2007 Ez-Go TXT, PDS 36 volt - Complete Upgrade to 48 volt - BUILD

[JohnnieB]

Originally Posted by bubba4dad

I’ve hit my next hurdle.

On my original solenoid there was a resistor across the two large posts. The new solenoid came with a diode jumper. For the 48 volts, do I need the resistor, diode, neither, or both?

You need a diode across the large terminals. (The banded end facing the cable from the main positive terminal on the battery pack)

It is called a Regen Diode and its purpose is to prevent the controller from being hit with an abnormally high voltage if the solenoid de-energizes while regen braking is occurring.

[bubba4dad]

What was the purpose of the 250 ohm resistor on the old solenoid?

[JohnnieB]

Originally Posted by bubba4dad

What was the purpose of the 250 ohm resistor on the old solenoid?

It kept the huge filter capacitors in the controller charged up to a few volts shy of the battery pack voltage so the solenoid contacts didn't arc as much as they bounced their way closed, prolonging their usable lifespan.

This task is done via J1 Pin-5 on the XCT.

[bubba4dad]

Do I need a diode across the small (coil) terminals on the solenoid? All of the wiring diagrams show a MR754 diode. I didn’t have one before and I don’t have one to put there?

[bubba4dad]

Got it all correct the first time.....Ran good.

Scottyb I do have a question. Is the new Alltrax controller pre programed for the ML3 switch? I tried all three positions and the top speed is the same with all three. 28.4 mph.

It doesn't appear that it got programed prior to sending to me. How do I get the program so I can program it myself?

[VanillaXtract]

Originally Posted by bubba4dad

Got it all correct the first time.....Ran good.

Scottyb I do have a question. Is the new Alltrax controller pre programed for the ML3 switch? I tried all three positions and the top speed is the same with all three. 28.4 mph.

It doesn't appear that it got programed prior to sending to me. How do I get the program so I can program it myself?

Assuming you're familiar with the program itself, I used the programming found here. Don't forget to set the user input to FNKS.

[bubba4dad]

I do not have any experience doing this. On their website it says it would be programed prior to shipping.

I am sure I can figure it out is I can get the program to load on my laptop.

[JohnnieB]

The top speed of 28.4 MPH is a combination of what the max motor RPM is set for in the XCT, the gear ratio in the differential and the tire height.

Scotty probably set the XCT for a 6000RPM max and unless you've changed the stock gears, they are 12.44:1, so your tires are about 21.5" tall, but they look like off-road tires, so they might be a bit taller.

What is your tire height?

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After you get Toolkit loaded on your laptop, keep it connected while driving cart and save a datalog as a .csv file (comma separated values), zip it and attach it to a post. I'd love to see how a B2 motor performs.

[bubba4dad]

the tires are 23".

The problem I have is that all three switch positions on the ML3 give me the same result.

[JohnnieB]

Originally Posted by bubba4dad

the tires are 23".

The problem I have is that all three switch positions on the ML3 give me the same result.

Could be because the Speed Limit (max RPM) is set to the same value for all three users, or it could be the motor will only spin 5200RPM with a 48V battery pack when turning 23" tires.

Get the laptop connected and look at how the different users are programmed.