Universal Robots – common faults and repair methods for six-axis robots

1. Clean first and then repair

For the electrical equipment with heavy pollution, first clean the buttons, wiring points, and contact points, and check whether the external control keys are out of order. Many faults are caused by dirt and conductive dust blocks, and are often eliminated once cleaned.

2. Power supply before equipment

The failure rate of the power supply part of the six-axis robot accounts for a high proportion of the entire faulty equipment, so overhauling the power supply first can often get twice the result with half the effort.

3. First universal then then

Failures caused by the quality of six-axis robot assembly accessories or other equipment failures generally account for about 50% of common failures. The faults of electrical equipment are mostly soft faults, which need to be measured and repaired by experience and instruments. For example, there is a 0.5kW electric motor that cannot carry a load, and some people think that it is a load failure. As a rule of thumb, wear thicker gloves and grasp in the direction of rotation of the motor, and as a result, you get caught, and this is the problem with the motor itself.

4. Periphery first and then interior

Do not rush to replace the damaged electrical parts first, and consider replacing the damaged electrical parts after confirming that the peripheral equipment circuits are normal.

5. DC first and then AC

When overhauling, check the static working point of the DC circuit first, and then check the dynamic working point of the AC circuit.

6. Fault first and then debug

For the electrical equipment with both debugging and faults, the fault should be eliminated first, and then the debugging should be carried out under the premise that the electrical circuit is normal.

7. Mouth before you move

For faulty electrical equipment, do not rush to do it, and should first inquire about the process and failure phenomenon before and after the failure. For unfamiliar equipment, you should also be familiar with the circuit principle and structural characteristics, and abide by the corresponding rules. Before disassembly, you should be fully familiar with the function, location, connection mode and relationship with other surrounding components of each electrical component.

8. Outside first, then inside

The six-axis joint robot equipment should be checked for obvious cracks and defects, and its maintenance history and service life should be understood, and then the machine should be inspected. Before dismantling, the surrounding fault factors should be eliminated and disassembled only after determining the fault in the machine, otherwise, blind disassembly may cause the equipment to be repaired more and more badly.

9. Mechanical first and then electrical

Only after it is determined that the mechanical parts are fault-free, the electrical aspects of the six-axis articulated robot are checked. When checking the circuit fault, the detection instrument should be used to find the fault part, and after confirming that there is no bad contact fault, the operation relationship between the line and the machinery should be checked in a targeted manner to avoid misjudgment.

10. Static first and then dynamic

When the six-axis articulated robot equipment is not powered on, judge the quality of the electrical equipment buttons, contactors, thermal relays and fuses, so as to determine the location of the fault. Power-on test, listen to its sound, measure parameters, judge faults, and carry out maintenance. For example, when the motor is out of phase, if the three-phase voltage value cannot be distinguished, it should be listened to and the relative ground voltage should be measured separately to determine which phase is defective.

Universal Robots – common faults and repair methods for six-axis robots

Universal Robots – common faults and repair methods for six-axis robots

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