Connect transmitter box
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Risk of electric shock Dangerous touch voltages can lead to electric shock. To avoid electric shock, observe the following:
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Incorrect connection procedure Incorrect procedure when connecting the cable can cause hardware damage.
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To make the transmitter box ready for operation, you have to connect it. The first step is to ground the device. Then you can connect the cables and the power supply.
An external power supply unit is required to supply 24 V DC (-15 %/+20 %) for operating the device.
The cabling of the transmitter box in the control cabinet must be done in accordance with the standard EN 60204-1:2006 PELV = Protective Extra Low Voltage:
- The PE conductor (protective earth) and the "0 V" conductor of the voltage source must be on the same potential (connected in the control cabinet).
- Standard EN 60204-1:2006, section 6.4.1:b stipulates that one side of the circuit, or a point of the energy source for this circuit must be connected to the protective conductor system.
Devices connected to the transmitter box with their own power supply must have the same potential for the PE "0 V" conductors as the control panel (no potential difference).
Grounding
Potential differences are minimized and electrical currents are diverted to the ground through protective earthing or potential equalization of electronic devices. This is to prevent dangerous touch voltages and electromagnetic interference.
The voltage socket of the transmitter box contains a PIN for protective earthing. Establish the low-resistance protective earthing by connecting the power supply.
Connect transmitter box
Make sure that you plug all data transmission cables into the transmitter box first and then connect 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. At least 22 V should be present at the power supply plug of the transmitter box so that the transmitter box remains switched on in the event of voltage fluctuations.
Proceed as follows to connect the 24 VDC power supply unit:
- 1. Plug the voltage connector into the voltage socket on the transmitter box.
- 2. Screw the voltage connector to the voltage socket.
- 3. Connect the transmitter box to your external 24 V power supply.
- 4. Switch on the 24 V power supply.
- 5. Measure the voltage at the 3-pin connection strip of the transmitter box.
- You have connected the transmitter box.
Mounting strain relief
To meet the criteria of ATEX certification II 3G Ex ec IIC T4 Gc and II 3D Ex tc IIIC T135 °C Dc for use in hazardous areas, you need a strain relief for the USB connector. Use the Beckhoff ordering option C9900-Z484 for this.
The strain relief is labeled on one side. You can see from the labeling which of the two brackets is to be used for the CU8803 transmitter box. The corresponding bracket is additionally marked in Figure 10.
To mount the strain relief on the DIN rail next to the transmitter box, follow the steps below, shown in Figure 10:
- 1. Hook the strain relief bracket into the DIN rail with the lower hook immediately to the right of the transmitter box (section A). Make sure that the labeled side faces to the right.
- 2. Tilt the strain relief into a straight position to hook the other side of the bracket into the DIN rail (section B).
- 3. Tighten the two Torx TX20 screws on the strain relief bracket (section C).
- You have mounted the strain relief on the DIN rail.
- 4. Secure the USB connector to the bracket with cable ties.
- 5. Check the tensile strength of the cable. If necessary, retighten the cable ties.
- 6. Cut off the rest of the cable ties with pliers or side cutters.
- You have attached the USB connector to the strain relief.