SMA5005 & SMA5015 MANUAL
MANUAL # 5005-2040-000-F UPDATED: 6/1/2021
8. Connect oscilloscope probe to J1-5 (TACH INPUT) and oscilloscope ground to J1-11
(COMMON). Set battery box for a DC signal output to obtain approximately 400RPM. The RPM
may be set by measuring the Tach. voltage at J1-5, e.g., 2.8VDC for a 7V/KRPM Tach. is
400RPM.
9. Pulse the input and compare the waveform with figure C.
10. Adjust the Compensation pot (RV5) 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 AUX. Gain (RV1) pot for
differential Gain or SIG. Gain (RV2) for single-ended input to 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 C - Critically damped, One Hook Overshoot, Under and Over damped waveforms
