Checking The Potentiometers - HEIDENHAIN iTNC 530 Service Manual

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22.5 Checking the Potentiometers

Potentiometer

You can use the PLC table to determine whether the control receives the potentiometer signal.

values in the

The potentiometer setting is shown in the following PLC words:

Proceed as follows:

Potentiometer

With the integrated oscilloscope you can also record the condition of PLC words.

-> see "Integrated Oscilloscope" on page 8 – 49.

values in the

oscilloscope

The advantage of this method is that possible wiper interruptions of the potentiometers can be

recognized better than in the PLC TABLE.

For this investigation the machine must be switched on completely!

W492 (=S override)

W494 (= F override)

Press EMERGENCY STOP.

Call the PLC table for the words (see "The TABLE Function" on page 10 – 76).

Place the cursor at W492 or W494.

Select the decimal display.

Turn the potentiometer to be examined.

Check if the display can be changed from 0 to 15000 (with nonlinear characteristic curve)

or 0 to 150 (with linear characteristic curve).

The characteristic curve is defined in MP 7620 bit 3.

HEIDENHAIN Service Manual iTNC 530