HEIDENHAIN ITNC 530 - Exchange of the MC 422 B, MC 422 C, MC 420

28 – 542 HEIDENHAIN Service Manual iTNC 530
28.4 Exchange of the MC 422 B, MC 422 C, MC 420
Preparing the
machine
If still possible …
8 Move machine to home position (axes, tool changer, tilting head, etc.).
Ask the machine operator!
8 Press the EMERGENCY STOP button.
Backup of
Non-Volatile PLC
Markers and Words
8 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.
Removing the
defective MC 422 B
(MC 422 C, MC 420)
8 Switch off the machine, take precautions against resetting, ensure that the equipment is free
of potential.
8 Label and remove all of the connections on the MC.
8 Loosen two torx screws at the top and two at the bottom of the housing (do not screw off
completely).
8 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.
8 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.)
Mounting the
new MC 422 B (MC
422 C, MC 420)
8 Insert the SIK into the new MC 422 B and lock it. --> See “Exchange of the HDR” on page 28
– 544.
8 Insert the new MC 422 B and screw it into place.
8 If required, remove the protective caps from the MC connectors.
8 Reestablish and screw into place all the connections.
8 Switch on the main switch of the machine.
Setting date and
time on the new
MC 422 B
(MC 422 C, MC 420)
8 Check the date and time of the control and reset it, if necessary. --> See “Setting the System
Time” on page 12 – 159.
Reset non-volatile
PLC markers and
words
8 Restart the control, do not acknowledge the Power interrupted message.
8 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.
Caution
Observe the ESD precautions. --> See “Important Information” on page 28 – 523!
Caution
Do not confuse any of the connectors! Do not forget the grounding screw!