Treadmill PWM Speed Control Failure – Motor Drive Faults
Erratic speed or failure to run? The PWM speed control circuit on your MCB might be the problem. Learn how this critical component fails.
What is PWM and How Does it Control Speed?
A simple explanation of Pulse Width Modulation and how it efficiently controls motor speed by varying the on/off time of the power.
Symptoms of a PWM Circuit Failure
The most common symptoms are totally uncontrolled, full-speed running the moment the safety key is inserted, or a complete failure of the motor to run at all.
Key Components: MOSFETs, IGBTs, and Driver ICs
Identifying the power transistors (MOSFET/IGBT) and the driver chip on the MCB that are responsible for creating the PWM signal.
Diagnosing and Repairing PWM Faults
This section explains that PWM failure is a definitive MCB failure, and while component-level repair is possible for experts, board replacement is the standard fix.