HEIDENHAIN iTNC 530 Service Manual page 395

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By means of W494 the function of the feed-rate override potentiometer, and by means of

W492 the function of the spindle override potentiometer can be controlled:

Press EMERGENCY STOP.

Activate the HR 420 (press the handwheel symbol on the HR 420).

Activate the handwheel potentiometers (as of NC software version 34049x-xx).

Call the PLC table with the words. --> see "The TABLE Function" on page 10 – 76.

Select the decimal display.

Turn the potentiometer to be investigated.

The value of W492 or W494 changes between 0 and 10000 with nonlinear or between 0

and 100 with linear curve of the potentiometer (the curve is defined in MP 7620 bit 3).

These PLC words can also be shown in the integrated oscilloscope.

--> see "Checking the Potentiometers" on page 22 – 364.

Troubleshooting