Connecting the 24 V power supply

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.

As an alternative to the 100-240 V AC power supply in the basic configuration, you can order the industrial PC with a 24 V DC power supply. The options C9900-P208 without integrated UPS and C9900-P209 with integrated UPS are available.

Connect power supply via 24 V DC 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:

1. Install the power supply cable (see the following section "Mounting the supply line").
2. Plug the power supply cable into the power supply socket on the device.
3. Connect the device to your external 24 V power supply.
4. Switch on the 24 V power supply.
You have connected the device to the power supply.

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. Only use the Beckhoff C9900-U330 battery pack (http://www.beckhoff.com/c9900-u330).

You can use the UPS output of the power supply and connect a Beckhoff Control Panel. If the supply voltage fails and the device is only supplied by the battery pack, the control panel remains in operation. 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 the 24 V power supply 1:Fig.27: 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.

Before you can connect the power supply, you must install the power supply line yourself. For this purpose, use the supplied material for connector assembly. It consists of an 8-pin connection strip and a strain relief housing with cable tie.

Mounting the supply line

First mount the plug on the cable as follows:

1. Remove the insulation from the cable ends (8-9 mm).
2. Screw the cable ends into the connection strip. For the pin assignment of the connector, see Chapter Power supply.
You have fitted the supply line to the plug.
Connecting the 24 V power supply 2:Fig.28: Mounting the supply line

Assembly of strain relief housing

Now fit the strain relief housing to the already connected plug and supply line:

1. Thread the cable tie into the lower part of the strain relief housing (section A).
2. Insert the connection strip into the lower part of the strain relief housing (section B).
Connecting the 24 V power supply 3:Fig.29: Insert lower part strain relief
3. Tighten the cable tie and remove the plastic tab (section C).
4. Attach the upper part of the strain relief housing by snapping it onto the lower part (section D).
Connecting the 24 V power supply 4:Fig.30: Fasten strain relief
You have mounted the strain relief housing.

To dismantle the strain relief housing, proceed as follows:

1. Use your fingers to bend the latching lugs on the lower part slightly outwards.
Connecting the 24 V power supply 5:Fig.31: Disassembly of the strain relief housing
2. Lever the upper part off the lower part.
3. Cut the cable tie.
You have dismantled the strain relief housing.