Basic knowledge of servo drives

As an important part of industrial control equipment, servo drives are the core of achieving high-precision and high-efficiency motion control. This article aims to help everyone understand the basic principles and working methods of servo drives, master the causes of common faults and repair methods, thereby effectively improving the efficiency and quality of maintenance services.

Ⅰ. A servo driver generally consists of a power supply, main circuit, drive circuit, detection and protection circuit, control circuit, speed feedback circuit, etc. It is a closed-loop control system.

Ⅱ. Common faults of servo drives include

No power supply, input and output phase loss, overcurrent, overload, overvoltage, overheating, undervoltage, short circuit, grounding, etc.

1. There may be several reasons for these failures.

2. No power supply: This may be caused by a faulty power line, tripped circuit breaker, faulty power module, etc.

3. Input and output phase loss: It may be caused by power line problems, poor contact, relay failure, etc.

4. Overcurrent: It may be caused by unstable power supply, overload, motor failure, control system failure, driver internal component failure, etc.

5. Overload: It may be caused by unreasonable system design, sudden load changes, unreasonable overload protection parameter settings, etc.

6. Overvoltage: It may be caused by power fluctuations, grid problems, internal faults of the driver, etc.

7. Overheating: It may be caused by excessive ambient temperature caused by dust and oil in the environment, poor heat dissipation, fan failure, internal component failure of the drive, etc.

8. Undervoltage: It may be caused by power supply problems, line damage, power grid fluctuations, etc.

9. Short circuit: It may be caused by line short circuit, component aging, internal component failure, etc.

10. Grounding problem: It may be caused by grounding line problems, poor connections, poor equipment installation environment, etc.

Ⅲ. Some recommended servers

1.ABB server

2.FANUC server

3.KUKA server

4.YASKAWA server

According to rough statistics based on experience, there are 30% power supply failures, 30% drive circuit failures, 30% detection circuit failures, and 10% motherboard failures.