Re: Faulty speed controller ???
You guys are way too smart for me. Got it back in and didn't really help the problem but I definitely learned a lot.
I checked battery voltage after sitting all night off charger and still reads 36 volts. When I check voltage with throttle at maxed and wheels off the ground the voltage goes down to 29-31ish. That sounds low to me? I am going to switch out the batteries with batteries i know run my other cart and see what happens. Its never fun switching out 12 40lb weights but I gotta do what I gotta do... Thank you all for your help John |
07-29-2018, 05:33 PM | #29 | |
Gone Wild
Join Date: Apr 2017
Location: SE TN
Posts: 2,218
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Re: Faulty speed controller ???
Quote:
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07-30-2018, 01:47 AM | #30 | |
Gone Wild
Join Date: Feb 2017
Location: Richmond, TX
Posts: 1,026
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Re: Faulty speed controller ???
Quote:
May not be the reason you are not reaching pack voltage but it will give some issues. If you can solder, order a new pot from Mouser and replace it. Could not read the numbers in the pic. It would be a linear taper pot not and audio taper one. As Walter said start looking at cables and batteries. Any one bad crimp or corrosion condition can cause a voltage loss. Bad cells in any battery will cause an issue. |
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