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IR POTENTIOMETER ADJUSTMENTS, PWM ONLY:
IR = I (amperage) R (resistance)
The IR potentiometer that is located next to the MAX speed potentiometer on the PWM motor control
board is used to adjust the time it takes the pwm to react to a load or amperage spike. When the user
steps onto the treadbelt a load is introduced to the system which creates an amperage spike. The
pwm board senses this amperage spike and reacts by feeding more power to the drive motor. This
“more power” compensates the amperage spike (load) and the treadmill does not slow down. If the IR
was adjusted to react slowly the user would notice a lag in belt movement when stepping onto the
treadbelt. If the IR was adjusted to react too quickly the user would notice a quick surge when
stepping onto the treadbelt. Either way, the treadmill will surge considerably when this occurs. There
have also been isolated cases where the treadmill will surge without a user walking on it. When this
occurs, the red light on the pwm (LED1) will flash in sequence with the belt surge.
To adjust the IR potentiometer:
No load / belt surging / LED1 flashing = use a small screw driver to rotate IR pot. Make this
adjustment while the treadmill is running (surging). Rotate the pot in small increments until the
treadmill surge subsides and runs smoothly.
NOTE: the IR pot can be rotated Clockwise or Counter Clockwise to achieve smooth operation.
With load / belt surging / LED1 may be flashing = use a small screwdriver to rotate IR pot. Make this
adjustment while the user is walking on the treadmill. Rotate the pot in small increments until the
treadmill surge subsides and runs smoothly. Keep speed setting under 2.0mph for safety.
NOTE: the IR pot can be rotated CW or CCW to achieve smooth operation.