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

The connection of incorrect battery packs can lead to damage to the Industrial PC and to the battery packs.

  • Connect only Beckhoff battery packs to your Industrial PC.

Connecting cables

The connections are located in the front of the industrial PC and are documented in Chapter 3.1 Structure.

Make sure that you first ground the PC (see chapter Grounding of the Industrial PC) and then plug in all data transmission cables.

Connecting the power supply

Cables with a maximum cable cross-section of 1.5 mm2 must be used for connecting the power supply. To achieve the lowest possible voltage drop on the supply line, we recommend connecting the maximum possible cross-section. In case of larger distances between the power source and the PC, take into account the voltage drop in relation to the cable cross-section as well as fluctuations in your supply voltage in order to ensure that the voltage at the power supply unit does not fall below 22 V.

Proceed as follows to connect the 24 VDC power supply unit:

  1. Check the correct voltage of your external power supply.
  2. Install the power cable.
  3. Plug the power cable into the voltage socket of the industrial PC.
  4. Screw the power cable to the voltage socket of the industrial PC.
  5. Connect the PC to your external 24 V power supply.
  6. Switch on the 24 V power supply.

External battery pack and UPS output

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 Beckhoff battery packs for this:

When using the C9900-U330 battery pack, you can use the UPS output of the power supply unit (UPS Output). The method of connecting different components can be taken from the wiring diagram in Fig. 19.

Connecting cables and power supply 1:
Wiring diagram

So that the industrial PC still has a monitor output in case of a power failure, a control panel can be connected to the UPS output of the power supply unit. 24 VDC is present between the UPS output and the negative pole of the battery pack even after a power failure. The maximum load is 1.4 A (max. 2.5 A from year of manufacture 2016).

Once the PC has been de-energized via the UPS software, the UPS output is switched to 0 V. A connected panel is switched off.