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03.96
5.2 Power on and power-up
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 Siemens AG 2000 All Rights Reserved
SINUMERIK 840D Installation and Start-Up Guide (IAD) – 04.00 Edition
5.2.1 Power on
The installation should be inspected visually for any obvious faults or defects.
Make sure that the mechanical installation of components is correct and that
electrical connections are firmly in place (e.g. in the DC link). Make sure that all
electrical connections have been made correctly before switching on the power
supply. Please check the supply voltages 230V AC and 24V DC and the
shielding and grounding.
Please perform and check the assignments of the components MCP, HHU, PLC
I/Os as part of the installation procedure.
References: /BH/, Operator Components Manual
The MCP, HHU and MMC components can be switched on in any desired se-
quence if they are physically installed.
Switch on the power supply on all components and on the mains supply mod-
ule. No enabling signals need be present initially on the mains supply module.
However, the LEDs on the mains supply module may not indicate any errors/
faults in the power supply. There are no enabling signals on the MMC modules,
power-up is started immediately.
5.2.2 Power-up
When the power is switched on the control powers up. The system software is
stored on a PCMCIA card on delivery (see Fig. 5-1 for PCMCIA slot, page 5-77).
Note
Power up takes longer than for a standard configuration if modules via L2–DP
and certain FM and CP modules are used.
To bring the control system into a defined initial state, initialization (NCK general
reset) is required when the power is first connected. To execute an NCK reset,
place turn start-up switch S3 on the NCU to position 1 and switch on the control.
The control then powers up, the SRAM memory is erased and the machine data
are preset to the default values.
Visual inspection
Assignments
Power on
sequence
Power on
NCK general reset
5 Power On and Power-Up
05.97
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