20 – 352 HEIDENHAIN Service Manual iTNC 530
20.2.6 Speed adjustment at the servo amplifier (tachometer adjustment)
Speed adjustment at servo amplifier needs to be carried out in case of the following:
You have updated the mechanics of the axis.
(e.g., guideway, bearing, belt, coupling, ball screw, etc.)
You have exchanged the analog servo amplifier or the motor.
You have replaced the motor brushes.
The servo lag is impermissibly high at constant traverse.
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).
Suggestion how
to perform the
adjustment
Below you find a proposal:
8 Set the following machine parameter (note down the original value):
MP 7290.x (display step) : 6 (0.1 µm)
8 In the machine parameters MP 1391.x and MP 1392.x you can see whether the axis is
operated with following error or feedforward control.
8 Switch the position display to LAG.
8 Enter the following test program (e.g., for X axis, choose a larger traverse range if necessary):
8 Set the feed rate potentiometer to zero.
8 Run the program in the Program Run, Full Sequence operating mode and turn the feed rate
potentiometer slowly to 100 %.
This adjustment is only necessary for analog axes!
Before the speed adjustment, the offset adjustment for the axis concerned should be
performed. --> See “Adjusting the electrical offset (drift adjustment)” on page 20 – 349.
Analog servo amplifiers are not HEIDENHAIN products.
Follow the instructions of the servo manufacturer (operating instructions, etc.)!
0 BEGIN PGM tacho_adjustment X MM
1 LBL 1
2 L X + 0 F MAX
3 L X + 300 F MAX
4 CALL LBL 1 REP 100
5 END PGM tacho_adjustment X MM
Enter this test program together with the machine operator. Please be careful to prevent a
collision (retract Z axis first, etc.)!
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