Adjusting The Electrical Offset (Drift Adjustment) - HEIDENHAIN iTNC 530 Service Manual

20.2.5 Adjusting the electrical offset (drift adjustment)

An offset adjustment is required or recommendable, in case of the following:
Offset adjustment
at the analog servo
amplifier
Here are two proposals.
Proposal 1:
July 2010
You receive the error message EXCESSIVE OFFSET <AXIS>.
The axis drifts.
The servo lag of the axis at standstill is impermissibly high.
You have exchanged the motor.
You have replaced the motor brushes.
You have exchanged the analog servo amplifier.
You have replaced cables or electrical lines on the machine.
You have exchanged the MC.
Note
The offset adjustment has only to be performed with analog axes.
First the analog servo amplifier is adjusted, subsequently the fine adjustment in the
HEIDENHAIN control is carried out.
Note
Analog servo amplifiers are not HEIDENHAIN products.
Follow the instructions of the servo manufacturer (operating instructions, etc.)!
Set the following machine parameters (note down the original values):
MP 1080.x (integral factor for offset) :
MP 1391.x, 1392.x (velocity feedforward control) :
MP 7290.x (display step) :
Switch on the machine. The axis concerned must be in the position control loop.
--> If necessary, ask the machine manufacturer!
Select the Programming and Editing operating mode.
If open: Close the program management by pressing the END button.
Note
Pressing the MOD key while the program manager is open calls the interface settings.
Call the code number window.
End compensation.
Note
Before the adjustment on the servo amplifier, the fine compensation is cancelled via the
control.
Enter and confirm the code number.
0 (switched off)
1 (switched on)
6 (0.1 µm)
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