HEIDENHAIN ND 1300 CNC Setup - Manual (Page 36)

2
Drift test
Servo amplifier systems often require adjustment to minimize or eliminate amplifier offset
output voltages that can lead to offset (unbalanced) stage positioning around target locations.
The drift test facilitates amplifier offset adjustment by applying zero volts to the amplifier
input. The test is performed as follows:
• Touch the Drift test button
• Adjust the amplifier offset potentiometer to achieve a Current
voltage reading as close as possible to zero
NOTE
Output balancing is part of the PID loop tuning procedure provided later in this
chapter. Drift testing and offset adjustment is necessary only when the servo am-
plifier output offset is so high that the loop tuning procedure is unable to achieve
adequate output balancing and target positioning.
CNC Setup and PID Loop Tuning Guide