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This chapter will cover the steps necessary to correctly adjust an LX drive. In some
cases the most accurate adjustment requires some test equipment such as an
oscilloscope, tachometer or a voltmeter. The type of test equipment required is
dependent on the type of controller that is employed and the level of calibration
accuracy required for the application.
5.1
Drive Calibrations
ZERO OFFSET
Ø
CAL SPEED
Ø
RESPONSE
Ø
ACC/DEC
Ø
GAIN
Ø
NOTE: THE PERSONALITY BOARDS FOR THE DIFFERENT
SIZE LX AMPLIFIERS ARE NOT ALL IDENTICAL
1
A select resistor soldered into a header on the personality board is installed at the
factory which sets the gain windows for the range of motors normally used on that
amplifier.
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5
START UP / CALIBRATION
Allows adjusting for input voltage offsets in the speed command
signal at zero speed (± 130 mV) to eliminate drift.
Adjusts the full scale speed command sensitivity. At fully CCW
the max speed will be achieved at 13 VDC command. At fully
CW the max speed will be achieved at 7 VDC command. The
speed range is set by dip switch SW1/1 - 3000/6000 RPM.
Adjusts the derivative action. Turn CW to reduce the overshoot
and increase the PID filter derivative action. Too high an
adjustment will result in a high frequency oscillation on the
motor shaft and the possibility of overheating the motor. Too
high a setting will increase settling time to speed changes. Too
low a setting will result in slow response to load changes and
overshoot during quick speed changes.
Sets the motor acceleration/deceleration gradient. The range of
adjustment allows ramping to max. speed in 0-1 sec. with a ± 10
volt signal applied. Normal servo application requires full CCW
adjustment (zero ramping time).
Proportional velocity gain control. Turn CW to increase the PID
filter proportional action. Too high an adjustment will cause a
medium frequency vibration on the motor shaft and possibility of
overheating a motor.
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Section 5– Page 1
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