February 2012 25 – 407
All keys are evaluated by the NC. Certain keys are mapped to markers.
Keys that are not mapped to markers can be checked easily by verifying whether a function is called
by pressing the corresponding key or whether there is a reaction on the screen.
Checking the
potentiometers
The potentiometer setting is shown in the following PLC words:
W492 (= S override)
W494 (= F override)
8 Switch on the machine.
8 Press the EMERGENCY STOP button.
8 Activate the HR 520 (press the handwheel symbol on the HR 520).
--> The window Handwheel active appears on the screen.
8 Activate the handwheel potentiometers (see next page).
8 Call the PLC table for the words. --> See ”The TABLE function” on page 11 – 119.
8 Place the cursor on W492 or W494.
8 Select decimal display (soft key HEX<->DECIMAL).
8 Turn the potentiometer to be examined.
8 Check whether the display changes from 0 to 10000 (with nonlinear characteristic curve)
or from 0 to 100 (with linear characteristic curve).
The characteristic curve is defined in MP7620, bit 3.
F1 F2 F3 F4 F5
XYZ
IV V VI
↑ Handwheel
active
(M4660)
↓
–
(M4667)
Rapid
traverse
(M4663)
+
(M4666)
Spindle
start
(M4664)
Actual
position
capture
NC start
(M4661)
Spindle
stop
(M4665)
CTRL
(M4668)
NC stop
(M4662)
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