MANUAL# 5005-2040-000-F UPDATED: 6/1/2021
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9
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Pulse the input and compare the waveform with figure B.
10. Adjust the Compensation pot (RV3) CCW until the waveform is critically damped or one hook
overshoot. If the desired waveform cannot be obtained by adjusting the Compensation pot
before the motor becomes unstable, back off the Tach. Gain pot (CCW) a few turns.
11. Do not adjust the Tach. Gain or Compensation for the rest of the calibration procedure.
12. Set battery box for a known DC voltage (+/-10V). Adjust the Signal Gain pot (RV1) and set the
ratio based on the desired motor velocity.
13. Calibration complete.
14. Now connect the computer control (CNC). If the motor is rotating in the wrong direction for a
given input polarity, power down. Reverse both the motor and Tach. leads.
Figure B - Critically damped, One Hook Overshoot, Under and Over damped waveforms