Connecting cables and power supply

Notice

Incorrect connection procedure

Incorrect procedure when connecting the cables and the power supply can cause hardware damage.

  • Follow the documented procedure for connecting the cables and the power supply.
  • Always connect the cables first and only then switch on the power supply.
  • Please read the documentation for the external devices prior to connecting them.

Notice

Connection of incorrect battery packs

Connecting the wrong battery packs can cause damage to the device and the battery packs.

  • Only connect the C9900-U330 Beckhoff battery pack.

The connections are located on the inside of the device.

Connecting cables

Make sure that you ground the device first (see chapter 4.3.2 Grounding of the industrial PC).

Connecting the power supply

Cables with a maximum cable cross-section of 1.5 mm2 can be used for connecting the power supply. For long supply lines, use 1.5 mm2 cables to achieve a low voltage drop on the supply line. There should be at least 22 V at the voltage connector of the device, so that the device remains switched on during voltage fluctuations.

Proceed as follows to connect the 24 V DC power supply unit:

1. Plug the voltage connector into the voltage socket on the device.
2. Screw the voltage connector to the voltage socket.
3. Connect the device to your external 24 V power supply.
4. Switch on the 24 V power supply.
You have connected the power supply.

External battery pack

If you ordered your device with an integrated UPS, then you can connect an external battery pack and install it on a DIN rail near to the PC. Use only the Beckhoff C9900-U330 battery pack:

Order identifier battery pack

Order identifier

Link to option

C9900-U330

https://www.beckhoff.com/c65xx

Select a product variant and then select the “Options” tab at the bottom of the website.

You can use the UPS output of the power supply unit and connect a Beckhoff control panel as a second display. If the supply voltage fails and the device is only supplied by the battery pack, the control panel remains in operation. Second display operators can use it to read the power failure notification, back up data, and shut down the operating system.

PIN 4 and 5 of the battery pack are available for looping through a 24 V power supply. Accordingly, you can connect a three-core sheathed cable with plus and minus of the supply voltage as well as protective earth to the battery pack and then connect to the PC with a five-core sheathed cable. The method of connecting different components can be taken from the wiring diagram.

Connecting cables and power supply 1:Fig.32: Wiring diagram C9900-U330

Further information on the battery pack can be found in the corresponding manual in the download finder on the Beckhoff website C9900-U330.