CONTREX CXB2040 - Manual (Page 34)

8900 Zachary Lane N., Maple Grove, MN 55369 U.S.A. 31
CHAPTER 6: START UP AND CALIBRATION
6.3 SINE/RESOLVER MODE AMPLIFIER CALIBRATION:
6.3.1 Overview of Potentiometer:
POTS NAME OF POT NOTE
RV2 SIG 1
(Signal 1)
Sets the input voltage to RPM ratio, e.g. 10V=2000RPM (velocity
mode) or input voltage to torque ratio, e.g. 10V=25A (current
mode) required by your system for the single-ended input.
RV3 SIG 2 (Signal 2) Same as Signal 1 input.
RV4 TACH (Tach Gain) Used in conjunction with the compensation to set the system
bandwidth. Not used in current mode. Shipped at 75%.
RV5 BAL (Balance) Used to null any offsets in system.
RV6 COMP
(Compensation)
Used in conjunction with the tach to set the system bandwidth.
Not used in current mode. Shipped set CW (minimum
bandwidth).
RV7 I LIMIT
(Current Limit)
Sets maximum motor current. Shipped set CW (maximum
current).
RV8 LOOP
(Loop Gain)
Used to shut off uncalibrated amplifiers. When the loop gain is
CCW, no current is delivered to the motor. Shipped set CCW
(off).
NOTE: All pots except the Loop Gain are 12-turn.
1. Turn the Current Limit (RV7) to mid position and the Loop Gain (RV8) full CCW.
2. Apply main power and fan power.
3. Slowly turn the Loop Gain (RV8) CW. The Motor should be stopped or turning slowly. If the motor
starts running away, turn Loop Gain (RV8) CCW, switch TACH REVERSE (S1-5) from OFF to ON
(or vice versa) or reverse the TACH OUT and COMMON at J1-5 and J1-6 and retest. Leave the
Loop Gain (RV8) full CW for all remaining adjustments.
4. Slowly move the Balance (RV5) back and forth. Set the Balance midway between the points where
the motor begins turning in either direction.
5. Connect the oscilloscope to ABS I (J1-7) and the battery box to Signal 2 Input. The voltage at J1-7
is a function of motor current: 1V=10A. While applying a step input voltage, adjust the Current Limit
(RV7) 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 Gain (RV3).
6.3.2 Sine/Resolver Mode Amplifier Calibration - Velocity Mode: