Treadmill motor replace | how to set IR, SPEED, Torque on Motor Board

Turn IR and LIMIT (also called TORQUE) clockwise or counterclockwise for half scale every time to get higher or less torque.

SPEED: it is used to set up the rapport between
the signal coming from console to motor controller
AND the voltage to the motor (i.e. signal 5V from console to MCB = 140 V may become 5V from console -> 180V to the motor)

You don't usually need to set SPEED. The sensor (REED or optic) on the treadmill gives a feeedback to the console and the console adjust the signal to the MCB until the correct speed has been reached.