Operating instructions
Table Of Contents
- Mart Cart Model 3563 Technical Overview
- Table of Contents
- Major Parts Overview
- Battery/Circuit Breaker
- Charger
- Wire Harness
- PWM
- Control Box
- Hub Motor
- Potentiometer/PWM Relationship
- Potentiometer/PWM Relationship
- Calibrate PWM
- Calibrate PWM – Check Brake Leads
- Parts List
- Parts List – Steering Column
- Wiring Diagram
- Tools
- Safety Check
- Warranty
- Serial Number Label
- Mart Cart End Technical Overview
Return to Table of Contents
Potentiometer/PWM
Relationship
Over the life of the cart, several things may happen to disrupt the normal resistance between the
pot and the PWM…subsequently sending false readings to the PWM. They are:
• The resistance material in the pot becomes damaged (extremely rare).
• The shaft sticks/freezes (human error during assembly).
• The spring or fork of the pot assembly become damaged.
• The connectors of the steering wire harness loose contact.
• The wires of the steering wire harness break.
When any of these situations occur, the PWM (movement of the cart) may act erratically. Often, the
PWM is diagnosed as having a problem when, in fact, a problem exists with the pot, connectors, or
wire harness.
The PWM is “calibrated” (see next page “Calibrate PWM”) at the factory to the neutral range of the
pot. If the pot assembly or wires become damaged, the resistance (and neutral range) of the pot
can change. Re-calibrating the PWM may resolve the immediate problem but the fix may not be
permanent. The best practice is to validate the condition of the pot, connectors, and wire harness
before attempting to re-calibrate the PWM.