Club Car DS 2002 48v

[Sergio]

The voltage from M- to B- is a result of the Controller PWM and I cannot think how the motor could affect the ability of the Controller to bring M- to B-.

The issue to me is in the Controller specially if the throttle signal is not changing.

Maybe someone else has an idea, I cannot think of another one at the moment.

[NoleFan4Ever]

Originally Posted by Sergio

The voltage from M- to B- is a result of the Controller PWM and I cannot think how the motor could affect the ability of the Controller to bring M- to B-.

The issue to me is in the Controller specially if the throttle signal is not changing.

Maybe someone else has an idea, I cannot think of another one at the moment.

Whole heartedly agree....

[Mtc0812]

Originally Posted by Sergio

The voltage from M- to B- is a result of the Controller PWM and I cannot think how the motor could affect the ability of the Controller to bring M- to B-.

The issue to me is in the Controller specially if the throttle signal is not changing.

Maybe someone else has an idea, I cannot think of another one at the moment.

Sounds plausible, but how would the controller know if the cart was moving or not? I can get the same results every time I push the throttle. If I want to go fast, I stop the cart completely, then punch the gas. The problem is I have to let off the throttle eventually to turn, but when I reapply the throttle, while the cart is moving, , it doesn’t have full power anymore. I’m not sure how the controller would know this without getting feedback through the motor being engaged

[Sergio]

The dynamics inside the Controller are very different in those scenarios.

When the Controller is at 100% PWM, the M- terminal is directly connected to the B- terminal and current flows uninterrupted through the system.

When the Controller is at less than 100% PWM and the FET that switches M- to B- opens, the current stored in the Motor winding continues to flow through the flywheel circuit from M- to B+

The pre-charge resistor does not look burnt so I don't think it is a Solenoid issue.

I am guessing either the FET or the flywheel circuit is damaged and when the PWM increases gradually it is causing an issue inside the Controller.

[Mtc0812]

Sounds good! Thank you for all the help!