Installation
3.3 Power supply of the Industrial PC
The Industrial PC is optionally fitted with a 24 V
DC
power supply unit .
Uninterruptible power supply (UPS)
Note
When the Industrial PC is provided with a power supply unit with integrated UPS (order
option) you can realize an uninterruptible power supply (UPS) using the battery pack
C9900-U330 or C9900-U332.
Danger of Explosion!
WARNING
Danger of Explosion if using other battery packs!
3.3.1 Beckhoff power supply technology
Schematic diagram of
power supply unit wirings
Industrial PCs equipped with a UPS are in actual use frequently switched off by simply turning off the
supply voltage. In this case the PC shuts down via the battery. However, over time this reduces the
service life of the battery.
The new Beckhoff power supply technology approach addresses this problem and now offers the user the
option of switching the PC off without the need for using the battery, thereby reducing the load on the
battery.
In addition to the main switch this innovative solution uses an ON/OFF switch for the machine. Basically,
the main switch remains switched on and provides the power supply for the PC during shutdown. Via the
PC ON-input of the power supply the PC gets the command to shut down the operating system.
Once the PC has shut down, the PC power supply unit sets the Power Status-output (P-S) to 0, what
indicates that the process is complete and that the main voltage can be switched off. This can be done
manually via a signal lamp connection or via a contactor. With this solution the main switch generally only
has to be switched off if the control cabinet has to be opened. The battery will only be used in the event of
C6920/ C6925 15
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