91 Marathon - Possible to adjust throttle POT?

[BLK MAJK]

Hello all,

I am working on a lithium upgrade on my cart and I'm at the 2 yard line and ran into an issue. Specs of system:

91 Marathon - Series Cart with stock potentiometer throttle input
7 cell lithium leaf pack currently reading 57VDC
Sergios HV/LV relay setup with Chinese BMS
Alltrax SR48400
HD F&R switch
400A Solenoid
All new wiring

I tried to fire it up for the first time yesterday and I'm getting a fault on the controller. 2 green, 3 red, which correlates to "High Throttle Over Range". So, I pulled the black/white wires from the pot and hooked them to my meter. I'm expecting a 0-5k signal, but actual readings are 2.0-7.1 . I assume this is my issue. What's weird is that before I replaced all of these components, the cart ran perfectly fine with the 6x6 batteries and the stock controller. Is there a way to adjust that pot to bring it back into range? If I put it in neutral, the fault clears and on the Alltrax software throttle page I can see the green bar move with pedal input, so I know its getting an input. Any help is appreciated! I'm ready for this thing to tear it up!

[scottyb]

You can depending upon the model loosen the pivot shaft arm and carefully turn the shaft counterclockwise about 5-10º. Tighten the clamp and retest.
Ideally you should get between 200-400 at the low end and no more then 6000 at the top but note that 4600 is enough to yield a full throttle response.

[BLK MAJK]

Not sure if it helps, but here is a picture I took while tearing things down. It looks like I may be able to adjust what you say. I assume the item circled it what you are talking about?

[JohnnieB]

Here's a couple of things that may help.

[BLK MAJK]

Originally Posted by JohnnieB

Here's a couple of things that may help.

awesome info! Thank you. Now I'm counting the minutes until I can leave work and hopefully take it for it's maiden voyage!

[BLK MAJK]

Ok, now I'm getting frustrated. Came home from work, adjusted the throttle arm and dialed in the pot.

Pedal up - 1.0 ohm
Pedal down - 4.885 Kohm

Should be just about perfect. Controller still throws same error. As soon as I turn the key on, the monitor throws a fault. When I check the monitor screen I have 3 red items.

- Low Throttle Input Over Range
- High Throttle Input Over Range
- Shutdown (I assume this is because of the other 2 faults)

I just don't understand how the controller can throw a high throttle input over range as soon as I turn the key on. I double checked the throttle input and it is set for 0-5k 2 wire.

Any ideas? I'm hoping it's not a bad controller.

[JohnnieB]

Have you tried clearing the Auto-Cal?

IIRC - Right click on Controller tab to get to it.

[BLK MAJK]

Originally Posted by JohnnieB

Have you tried clearing the Auto-Cal?

IIRC - Right click on Controller tab to get to it.

@JohnnieB

Just tried that. Still same faults

[JohnnieB]

Originally Posted by BLK MAJK

@JohnnieB

Just tried that. Still same faults

Time to contact Alltrax.

[BLK MAJK]

Originally Posted by JohnnieB

Time to contact Alltrax.

Great. Thanks for the help, I appreciate it.