Connection 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.

Connecting cables

Make sure that you first ground the panel (see chapter 4.3.1 Grounding the control panel) and then plug in all data transmission cables.

Lay the cables in the mounting arm adapter as shown in chapter 4.3.2 Routing the cables in the mounting arm adapter and then plug in all data transmission cables.

Check the screw connections between the plugs and sockets.

When connecting the control panel to an industrial PC with UPS output, we recommend using this for the connection. In the case of CP-Link 4, we recommend connecting the CU880x transmitter boxes to the UPS output of the PC.

Connecting the power supply

Cables with a maximum cable cross-section of 4 x 0.75 mm² can be used for connecting the power supply. For long supply lines, use 4 x 0.75 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 control panel, so that the panel remains switched on during voltage fluctuations.

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

Check the correct voltage of your external power supply.
Plug the voltage connector into the voltage socket on the panel.
Screw the voltage connector to the voltage socket. Then check the screw connection.
Connect the panel to your external 24 V power supply.
Switch on the 24 V power supply.
Calculate the voltage at the power supply plug.

In order to check the voltage at the power supply plug, you must first calculate the voltage drop on the supply cable. You can orient yourself to the following calculation example:

CP3924-0000
Power consumption: 34 W
Current consumption: 34 W / 22 V = 1.5 A
Connection with 10 m two-core 0.75 mm² cable, where the supply cable length then corresponds to 20 m
Constant of specific resistance of pure copper: 0.0178 Ohm * mm²/ m
Resistance of the supply line: 0.0178 ohm*mm²/m * 20 m / 0.75 mm² = 0.0178 * 20 / 0.75 = 0.475 ohm

With the listed data, you can now calculate the voltage drop on the supply line:

1.5 A * 0.475 Ohm = 0.7 V

With a CP39xx-0010 with CP-Link 4 and CU8802 transmitter box or PCIe module, the power consumption increases. In this case, orient yourself to the following example:

CP3924-0010
Power consumption: 40 W
Current consumption: 40 W / 22 V = 1.8 A
Voltage drop: 1.8 A * 0.475 Ohm = 0.85 V

With a CP39xx-0010 with CP-Link 4 and CU8803 transmitter box, you only have to pay attention to the voltage on the supply line to the transmitter box. For more detailed information, please refer to the manual for the CU8803.

All information on the power consumption can be found in chapter 8 Technical data.