KUKA KR QUANTEC-2 Maintenance Troubleshooting Guide

KUKA KR QUANTEC-2 Maintenance Troubleshooting Guide

The KUKA KR QUANTEC-2 series is a six axis articulated robot designed for medium to high load handling, palletizing, processing, and assembly scenarios, covering KR 120 R2700-2、KR 120 R3100-2、KR 150 R2700-2、KR 150 R3100-2、KR 180 R2900-2、KR 210 R2700-2、KR 210 R3100-2、KR 240 R2900-2、KR 250 R2700-2、KR 300 R2700-2  Equivalent models and derived variants such as C01, F, and C. Among them, C01 corresponds to a specific drive chain configuration, F is the casting environment enhanced protection version, and C is the top mounted version. For on-site engineers, mastering the transportation posture, installation specifications, oil change cycle, balance cylinder pressure inspection, motor replacement, and troubleshooting are key to ensuring the stable operation of the production line.

Model Identification and Basic Data Quick Search

The KR QUANTEC-2 adopts a six axis articulated arm motion system, which can control six axes. The differences between different models mainly lie in rated load, maximum arm span, and cycle time. KR 120 R2700-2 has a rated load of 120 kg, a maximum load of 167 kg, a maximum arm span of 2701 mm, a body weight of approximately 1069 kg, a pose repeatability accuracy of ± 0.05 mm, a protection level of IP65, and an optional wrist protection level of IP67. The controller supports KR C4, KR C5 M6/M7, and KR C5-2 M6/M7. KR 120 R3100-2 has a maximum arm span of 3100 mm and a maximum load of 210 kg, weighing approximately 1105 kg. KR 150 R2700-2 has a rated load of 150 kg, a maximum load of 218 kg, and a weight of approximately 1072 kg. KR 150 R3100-2 has a maximum load of 220 kg, weighing approximately 1105 kg. KR 180 R2900-2 has a rated load of 180 kg, a maximum load of 253 kg, and a weight of approximately 1105 kg. KR 210 R2700-2 has a rated load of 210 kg, a maximum load of 275 kg, and a weight of approximately 1077 kg. KR 210 R3100-2 has a maximum load of 281 kg, weighing approximately 1134 kg. KR 240 R2900-2 has a rated load of 240 kg, a maximum load of 319 kg, and a weight of approximately 1120 kg. KR 250 R2700-2 has a rated load of 250 kg, a maximum load of 315 kg, The weight is approximately 1101 kg. The KR 300 R2700-2 has a rated load of 300 kg, a maximum load of 370 kg, and a weight of approximately 1101 kg.

In terms of axis data, A1 has a motion range of ± 185 °, A2 is -140 °/-5 °, A3 is -120 °/168 °, A4 ± 350 °, A5 is mostly ± 122.5 ° or ± 125 °, A6 ± 350 °. The rated load speed of different models varies slightly, for example, A1 of KR 120 R2700-2 is about 120 °/s, A2 is about 115 °/s, A3 is about 120 °/s; A1 of KR 300 R2700-2 is about 105 °/s, A2 is about 101 °/s, A3 is about 107 °/s. The zero calibration position is usually A1-25 °, A2-100 °, A3 100 °, A4 0 °, A5 0 °, A6 0 °. The load center of gravity and inertia must be input into the controller, otherwise trajectory planning and dynamic performance will deviate from expectations.

In terms of environmental conditions, the standard operating temperature is 0 ° C to 55 ° C, and the storage and transportation temperature is -40 ° C to 60 ° C. Low temperature operation may require preheating and avoid condensation and frost. ESD requirements comply with IEC 61340-5-1 and ANSI/ESD S20.20. The noise level is below 75 dB (A). The installation location can be on the ground or ceiling, depending on the model. The foundation load, flange load, and supplementary load must be calculated according to the model, load center of gravity, and inertia.

Safety logic and homework prerequisites

KR QUANTEC-2 belongs to incomplete machinery and must be integrated into a complete system and meet the EU Machinery Directive before it can be put into operation. The system integrator is responsible for risk assessment, implementation of safety functions, CE labeling, and complete system operation manuals. The danger zone consists of a workspace and a stopping distance, where the stopping distance is equal to the reaction distance plus the braking distance. The safety protection device must be located outside the danger zone, but the robot stopping process may still be completed within the danger zone.

The manual operation mode is divided into T1 and T2. T1 is the manual slow debugging mode, with a speed not exceeding 250 mm/s, suitable for jogging, teaching, programming, and program verification. T2 is a manual quick debugging mode that allows for speeds exceeding 250 mm/s, but is only used for testing that requires speeds higher than T1. Teaching and programming are not allowed under T2. When multiple people enter a safe area, each person must be equipped with an enabling device, and everyone must be able to see the robot unobstructed and maintain mutual visibility. Automatic mode requires all safety protection devices to function properly, with no one in the hazardous area, or to meet the EN ISO 10218 cooperation requirements.

When maintaining and repairing, priority should be given to working outside of hazardous areas. When it is necessary to enter a dangerous area, the robot should be turned off and locked with a tag, and if necessary, it should be done under T1. The emergency stop device must remain effective. If the security function is temporarily disabled, it must be restored immediately after the work is completed. After the robot controller is turned off, some components may still carry a voltage of 50V to 780V for several minutes, and must wait for discharge and comply with ESD regulations. For controllers with transformers, the transformer should be disconnected before operation. The balance cylinder belongs to pressure equipment, and the pressure status must be confirmed before operation and operated by professional personnel.

Key points of transportation and installation

The robot must be placed in the transport position before transportation. The transport poses of KR QUANTEC-2 are A1 0 °, A2-137 °, A3 160 °, A4 0 °, A5-105 °, A6 0 °. Vibration and impact should be avoided during transport until the robot is securely fixed. When transporting by forklift, four fork slots are installed on the base, and the forklift can start from the front and rear sides. The minimum load capacity of the forks is about 2.0 tons. When using transportation lifting equipment, connect the two front fork slots and the rotating column, and arrange all lifting equipment according to the diagram to prevent the robot from overturning or being damaged. It is prohibited to use cranes to lift robots in other ways.

Ground installation usually uses the S780 mounting base with centering. The base consists of a base plate, chemical anchor bolts, and fasteners, and requires a flat concrete foundation with sufficient bearing capacity. The recommended concrete grade is above C20/25. If there is an insulation layer or leveling layer between the bottom plate and the concrete, it must be in full contact and have sufficient compressive strength. The basic dimensions, margins, and concrete thickness need to be confirmed according to the drawing. Chemical anchor bolt construction must use the same manufacturer's resin and anchor bolt, and diamond drill bits or core drills should not be used. The drilling tools provided by the anchor bolt manufacturer should be prioritized. During installation, first fix the base plate and positioning pin, then place the robot on the foundation, drill 12 anchor bolt holes, install chemical anchor bolts, and connect the cables after curing. Tighten 8 M24x65-8.8 hex bolts step by step to the specified torque. The optional 150mm mounting base S780 uses 16 chemical anchor bolts.

Rack installation is used for steel structures, mounting brackets or KUKA linear guides, and can also be used for top mounting. The installation surface needs to be prepared according to the diagram, using two locating pins and eight M24x65-8.8 hexagonal bolts, and tightened step by step to the specified torque. During top installation, it is also necessary to ensure that the bottom structure can withstand the foundation load.

Connecting cables and interfaces

The connecting cables include motor cables, data cables, and grounding wires. KR C4 uses Han 16HP motor cable from X20 to X30, Han 3A Q12 data cable from X21 to X31, with a grounding wire of 16 mm ². KR C5 and KR C5-2 use 6 motor plugs XD20.1 to XD20.6, 2 brake plugs XD10.1 and XD10.2 to XD30, and data cables XF21 to XF31. The cable length can be selected from 7 m, 10 m, 15 m, 20 m, 25 m, 30 m, 35 m, 50 m, with a maximum of 50 m and a maximum of one extension allowed. When fixed laying, the bending radius of motor cables should not be less than 150 mm, and that of data cables should not be less than 60 mm. The cables should be installed in metal cable trays, and the motor and data cables should be laid separately to avoid stretching, sharp edges, and tripping risks.

The grounding wire must be connected using a circular cable terminal, with an M8 nut torque of 23.0 Nm. The equipotential connection should be checked according to VDE 0100 and EN 60204-1. Interface A1 is located at the rear of the base and includes motor cable X30, data cable X31, grounding conductor, optional external shaft interfaces XP7.1 and XP8.1. If the robot is equipped with a pipeline package, there may be additional air and cable interfaces between A1 to A3 and A3 to A6.

Oil change and maintenance cycle

The maintenance cycle is related to the working conditions. Under normal circumstances, check the tightening torque after 100 hours of operation; Lubricate the balance cylinder bearings every 5000 hours or at the latest 1 year, using approximately 10 cm ³ of LGEP 2 grease; Check the balance cylinder pressure every 5000 hours using Hyspin ZZ 46 hydraulic oil; Replace gear oil every 20000 hours or no later than 5 years; Replace the balance cylinder every 10 years. The maintenance cycle of the F variant is shorter, with lubrication and pressure checks every 2500 hours or 1 year, and oil changes every 10000 hours or 5 years.

In terms of oil change volume, A1 has an oil change volume of about 5.70 L, A2 has an oil change volume of about 2.10 L, A3 has an oil change volume of about 1.40 L, A4 has an oil change volume of about 2.10 L, and A5/A6 has an oil change volume of about 1.40 L. The standard model uses Optigear Synt. ALR 150 gear oil. If the oil temperature exceeds 60 ° C for a long time, the maintenance cycle should be shortened.

When changing the oil, the gearbox should be in a warm state. The emission amount depends on the discharge time and oil temperature, and the refilling amount should be consistent with the discharge amount. If the discharge amount is less than 70% of the specified oil amount, the reducer should be flushed with discharge oil; If it is less than 50%, it should be rinsed twice. Move the axis at a jog speed throughout the entire axis range during flushing. The tightening torque of the magnetic plug should be confirmed according to the model and position. Pay attention to hot oil burns and oil chamber pressure during operation, and exhaust before draining the oil.

Balance cylinder inspection and replacement

The balance cylinder is a hydraulic and pneumatic component between the turntable and the connecting rod arm, used to reduce the torque of shaft 2. During inspection, manually run A2 to -90 °, wait for 1 minute, press emergency stop, and read the pressure gauge. The pressure should be 176 bar ± 15 bar at 20 ° C. If the pressure is abnormal, a dedicated pressure gauge should be used for retesting and KUKA service should be contacted. Check whether the corrugated pipe is dirty, damaged, or leaking, and clean or replace it if necessary.

Replacing the balance cylinder is a high-risk operation. The balance cylinder weighs about 40 kg and is under pressure. Wear protective gloves and secure with slings and cranes during homework to prevent falls and accidental movements. The steps include: loosening the threaded clamp and pushing back the corrugated pipe; Move the upper arm forward by -95 ° and install it into the spacer block; Move the boom in a negative direction to secure the spacer block; Fix the balance weight and boom with a sling; Remove the cover plate and turntable bolts; Use a bolt fastener and a bolt puller to remove the bolt; Push the balance weight out of the turntable bolt; Lift it to a safe location. When installing a new balance cylinder, follow the reverse order. After completion, check the pressure and put it back into operation.

Motor replacement process

Before replacing the motor, it is necessary to comply with 5 electrical safety regulations: cutting off the power supply, locking to prevent restart, confirming no voltage, grounding and short circuiting, covering or isolating adjacent live parts. Simultaneously press the emergency stop button to prevent the robot from accidentally moving. When the motor is just stopped, the surface temperature is high and protective gloves should be worn; There is a risk of crushing during disassembly and assembly, and protective gloves should also be worn.

When replacing the motor, first remove the TORX screws from the motor cover, unplug the XM and XP plugs, unscrew the hexagonal socket bolt, and lift out the motor. Clean the teeth before installing the new motor, apply a small amount of Microlube GL 261, and check the O-ring and support ring. Install the hexagon socket screws and tighten them diagonally step by step. Connect the plug, remove the stopper, calibrate the zero point, and conduct T1 testing. The replacement steps for motors with different axes may vary slightly, but the core logic is consistent. All motors must undergo zero point calibration and T1 trial operation after replacement.

Stop distance and stop time

The stopping distance and stopping time are related to the load, program multiplier, range of action, and type of shutdown. STOP 0 immediately closes the drive and the brake is applied; STOP 1 is to brake along the trajectory and turn off the drive after reaching a standstill. KR 120 R2700-2 has a stopping distance of approximately 68.54 ° and a stopping time of approximately 1.02 seconds for A1, 32.64 ° and 0.61 seconds for A2, and 40.09 ° and 0.53 seconds for A3 under 100% operating range, 100% POV, and rated load. KR 180 R2900-2 has an A1 of approximately 61.47 ° and 1.00 seconds, an A2 of approximately 36.00 ° and 0.73 seconds, and an A3 of approximately 46.55 ° and 0.63 seconds. KR 240 R2900-2 has an A1 of approximately 57.23 ° and 1.01 seconds, an A2 of approximately 24.26 ° and 0.54 seconds, and an A3 of approximately 35.21 ° and 0.49 seconds. Regular retesting should be conducted on site based on load, speed, and brake wear, and it is recommended to check at least once a year.

Common troubleshooting ideas

On site troubleshooting should follow the principles of "safety first, power outage confirmation, record analysis, and step-by-step verification". Firstly, trigger the emergency stop, turn off the main switch and lock and tag, and confirm that the system has been discharged. Then check the controller diagnostic information, safety circuit, drive enable, RDC communication, encoder, and cable connections.

Unable to activate or emergency stop alarm: Check the enable switch, emergency stop button, safety door, light barrier, KCP/smartPAD connection. The disconnected smartPAD must be immediately removed from the system to avoid confusion. If an external keyboard or mouse is used, it must meet the requirements of driver shutdown, no one in the danger zone, and KCP/smartPAD cannot be used simultaneously.

Communication interruption or RDC failure: Check if the X20/X30, X21/X31, XF21/XF31 connectors are locked, if the cable bending radius is too small, and if the shielding and grounding are good.

Zero point loss: replace the motor RDC、 After the encoder battery or collision occurs, it is necessary to recalibrate the zero point. After calibration, test under T1 first, and then gradually restore automatic operation.

Abnormal balance cylinder pressure: Check the pressure gauge, leakage points, bellows, and seals. If the pressure is below the allowable range, KUKA service should be contacted and unauthorized pressurization is not allowed.

Overheating or Overload: Check if the load data is entered correctly, if the tool's center of gravity and inertia exceed the limit, if the ambient temperature is too high, if the gear oil is aging, and if the maintenance cycle is overdue. If the oil temperature exceeds 60 ° C, the maintenance interval should be shortened.

Stop distance becoming longer or brake noise: Check brake wear, load, speed, and STOP 0 triggering times. Replace the brake or motor if necessary.

Oil leakage: Check the magnetic plug, seal, oil pipe, and reducer joint surface. When replacing the seal, use spare parts of the same specification and tighten them according to the torque.

Abnormal noise or shaking during movement: Check the lubrication of the teeth, gear oil level, bearings, and flange connections. When cleaning the teeth, do not damage the tooth surface. Before installation, check if the teeth are damaged.

Abnormal security function: All security functions must be tested regularly. Enable the switch to be checked at least once every 12 months. After the safety function or protective device is disabled, it must be immediately restored and functional testing must be conducted.

Storage, Disposal, and Options

Before long-term storage, the robot should be moved to the transport position, tools and accessories should be removed, cleaned and dried, rust should be removed, electrical interfaces and hose joints should be sealed, covered with film and sealed at the base to prevent dust, and desiccants should be placed if necessary. The storage environment should be dry, dust-free, avoid temperature differences, wind, condensation, and direct sunlight, and maintain an allowable temperature range.

When disposing of waste, classify according to materials: cast iron parts such as base, turntable, connecting rod arm, arm, wrist; Copper is used for cables; Light metal castings are used for the housing of spur gearboxes and rotating housings; Steel is used for gearboxes, bolts, washers, connecting shafts, and bearings; Electronic components such as RDC are recycled as electronic waste; The motor is scrapped as a whole and will not be disassembled. Plastic parts such as ETFE, PA, PE, PU, PUR, FKM, etc. shall be treated according to the material markings. Hydraulic and pneumatic balance cylinders must be professionally depressurized in advance and are only allowed to be disposed of in a non pressurized state. Gear oil, hydraulic oil, and lubricating grease should be handled according to the requirements of the safety data sheet.

In terms of options, the release device can be used to manually move the robotic arm after an accident or malfunction, covering motors A1 to A5. A6 motor cannot be used due to being inaccessible. After use, all axes must undergo zero point calibration, brake testing, and a trial run at T1. Hollow shaft A1 cover plate, cable group cover plate, and PURGE options A/B/C/D can be selected according to the on-site environment.

Overall, the stable operation of KUKA KR QUANTEC-2 relies on standardized installation, correct load data, regular oil changes, balance cylinder pressure checks, and timely troubleshooting. On site engineers should incorporate transportation posture, foundation fixation, grounding, oil change volume, torque value, and T1 testing into standard operating procedures to reduce downtime risks and extend the service life of robots.