February 2012 25 – 413
25.7 Error diagnosis of HR 130 panel-mounted handwheel
Control impaired? If you suspect that a damaged handwheel or a handwheel into which liquid has penetrated impairs the
function of the control:
8 Disconnect the handwheel and observe the reaction.
Visual inspection 8 Start with a visual inspection!
Is there any damage, have liquids penetrated, etc.?
Functional check
8 Switch on the machine.
8 Select the Elec. Handwheel operating mode.
8 Set the position display of the control to NOML.
8 Observe whether this display changes, while you turn the handwheel.
Power supply OK? The HR 130 panel-mounted handwheel is powered by the MB 620 or the HSCI adapter PLB 6001 with
+12 V at connector X23.
If you have a test adapter, you can use it to check whether the power supply is OK:
8 Shut down the control and switch off the machine.
8 Unfasten the mounting screws of the machine operating panel.
8 Lift out the machine operating panel until you can disconnect the connector X23.
8 Connect the test adapter between the handwheel and the connector X23 of the machine operating
panel. (See ”Test adapter” on page 30 – 560.)
8 Switch on the machine.
8 Measure, whether there are +12 V between pin 2 (0 V) and pin 4 (+12 V).
Connector X23 on MB 620 or HSCI adapter PLB 6001 Assignment
Pin 2 0 V
Pin 4 + 12 V
The MB 620 and the HSCI adapter PLB 6001 feature "polyfuses“.
Polyfuses are electronic fuses that become highly resistive if an overload occurs and thus
separate defective peripherals (e.g., handwheel) from the low voltages of the MB 620 or the
HSCI adapter PLB 6001.
Polyfuses have a self-resetting function ("self-healing effect").
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