CONTREX CXB2040 User Manual
Page 36
8900 Zachary Lane N., Maple Grove, MN 55369 U.S.A.
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CHAPTER 6: START UP AND CALIBRATION
4. Connect the oscilloscope to ABS I (J1-7), and the battery box to the Signal 2 Single-ended Input (J1-
3 and J1-4). The voltage on J1-7 is a function of motor current: 1V=10A. While pulsing a step input
voltage, adjust the Current Limit for the desired peak current. If the desired peak current cannot be
achieved with the pot full CW, increase the input voltage or increase the Signal 2 Gain (RV3).
5. With battery box still connected at J1-3 and J1-4 for single-ended input (or if your system uses the
differential input, move battery box to J1-1 and J1-2), set the battery box for a known DC voltage.
Apply ± input signal pulses and adjust the Signal 2 Gain pot (RV2) or (RV1 for differential input) to
obtain the desired current gain of the amplifier.
6. If the motor is rotating the wrong direction for a given input polarity, turn the Loop Gain pot full
CCW. Switch MTR REVERSE (S1-4) from OFF to ON (or vice-versa). Turn the Loop Gain pot back
to full CW.
7. Remove battery box, and repeat step 3.
8. Calibration complete. Reconnect signal wires.