Fig. 10 Mounting Strain Relief - Beckhoff CU8803-000 Series Manual

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 mm
long supply lines, use 1.5 mm
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 V
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.
ð 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).
A
Fig. 10: Mounting strain relief
ð 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.
ð You have attached the USB connector to the strain relief.
CU8803-000x
2
cables to achieve a low voltage drop on the supply line. At least 22 V should
power supply unit:
DC
B
Version: 2.0
2
can be used for connecting the power supply. For
C
Commissioning
17