Installation
3.3.3 Connecting Power Supply
The external wiring consists of the connection of the power supply, the battery pack (optional) and the
connection of customized components for shutting down the PC.
3.3.3.1 Cable Cross Sections
For the connection of the power supply, wiring with a cable-cross-section of 1.5 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 16 A.
3.3.3.2 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.
3.3.3.3 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-energizing the whole system. The
maximum load for the Power Status output is 0.5 A and a suitable fuse should be provided.
3.3.3.4 UPS output
In order to maintain a screen display for the PC in the event of a power failure, the power supply unit is
equipped with a UPS output for connecting a Control Panel. The maximum load for the output is 1.4 A
(max. 2.5 A from 2016 and later).
3.3.3.5 UPS output function
• The 24 V DC connection at the UPS output is live even after a power failure. The maximum load
is 1.4 A (max. 2.5 A from 2016 and later).
• Once the PC has been de-energized via the UPS software, the UPS output is switched to 0 V.
Any connected panel is thus switched off, and total discharge of the rechargeable battery is
prevented.
18 C6920/ C6925
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