Error Location On Portable Handwheel With Hr 420 Display - HEIDENHAIN iTNC 530 Service Manual

24.3 Error Location on Portable Handwheel with HR 420 Display

If you suspect that a damaged handwheel or a handwheel into which liquid has penetrated
Control impaired?
impairs the function of the control:
Visual inspection
Examine the device for damage: Are keys heavily contaminated? Are there any jammed chips?
Have liquids entered, etc.?
Functional check
The HR 420 is powered by the MC with +12 V voltage at connector X23.
Power
supply OK?
If you have a test adapter, you can use it to check, whether the power supply is okay:
July 2010
Disconnect the handwheel and observe the reaction. --> See "Deselecting and Disconnecting
the Portable Handwheel" on page 24 – 409.
Visually inspect the HR, EMERGENCY STOP button, keys, cable, contacts, etc.
Switch on the machine.
Select the El. Handwheel operating mode.
Set the control display to NOML.
Observe whether this display changes, while turning the handwheel.
Check, whether the EMERGENCY STOP button and all other keys function properly.
Note
If available, connect an identical handwheel and test its function.
Connector X23 on the MC
Pin 2
Pin 4
Shut down the control and switch off the machine.
Connect the test adapter between connector X23 of the MC and handwheel (See "Test
Adapter" on page 29 – 562).
Switch on the machine.
Measure, whether there are +12 V between pin 2 and pin 4.
Caution
The power supply of the handwheels is not monitored.
A defective handwheel or a handwheel with penetrated humidity may influence the 12 Vdc
supply voltage of the control. This can lead to various disturbances of the control, even to a
black screen. It is possible that also error messages are displayed that do not immediately
refer to a defective handwheel.
In this case try to operate the control without handwheel (See "Deselecting and
Disconnecting the Portable Handwheel" on page 24 – 409) to find out whether the
disturbances and error messages mentioned still are generated on the machine.
Pin layout
0 V
+ 12 V
24 – 401