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Electric EZGO Electric EZ GO Marathon, Medalist, TXT and RXV. |
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10-28-2011, 12:30 PM | #21 |
Gone Wild
Join Date: Feb 2011
Location: Florida USA
Posts: 162
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Re: 1992 EZ GO Marathon
System voltage drops to 2VDC??? As in battery voltage accross the pack?
That would be a bad battery (or more!). What happened to 35.5V? Barna |
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10-28-2011, 12:55 PM | #22 |
Not Yet Wild
Join Date: Oct 2011
Posts: 32
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Re: 1992 EZ GO Marathon
System voltage drops 2vdc. Sorry about that. I edited it in previous post.
I just tested the ind. batteries while pressing on and off the pedal and they were all consitently dropping 0.3vdc The Curtis controller model # 1204 027 |
10-28-2011, 01:18 PM | #23 | |
Techno-Nerd
Join Date: Jun 2011
Location: West Virginia
Posts: 19,654
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Re: 1992 EZ GO Marathon
Quote:
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10-28-2011, 01:21 PM | #24 | |
Gone Wild
Join Date: Feb 2011
Location: Florida USA
Posts: 162
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Re: 1992 EZ GO Marathon
Quote:
I still fail to see how 35+V at the solenoid or controller during takeoff attempt could cause the cart not to move due to one or more weak batteries but that's just my opinion Barna |
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10-28-2011, 01:31 PM | #25 | |
Techno-Nerd
Join Date: Jun 2011
Location: West Virginia
Posts: 19,654
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Re: 1992 EZ GO Marathon
Quote:
Batteries are probably okay, so something is drawing enough current to drop the pack voltage by 2V. Could be a stalled motor or a bad controller. See if the motor will turn (cart moves when pushed) before looking at the electrical system any further. Here is a manual for the 1204 and 1205 series controllers. Be careful reading it since not everything applies to your specific application, but it explains how a controller works and the troubleshooting steps towards the end are pretty good. Figure-9 on Pg-13 is a pretty good generic diagram of the high current circuit in your cart. Last edited by JohnnieB; 10-28-2011 at 01:39 PM.. Reason: corrected page # |
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10-28-2011, 01:42 PM | #26 |
Gone Wild
Join Date: Feb 2011
Location: Florida USA
Posts: 162
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Re: 1992 EZ GO Marathon
Good point to see whether the cart can be pushed or not! I assumed it did (never assume!)!
However I'm willing to bet, if there was a mechanical lockup and he tries to take off,the battery voltage will sag way below 35.5 at full pedal accompanied by some kind of torquing action/sizzling/heat/smoke etc from somewhere under the seat. I'm also a fan of LOAD testing electronics and not to rely on what a volt meter says without a load across the circuit. Even if it is 3 automotive incandesent bulbs in series to simulate a 36V load.(headlight or at least turn signal/brake light bulbs). Because if there is high resistance internally in the controller,you will read perfect voltage until you put a load across there and I'm not going to lie,I learned that the hard way : ) ) Barna Last edited by 72volt_ezgo; 10-28-2011 at 01:50 PM.. Reason: added explanation |
10-28-2011, 03:05 PM | #27 | |
Techno-Nerd
Join Date: Jun 2011
Location: West Virginia
Posts: 19,654
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Re: 1992 EZ GO Marathon
Quote:
I also prefer measuring circuits under load. And I prefer to use the right tools and test equipment for the job, but sometime one has to make do with what is available. I'm sure if either of us had mike's cart sitting in front of us, we would have had the problem nailed in 5 minutes or less, but trying to do it by remote control takes longer. I also learned some things the hard way. For example, I learned how DOMs read pulsed DC after replacing a $10,000 photomultiplier tube. (Bad filter cap on a full wave bridge that feed an adjustable regulated power supply feeding a 10V to 10KV DC-DC converter. When DOM read 10V the regulated PS was actually putting out clipped sine waves that peaked at 14.4V so the tube was getting hit with 14.4KV 120 times per second and didn't like it too much) Hopefully mike71 will be able to figure out what is wrong with his cart despite being pulled/pushed in different directions. |
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10-28-2011, 03:39 PM | #28 |
Not Yet Wild
Join Date: Oct 2011
Posts: 32
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Re: 1992 EZ GO Marathon
Ok. Here we go again.
With M- disconnected at Controller and B+ still attached I tested from Controller(where M- would normally be if I hadn't detached it) to B+ and received 39vdc shortly after pedal was pressed and the solenoid clicked but the voltage did not build up gradually to this point nor did it increase any farther than 39vdc. Retested M- to B+(which leads to motor and not the one that goes to the solenoid) with them both removed from the contactor(just testing the wires themselves) and I got 0.5(Ohms). The DVM that I am using is a Fluke 177 True RMS I haven't tested the cart by sitting in it and pushing with my hand yet but the wheels seem to spin easily with the cart up on the jack stands. Any more ideas? |
10-28-2011, 04:08 PM | #29 |
Gone Wild
Join Date: Aug 2011
Location: Bunnell, Florida
Posts: 2,408
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Re: 1992 EZ GO Marathon
Have someone hold one wheel while you try and spin the other one. If it still turns ( although stiff ) nothing is frozen up. If you don't hold one wheel, it just turns the differential.
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10-28-2011, 04:14 PM | #30 |
Not Yet Wild
Join Date: Oct 2011
Posts: 32
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Re: 1992 EZ GO Marathon
Makes sense. Thanks
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