CONTREX CXB2040 - Manual (Page 33)

CXB1525 and CXB2040 MANUAL
8900 Zachary Lane N., Maple Grove, MN 55369 U.S.A. 30
CHAPTER SIX: START UP AND CALIBRATION
6.1 INTRODUCTION:
This chapter contains the procedure required to calibrate and set up the amplifier. All adjustments are
made on the pre-amp. Refer to Appendix B, drawing 8000-1430 & 8000-1431 for the sine/resolver
mode.
IF AMPLIFIER IS A REPLACEMENT OR ORDERED WITHIN A KIT,
CALIBRATION IS USUALLY NOT NEEDED.
Calibration requires an oscilloscope, a voltmeter, and a step-voltage source. The step source may be
a flashlight battery or floating power-supply with a series switch. A servo- system calibrator known as a
Battery Box which includes an adjustable bipolar output, reversing switch, and pulse switch will facilitate
calibration and repair. A Battery Box is available from CONTREX, part number BB-700.
Figure 6.1
Critically, Under and Over
damped waveforms
6.2 SAFETY PRECAUTIONS:
Before starting calibration, the following safety precautions should be observed:
1. Check for any loose or damaged components.
2. Check that all connections are tight.
3. Be sure that the motor mechanism is clear of obstructions. If the mechanism has limited
motion, e.g: a lead-screw, set the mechanism to mid-position.
4. Disconnect the signal and auxiliary inputs.
5. Be sure the Loop-Gain pot(s) are fully CCW.
6. Remove input fuses on the baseplate and apply main power. Check for the correct AC voltage at
fuses. The motor supply voltage will be 1.4 times this value. Remove power and reinstall fuses.
7. Work on only one amplifier at a time.