Exchange Of The Mc 422 B, Mc 422 C, Mc 420 - HEIDENHAIN iTNC 530 Service Manual

28.4 Exchange of the MC 422 B, MC 422 C, MC 420

If still possible ...
Preparing the
machine
Backup of
Non-Volatile PLC
Markers and Words
Removing the
defective MC 422 B
(MC 422 C, MC 420)
Mounting the
new MC 422 B (MC
422 C, MC 420)
Setting date and
time on the new
MC 422 B
(MC 422 C, MC 420)
Reset non-volatile
PLC markers and
words
28 – 542
Move machine to home position (axes, tool changer, tilting head, etc.).
Ask the machine operator!
Press the EMERGENCY STOP button.
Back up the condition of non-volatile PLC markers and words from RAM to the HDR. --> See
"Non-Volatile PLC Markers and Words" on page 11 – 136.
Switch off the machine, take precautions against resetting, ensure that the equipment is free
of potential.
Label and remove all of the connections on the MC.
Loosen two torx screws at the top and two at the bottom of the housing (do not screw off
completely).
Remove the defective MC by drawing it towards you by the handles until the MC disengages
from the CC. Now you can pull out the MC at a slight angle to the right.
Caution
Observe the ESD precautions. --> See "Important Information" on page 28 – 523!
Remove the HDR incl. SIK (hard disk removable).
--> See "Exchange of the HDR" on page 28 – 544.
(The SIK to the machine is located in a plug-in slot in the HDR housing.)
Insert the SIK into the new MC 422 B and lock it. --> See "Exchange of the HDR" on page 28
– 544.
Insert the new MC 422 B and screw it into place.
If required, remove the protective caps from the MC connectors.
Reestablish and screw into place all the connections.
Caution
Do not confuse any of the connectors! Do not forget the grounding screw!
Switch on the main switch of the machine.
Check the date and time of the control and reset it, if necessary. --> See "Setting the System
Time" on page 12 – 159.
Restart the control, do not acknowledge the Power interrupted message.
Write the non-volatile PLC markers and words from the HDR to the RAM of the new control.
--> See "Non-Volatile PLC Markers and Words" on page 11 – 136.
HEIDENHAIN Service Manual iTNC 530