BECKHOFF CP72xx - Manual (Page 18)

Installation Instructions
Connecting Power Supply
The external wiring consists of the connection of the power supply, the
battery pack (optional) and the connection of customised components for
shutting down the PC.
Cable Cross Sections
Note cable cross sections,
avoid voltage drop! For the connection of the power supply, wiring with a cable-cross-section
of 1.0 mm
2 must be used.
With bigger distances between voltage source and PC, you take the
voltage drop as a function of the cable-cross-section as well as voltage
fluctuations of your distribution voltage into account, so that is secured that
the voltage doesn't fall under 22 V at the power supply.
Insert fuse
Attention
The power supply must be protected with maximum 10 A.
Configuration for shutting down the PC
The connections for shutting down the Industrial PCs are established via
the PC_ON input and the Power Status output.
PC_ON and Power Status functions
• If the PC_ON input is connected to 24 V via a switch, the PC shuts
down according to the rules. The PC_ON signal is inverted, i.e. the
PC shuts down if the 24 V connection is live.
• If the PC_ON input is NOT connected by the user, the PC can be
booted in the familiar way by connecting the supply voltage and shut
down via the battery by switching off the supply voltage.
Service life of the rechargeable battery
Attention
This procedure significantly reduces the service life of the rechargeable
battery and should therefore not be used.
• Once the PC has shut down, the Power Status output is switched
from 24 V to 0 V. Via this output a signal lamp can be connected or a
contactor for de-energising the whole system. The maximum load for
the Power Status output is 0.5 A and a suitable fuse should be
provided.
16 CP72xx