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5.2 Power on and power-up
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SINUMERIK 840D Installation and Start-Up Guide (IAD) – 04.00 Edition
5.2.4 Error during control power-up (NC)
Various status messages are output via status display H3 (see Fig. 5-1, page
5-77) during power up. The digit “6” is output when the control has finished pow-
ering up.
If the digit “6” is not output after approximately 2 minutes, but:
S another number appears,
S the display remains dark,
S the display flashes,
then proceed as follows:
1. Repeat the NCK general reset process.
2. Switch S3 (NCU) must be reset to “0”.
3. If the NCK general reset does not work, replace the PCMCIA card.
4. If none of these measures work, the NCU module must be replaced.
Status display H3
(7-segment
display)
Problems during
NCK power-up
5 Power On and Power-Up
07.98
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