5
03/2006
5.4 Power-On and Power-Up
5-44
© Siemens AG 2006 All Rights Reserved
SINUMERIK 840D/810D Start-Up Guide (IADC) – 03/2006 Edition
5.4.3 PCU power-up
After the power supply has been switched on, the PCU powers up automati-
cally. The system software is installed in the factory and is ready to run. The
basic display appears on the screen if the MMC has powered up successfully.
PCU 20
If the PCU is unable to establish a connection to the NCK, the message “wait
for NCU-connection:“x” seconds”, “x” = 1 to 60 appears. If no connection is
established after this time, the PCU is quickly rebooted.
Check the following:
S Is the NCU module on standby?
(number 6 on H3)
S Is the MPI cable inserted, is cable attached properly to connector?
S Are other MPI stations (machine control panel, handheld unit, ...) disturbing
MPI communication? (Remove connections to test.)
S If the reset button on the NCU was pressed again during power-up (e.g. as
for software upgrade [Position 1/PLC Reset]), the control must be switched
off and on again for the PCU power-up to be successful.
PCU 50/50.3/70
If the PCU does not power up and the screen remains dark, then check the
24 V DC power supply. If the power supply at the PCU’s power supply unit is
correct and the 7-segment display on the back remains dark, then the PCU is
faulty.
If the PCU powers up, but is unable to establish a connection to the NCK, then
the message “Communication with NCK failed” appears in the bottom message
line.
In this case, please check the following:
S Is the NCU module on standby (number 6 on H3)?
S Is the MPI cable inserted, is cable attached properly to connector?
S Is the baud rate in menu Start-up/HMI/operator panel front set correctly? It
must be set to 187.5 (password for protection level 2 required).
S Are other MPI stations (machine control panel, handheld unit, ...) disturbing
MPI communication? (Remove connections to test.)
PCU power-up
Problems during
power-up
5 Power-On and Power-U
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