KUKA KR CYBERTECH-3 HW maintenance troubleshooting

The maintenance table on the same platform shows that when replacing A5 gear oil at 20000 hours or 5 years, the first filling amount is about 0.15 L; when replacing A4 gear oil, the first filling amount is about 0.20 L; when replacing A3, it is about 0.40 L; when replacing A2, it is about 1.10 L; when replacing A1, it is about 1.70 L. The recommended oil type is Optigear Synt. ALR 150. Oil discharge must be carried out at operating temperature and the discharge volume measured. If the discharge volume is less than 70% of the specified amount, it should be rinsed once; If it is less than 50%, rinse twice. The filling amount shall be based on the actual discharge amount. Be aware that the oil chamber may be under pressure, and release the pressure before opening the drain plug. The torque of M18x1.5 magnetic plug is usually about 20 Nm, while M10x1 is about 7.5 Nm. After changing the oil, check for leaks and observe abnormalities during T1 operation.

The HW version also has a gearbox and lubrication points inside the wrist, but the hollow wrist structure is compact, with less space for oil discharge and filling. Be careful not to contaminate the internal wire feeding tube and air tube with oil during operation, otherwise it will affect the welding quality. If oil is found to have entered the wrist, it must be cleaned and the seal checked.

Common fault three: Insufficient lubrication of cable assembly

Maintenance table requirements: Lubricate cable group A4 with Optitemp RB2 for 10000 hours, using approximately 0.06 kg; lubricate cable group A1 with Optitemp RB2 for 10000 hours, using approximately 0.08 kg. Symptoms: base or arm cable wear, abnormal noise, dust accumulation. Solution: Clean the hose and contact surface, apply the approved lubricating grease thinly and evenly, wipe off excess grease after reinstallation, and move the relevant shaft to evenly distribute the grease. Lubricating grease should not be excessive to avoid adsorbing dust. If the hose is damaged, the cable assembly must be replaced. The HW version also needs to check the lubrication status of the cables and wire feeding tubes inside the wrist, as the internal pipelines bend with the movement of the wrist, and insufficient lubrication can accelerate wear.

Common fault four: Wear of internal pipelines in the hollow wrist

This is the most typical malfunction of the HW version. Performance: Unstable wire feeding, misalignment of welds, air leakage in the trachea, internal abnormal noise, and increased resistance to wrist movement. Reason: The wire feeding tube, trachea, and cable have been repeatedly bent inside the wrist for a long time, causing friction with the inner wall; Welding spatter and dust ingress; Improper pipeline layout; Insufficient lubrication. Solution: Open the wrist maintenance cover and check if the internal pipelines are worn, flattened, broken, or stuck. The wire feeding tube must be replaced due to wear and tear; The trachea must be replaced if there is a leak; The cable sheath must be repaired or replaced if it is damaged. When rearranging pipelines, ensure that there is no straightening, squeezing, or rubbing of the inner wall within the range of motion. If necessary, use specialized guides and lubricating grease. When cleaning, do not use high-pressure water or compressed air to directly blow the internal bearings and sealing points to avoid damage.

Common fault five: Mastering loss and zero calibration

Performance: teaching point offset, program unable to reproduce, abnormal axis angle display. Reason: Replacement of motor, manual release of brake, loss of encoder data, collision, change in wrist posture after replacing internal pipelines. The Mastering positions for this series are: A1 0 °, A2-90 °, A3 90 °, A4 0 °, A5 0 °, A6 0 °. Priority should be given to using EMD or a dial gauge for standard Mastering. After replacing the motor, gearbox, toothed belt, connecting shaft, internal pipeline or manually moving the brake, it is necessary to re master. If the release device is used to move the motor, the shaft will lose its zero point and must be re Mastered. The accuracy of emergency Mastering is relatively low, and standard methods should be used to recalibrate as soon as possible afterwards.

Common Fault 6: Connecting Cable and Grounding

Performance: The controller reports motor/data line faults, intermittent shutdowns, and abnormal shielding. Solution: Check motor cables XD20.1... XD20.6/XD10.1/XD10.2 to XD30, and data cables XF21 to XF31. The grounding conductor has a cross-sectional area of 16 mm ², an M8 ring terminal, and an M8 nut torque of approximately 15.0 Nm. The cable length can be selected from 2.7 m, 4 m, 7 m, 10 m, 15 m, 20 m, 25 m, 35 m, and 50 m, with a maximum of 50 m and a maximum extension of once. The minimum bending radius for motor cables is approximately 150 mm dynamically, and for data cables it is approximately 60 mm. The cables should not withstand tensile forces and should be laid separately from the power lines. The connector must be locked during installation. When the motor connector is locked, there is a "click" sound and the red locking ring is not visible. If using an external axis, it is necessary to confirm the cascode RDC option and corresponding interface XP7.1/XP8.1. The HW version also needs to check the grounding and shielding of the internal cables on the wrist to ensure that welding high-frequency interference does not affect the signal.