February 2012 21 – 355
21.2.7 Adjusting the electrical offset (drift adjustment)
Offset adjustment is required or recommendable, if ...
îš„ the error message EXCESSIVE OFFSET <AXIS> is displayed
îš„ the axis or spindle drifts
îš„ the servo lag of the axis at standstill is impermissibly high
îš„ you have exchanged the motor
îš„ you have replaced the carbon brushes
îš„ you have exchanged the analog servo amplifier
îš„ you have replaced cables or electrical lines on the machine
îš„ you have exchanged the CMA-H 04-04-00
Offset adjustment
at the analog servo
amplifier
Below you will find two proposals.
Proposal 1:
8 Set the machine parameters listed below as follows (note down the original values):
• MP1080.x (integral factor): 0 (off)
• MP1391.x, 1392.x (velocity feedforward): 1 (on)
• MP7290.x (display step): 6 (0.1 µm)
8 Switch on the machine.
The axis to be compensated must be in the position control loop. --> If necessary, ask the
machine operator!
Orient the spindle with M19.
8 Select the Programming and Editing operating mode.
8 If open: Close the program management by pressing the END button.
8 Call the code number window..
8 Enter and confirm the code number.
Offset adjustment is only required for analog axes or spindles.
First the analog servo amplifier is adjusted, followed by fine adjustment in the HEIDENHAIN
control.
Analog servo amplifiers are not HEIDENHAIN products.
Follow the instructions of the servo manufacturer (operating instructions, etc.)!
Pressing the MOD key while the program manager is open calls screen where you can make
the interface settings.
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