Beckhoff C6920 User Manual download pdf (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 customized 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 1.5 mm

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.

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-energizing the whole system. The maximum load for

the Power Status output is 0.5 A and a suitable fuse should be

provided.

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.

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.

• 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.

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Beckhoff C6920 User Manual Page 18

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