Minarik NRG-2Q Series, User Manual

Page: 36 / 60

30 Calibration
REGULATION (IR COMP)
The IR COMP setting determines the degree to which motor
speed is held constant as the motor load changes. It is factory set
for optimum motor regulation at maximum rated current.
To calibrate IR COMP (exact calibration):
1. Turn the IR COMP trimpot full CCW.
2. Set the speed adjust potentiometer or voltage input signal until
the motor runs at midspeed without load (for example, 900
RPM for an 1800 RPM motor). Use a hand held tachometer 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.
See Figure 9, page 34 for recommended IR COMP trimpot
settings.
250-0246r2_readers.qxd 6/7/01 10:51 AM Page 30