Troubleshooting and Maintenance of KUKA KR C4 Control Cabinet

Key module replacement process

Before replacing any module, five safety rules must be followed: power off, prevent accidental restart, confirm that the system is out of power, ground short circuit, and cover or isolate adjacent live parts. Wait for at least 5 minutes after power failure to allow the intermediate circuit to discharge. KPP、KSP、 The motor connection and intermediate circuit cables may still carry a voltage of 50 V to 780 V. Wear protective gloves and comply with ESD regulations during operation.

When replacing the external fan, first unplug the fan connector X14, remove the rear panel, remove the fan bracket and fan, install a new fan and restore the connection. When replacing the internal fan, unplug the fan connector X962, remove the fastening screws of the fan module, install the new module and connect it. When replacing the control PC, unplug the power supply and all connections, loosen the rolling nut, and take out the PC along the guide rail; After installing a new PC, connect the network cable, start the controller, and test it. When replacing the control PC fan, it is necessary to open the PC casing, remove the fan grille, fan, and rivets, install a new fan, and restore it. When replacing HDD/SSD, disconnect the SATA and power connections, remove the knurled screws, install the new hard drive, install the operating system and KSS, and configure the system through WorkVisual. When replacing the LAN Dual NIC network card, open the PC case, unplug the connection, release the network card fixing, insert the new network card and fix it.

When replacing KPP, unplug all connections, unlock and unplug X20 and X21 data cables, loosen Allen screws, and remove KPP from the bracket; When installing the new KPP, hang it into the bracket and tighten the fastening screws with a torque of 4 Nm, then insert it back into the connection according to the label and lock X20 and X21. Replacing KSP is similar. When replacing the CCU, unlock the data cable connector, unplug all connections, remove the fixing plate, and take out the CCU; After installing the new CCU, insert it back according to the label and lock the connector. When replacing the SIB, unlock the data cable connector, unplug all connections, remove the fixing plate, install the new SIB, and insert it back according to the label. When replacing the RDC, disconnect all cables, remove the RDC box cover, unplug the EDS connection, remove the 4 TORX screws, and take out the RDC module; When installing a new RDC, thread the cable through the designated entrance and place it in the RDC box. Tighten the TORX screws in diagonal order to 2.0 Nm, connect the EDS, X15, X17, X18, X20, and rotary transformer cables X1 to X6, cover the box cover and tighten to 3.0 Nm. When replacing the battery, pay attention to the polarity, both battery blocks must be replaced at the same time, and check if the system variable $ACCU_STATE is # CHARGE.OK. When replacing the low-voltage power supply, unplug the connection, remove the rear panel, take out the power supply, install a new power supply, and restore the connection. When replacing the pressure relief plug, remove the foam ring, replace the filter element, and replace the foam ring. When replacing the brake resistor, measure the resistance value. X7.1 to X7.3 and X7.2 to X7.4 should be 11 Ω± 10% for 2 22 Ω brake resistors, and the same for 4 44 Ω brake resistors. When replacing the main filter, remove the main switch and side panel, disconnect them, remove the grounding conductor, install a new filter, and restore it.

Battery, heat dissipation and cleaning

The battery maintains power supply to the control components in the event of a power failure until the controller is controlled to shut down. Charge the battery every 9 months when the storage temperature is not higher than+20 ° C, every 6 months when the temperature is between+20 ° C and+30 ° C, and every 3 months when the temperature is between+30 ° C and+40 ° C. The cross garbage bin symbol on the battery indicates that it cannot be treated as ordinary household waste, while the Pb, Cd, and Hg symbols indicate that the lead, cadmium, and mercury content exceeds the standard and must be recycled. The control cabinet adopts two cooling circuits: the internal area contains control and power electronics, which are cooled by a heat exchanger; The braking resistor and KPP, KSP radiators in the external area are directly cooled by ambient air. Do not install filter cotton in front of the ventilation duct, otherwise it will cause temperature rise and shorten equipment life. When cleaning the control cabinet, the power must be turned off and wait for 5 minutes. Use solvent-free, water-soluble, non flammable, and non corrosive cleaning agents. Do not use compressed air, spray water, or allow cleaning agents to enter electrical components. Replace damaged or unreadable labels and nameplates after cleaning.

Debugging and System Configuration

Before debugging, check whether the control cabinet is complete, whether there is any transportation damage, and confirm that the fuses, contactors, and boards are securely installed. Connect the 16mm ² PE equipotential cable to the robotic arm and robot controller, and connect the central PE row of the power supply cabinet. When connecting motor cables and data cables, pay attention to the bending radius: for fixed installations, it should be 3 to 5 times the cable diameter, and for cable drag chains, it should be 7 to 10 times. When connecting X1 power supply, pay attention to the rated voltage and phase sequence. Insert smartPAD into X19, restore battery discharge protection connector X305, configure X11 or X66 safety interface, and start the controller. System configuration must be modified using WorkVisual in the following situations: installing KSS/VSS 8.2 or higher, replacing hard drives, changing devices of different models, removing or adding devices. When replacing equipment, devices of the same type can be replaced, but two identical components in KCB cannot be replaced simultaneously. The startup mode is used to move the robotic arm in T1 mode when the external safety device has not been installed or put into operation. At this time, all outputs are automatically set to logic zero, the external safety device is disabled, and no one is allowed in the danger zone. The operating modes include T1, T2, AUT, and AUT EXT. In T1 mode, the axis speed monitoring defaults to a rotation axis of 30 °/s, a linear axis of 250 mm/s, and a Cartesian speed of 250 mm/s. New or modified programs must be tested in T1 mode first.