LEESON PWM DC Control: 174299 - Manual (Page 23)

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The DECEL setting determines the time the motor takes to decelerate to a lower speed. See
Specifications for approximate deceleration times. The DECEL setting is factory set to its minimum
value (full CCW).
To calibrate DECEL:
1. Set the DECEL trimpot full CCW.
2. Apply power to the drive and turn the main speed adjust potentiometer from full CW to full CCW.
If an input voltage signal is used instead of a speed adjust pot, set the input signal from maximum
to minimum. Note the time that the drive takes to decelerate to the desired speed.
3. Adjust the DECEL trimpot until the desired deceleration time is reached. Turn the DECEL trimpot
CW to increase the deceleration time, and CCW to decrease the deceleration time.
DECELERATION (DECEL)
The IR COMP setting determines the degree to which motor speed is held constant as the motor load
changes. It is factory set for no compensation.
Use the following procedure to recalibrate the IR COMP setting:
1. Set the IR COMP trimpot to minimum (full CCW).
2. Rotate the speed adjust potentiometer until the motor runs at midspeed without load (for example,
900 RPM for an 1800 RPM motor). A hand held tachometer may be used to measure motor speed.
3. Load the motor armature to its full load armature current rating. The motor should slow down.
4. While keeping the load on the motor, rotate the IR COMP trimpot until the motor runs at the speed
measured in step 2. If the motor oscillates (overcompensation), the IR COMP trimpot may be
set too high (CW). Turn the IR COMP trimpot CCW to stabilize the motor.
5. Unload the motor.
IR COMPENSATION (IR COMP)