Minarik PCM21000A, User Manual

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28 Calibration
7. Set the speed adjust potentiometer or reference signal to zero
speed.
8. Remove power from the drive.
9. Remove the lock from the motor shaft.
10. Remove the ammeter in series with the motor armature.
REGULATION (IR COMP)
The IR COMP trimpot setting determines the degree to which
motor speed is held constant as the motor load changes. It is
factory set for optimum motor regulation. To calibrate IR COMP
(exact calibration):
1. Turn the IR COMP trimpot full CCW.
2. Set 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.
Approximate calibration:
If the motor does not maintain set speed as the load changes,
gradually rotate the IR COMP trimpot CW. 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
speed.
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