Speed Adjustment At Servo Amplifier (Tachometer Adjustment) - HEIDENHAIN iTNC 530 Service Manual

20.2.5 Speed Adjustment at Servo Amplifier (Tachometer Adjustment)

General Speed adjustment at servo amplifier needs to be carried out in case of the following:
The aim of speed adjustment is to achieve that the output nominal speed value is equal to the
really measured actual speed value (Vnom = Vact).
Execution Analog servo amplifiers are no HEIDENHAIN products.
Follow the instructions of the servo manufacturer (operating instructions, etc.)!
Here is a proposal:



0
1
2
3
4
5



LAG [mm] =
May 2006
You have updated the mechanical design of the axis
(e.g., guideway, bearing, belt, coupling, ball screw, etc.)
You have exchanged the servo amplifier or the motor
You have replaced the motor brushes.
Servo lag at constant traverse is impermissibly high
Note
Adjusting only needs to be carried out with analog axes.
Check or set the following machine parameter (if you change the machine parameter, please
take note of the original input values).
MP 7290.x (display step) : 6 (0.1 µm)
Switch position display to LAG.
Enter the following test program (e.g. for X axis,select a larger traverse range than indicated
in example X + 100)
DANGER
Enter this test program with the machine operator. Please be careful to prevent a collision
(retract Z axis first, etc.)!
BEGIN PGM tacho_adjustment X MM
LBL 1
L X+ 0 F MAX
L X + 100 F MAX
CALL LBL 1 REP 100
END PGM tacho_adjustment X MM
Set the feed rate potentiometer to zero.
Run the program in the Program Run, Full Sequence operating mode and turn the feed rate
potentiometer slowly to 100 %.
Adjust tachometer generator at the servo amplifier using the servo lag display as follows:
For operation with velocity feedforward control, adjust the servo lag display
to 0 (ideally).
For operation with servo lag, adjust the servo lag display as follows:
Traversing speed
--------------------------------------------------------- -
kv-Faktor
m
-------- -
min
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