Hr 420 Portable Handwheel With Display; Checking The Keys - HEIDENHAIN iTNC 530 Service Manual

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24.2 HR 420 Portable Handwheel with Display

The keys cannot contact any more (defective contact, line, etc.) or are in continuous contact

(adhesion of the key by strong contamination, jammed chips, etc.).

With the PLC diagnostic functions TABLE or LOGIC DIAGRAM you can check the function of

many handwheel keys my means of the corresponding PLC markers:

MP7641 defines if a HR 420 with or without detent is used or if the keys on the handwheel are

evaluated by the NC or the PLC.

All keys are evaluated by the NC. Certain keys are mapped on markers.

Keys that are not mapped in markers can be checked easily by controlling if a function is called

by pressing the corresponding key or if there is a reaction on the screen.

Press EMERGENCY STOP.

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

Call the table with the PLC markers and start the logic diagram. --> see "PLC Diagnosis" on

page 10 – 73.

Press the handwheel keys.

Check whether the corresponding markers are set.

Only if M4660 is set (HR 420 active), other markers can be set or reset.