06-03-2021, 10:46 AM | #21 | |
Gone Wild
Join Date: Feb 2007
Posts: 176
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Re: Question
Quote:
Strange how with a diode the car will move until it blows. Is that because the car is trying to bypass the bad “throttle switch contact in the controller”, and run the entire car by sending the amps through a bypass, ala the diode? |
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06-03-2021, 11:41 AM | #22 | |
Techno-Nerd
Join Date: Jun 2011
Location: West Virginia
Posts: 19,654
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Re: Question
Quote:
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06-03-2021, 12:03 PM | #23 | |
Gone Wild
Join Date: Feb 2007
Posts: 176
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Re: Question
Quote:
I’ll charge it as perhaps the controller was programmed for the bottom voltage to be fairly high, as that’s the only other difference besides the diode being off the solenoid when I jumped it. I didn’t grab my laptop on the way out today so I’ll see about bringing it in tomorrow. |
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06-03-2021, 01:28 PM | #24 |
Gone Wild
Join Date: Feb 2007
Posts: 176
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Re: Question
Not sure if it helps any, but when I press the pedal down the controller side of the solenoid will drop to 28v and lower.
After charging the car, I jumpered the solenoid again, and the vehicle moves now. |
06-03-2021, 04:56 PM | #25 | |
Techno-Nerd
Join Date: Jun 2011
Location: West Virginia
Posts: 19,654
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Re: Question
Quote:
When you measure the voltage on the solenoid's controller side large terminal, you are effectively measuring the voltage on about a Farad of capacitors located between the controller's B- and B+ terminals. During normal operation, the battery pack is connected to these capacitors via the solenoid's closed contacts, so the amps drawn by the motor are replenished almost as fast as the motor can draw them. When the solenoid contacts are not closed, the capacitors are charged via J1 Pin-5 at a much slower rate since there is a current limiting resistor between J1 Pin-5 and the capacitors. When the solenoid doesn't click (close the contacts) the motor draws amps faster then J1 Pin-5 can replenish them very fast, so the voltage at the B+ terminal drops, eventually down to nearly 0V. |
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06-03-2021, 08:25 PM | #26 | |
Gone Wild
Join Date: Feb 2007
Posts: 176
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Re: Question
Quote:
Oh wonderful explanation thank you so much! That makes sense and is easy to understand! I suspect I should dig up the floorboard and test the accelerator microswitch in this case? |
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06-04-2021, 08:57 AM | #27 |
Gone Wild
Join Date: Feb 2007
Posts: 176
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Re: Question
I was also curious, is there a way to tell if a solenoid is polarized by its appearance, or is it just knowledge of brands and type?
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06-04-2021, 10:01 AM | #28 |
Gone Wild
Join Date: Feb 2007
Posts: 176
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Re: Question
Pulled up the floor and tested the ACC microswitch. I have continuity when the switch is closed. I’m getting 2.14v into the switch as well, measured between the red and green microswitch wires. I tested the key switch and it has battery pack voltage on both sides when in the on position. Checked the rocker switch FNR and it had 1.2v on the orange wire (forward) reverse does not work.
Not sure what I’m missing |
06-04-2021, 12:01 PM | #29 | ||
Techno-Nerd
Join Date: Jun 2011
Location: West Virginia
Posts: 19,654
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Re: Question
Quote:
Quote:
Attached is a drawing showing the control voltage paths to and from the switches and through the stock PDS controller, plus an edited version of that drawing with the suspected voltage paths through the PDS version of the XCT controller (Keyswitch does not loose power when F/R is in N). In either case, the pedal switch input is in parallel with the yellow wire on the solenoid coil. So if you're getting full pack voltage on the yellow wire, and not on the pedal switch input, the problem is narrowed down to J4 pin/jack connections, one wire and its connections at the switch. Also attached are continuity check for an XCT-PDS. |
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06-04-2021, 01:29 PM | #30 |
Gone Wild
Join Date: Feb 2007
Posts: 176
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Re: Question
I had pack voltage going into the pedal switch. I measured the red and green wires with the negative probe on the green pedal switch wire and the positive probe on the red wire and tats how I got the 2.4v measurement. I do get pack voltage in on the red wire and then after microswitch activation I get pack voltage on the green wire as well. So I’m getting pack voltage through the pedal switch.
I do see a lot of corrosion on the 10 pin connector and the controller as well. |
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