BECKHOFF CU8803 Launch Box Installation and Explosion proof Guide

Connector ordering number (spare part): C9900-P944 (3-pin spring terminal).

Grounding point: The PE pin of the power plug is used to establish a low impedance protective grounding. Be sure to ensure that the PE of the 24V power supply is at the same potential as 0V (PELV system), otherwise it may cause touch drift or communication abnormalities.

DIN rail installation and stress relief assembly

4.1 Installation of Launch Box

CU8803 measures 70 × 100 × 80mm (width × height × depth), weighs 745g, and is installed on a 35mm DIN rail (compliant with EN 50022):

Tilt the launch box from above and hang it onto the guide rail (hook first).

Push the bottom towards the guide rail until the lower hook locks and engages.

4.2 Installation of USB Stress Relief Bracket (C9900-Z484)

The necessary steps for explosion-proof compliance:

Hang the lower hook of the bracket onto the DIN rail on the right side of the launch box.

Align the bracket so that the upper hook clicks into the guide rail.

Tighten the two Torx TX20 screws.

Insert the USB connector into the X10 port of the transmitter box and secure the USB cable to the bracket with a zip tie.

Check the tension, tighten the zip ties if necessary, and cut off excess zip ties.

Attention: If the stress relief bracket is not installed, the USB connector may loosen in a vibrating environment, causing communication interruption and being judged as non compliant in the explosion-proof review.

Debugging and configuration process

5.1 Connection sequence (strictly follow)

Connect the USB cable to the PC and transmitter box X10.

Connect the DVI/DP cable to the PC and transmitter box X20.

Connect the Cat.6A Ethernet cable to the transmitter X30 and control panel CP Link 4 input.

Finally, connect the 24V power supply (connect the wires first and then power on).

Attention: Be sure to complete all signal line connections before turning on the power. Live plugging and unplugging may cause interface damage.

5.2 Power on inspection

The power LED (P10) of the launch box is on green → 24V power supply is normal.

CP Link output P30 lights up green → successfully connected to the panel.

P20 flashing → DVI signal is being transmitted.

The panel screen lights up → the system is working properly.

5.3 Quick Guide to Fault Diagnosis

Possible cause investigation steps for the phenomenon

P10 LED not lit. Power supply not connected or voltage too low. Measure X40 voltage (20.4~30V), check polarity, and check external fuse

P30 does not light up (no connection), Cat.6A cable is broken or the length exceeds the limit, replace the cable; Confirm length ≤ 100m; check panel CP Link 4 input

P20 does not flash, but P30 lights up. The DVI signal has not arrived. Check if the DVI/DP output on the PC is normal; Confirm that the cable length is ≤ 1m

The panel image is blurred or flickering, and the Cat.6A cable quality is poor or interfered with. Use shielded Cat.6A cables; Stay away from high interference sources such as frequency converters

USB devices cannot recognize USB cables that are too long or of poor quality. Confirm that the USB cable from the PC to the transmission box is ≤ 1m. Check if the USB driver is installed

Panel no touch response USB communication interruption check USB cable connection; Check if the stress relief bracket is secure

Comparison with CU8802 and usage warning

Features CU8802 CU8803

Number of cables 2 (signal+power separation) 1 (Cat.6A, signal+power integration)

The panel power supply requires an additional connection of 24V through CP Link cable for power supply

Maximum distance 100m 100m

ATEX/IECEx No Yes

Serious warning: If CU8803 is confused with the previous configuration using CU8802 and an additional 24V power supply is connected to the panel end, it will cause a dual voltage conflict and directly burn the panel or transmitter box. When using CU8803, the 24V power socket on the panel must remain empty (without wiring).

Maintenance and Cleaning

Cleaning method: Only use a vacuum cleaner to clean the casing (IP20 protection level). It is strictly prohibited to use compressed air, otherwise dust may blow into the interior of the equipment and cause a short circuit.

Prohibited cleaning agents: Do not use cleaning agents, metal scrapers, or razor blades containing abrasive ingredients.

No need for regular maintenance: There are no user replaceable parts inside the device.

Quick Overview of Technical Parameters

Parameter specifications

Dimensions (W × H × D) 70 × 100 × 80 mm

Weight 745 g

The power supply voltage is 20.4~30V DC (24V nominal, NEC Class 2）

Maximum current 4.7 A

Working temperature 0~55 ° C

Storage/transportation temperature -25~70 ° C

Protection level IP20

Explosion proof certification ATEX II 3G Ex ec IIC T4 Gc/IECEx

Maximum transmission distance of 100 meters (Cat.6A)

PC side cable length USB/DVI/DP ≤ 1 m

Common Troubleshooting Ladder Table

Prioritize troubleshooting and advanced measures for fault symptoms

The launch box has no response at all. Check the 24V power supply and fuse; Confirm the correct polarity of the power terminal and measure whether the X40 voltage is ≥ 20.4V; check the PE grounding

The panel has no display but the power light is on. Check if the Cat.6A cable is securely plugged in; Confirm the status of the P30 light and replace the Cat.6A cable; Check if the output resolution of the PC graphics card exceeds the supported range of the panel