The servo system includes servo drive and servo motor. The drive uses precise feedback combined with high-speed digital signal processor DSP to control the IGBT to generate accurate current output. It is used to drive the three-phase permanent magnet synchronous AC servo motor to achieve precise speed regulation and positioning. Compared with ordinary motors, because the AC servo drive has many protection functions inside, and the motor has no brushes and commutators, it is reliable, and the maintenance and maintenance workload is relatively small.
In order to extend the working life of the servo system, the following issues should be noted during use. For the environment in which the system is used, the five elements of temperature, humidity, dust, vibration, and input voltage must be considered. Regularly clean the cooling and ventilation system of the numerical control unit. Always check whether the cooling fans on the CNC are working properly. The cleaning shall be checked every six months or quarters depending on the environmental conditions of the workshop.
When the CNC machine tool is idle for a long time, the CNC system should be regularly maintained. First of all, the CNC system should be energized frequently, and let it run at no load when the machine is locked. In the rainy season with high air humidity, it should be energized every day. The heat of the electrical components itself is used to drive away the moisture in the CNC cabinet to ensure the stable and reliable performance of the electronic components. Practice has proved that the machine tools that are often used are not used. After the rainy days, it is easy to have various failures when starting up.
Due to the working conditions of the end users of the motion control system and the limitations of the technical support capability of the first-line engineering of the enterprise, the electromechanical system is often unable to obtain good equipment management, and the life cycle of the mechatronics equipment is shortened, and the capacity is reduced due to equipment failure. Loss of economic benefits.
The servo drive is a kind of controller used to control the servo motor. Its function is similar to that of the inverter acting on the common AC motor. It is part of the servo system and is mainly used in high-precision positioning systems. Generally, the servo motor is controlled by three modes: position, speed and torque to realize high-precision transmission system positioning. At present, it is a high-end product of transmission technology. So how to test and repair the servo drive, here are some methods:
1. When the oscilloscope checks the current monitoring output of the driver, it is found to be all noise and cannot be read.
Fault reason: The current monitoring output is not isolated from the AC power supply (transformer)
Treatment method: It can be observed with a DC voltmeter.
2. The motor runs faster in one direction than the other.
1. Cause of failure: The phase of the brushless motor is wrong.
Treatment: Detect or find the correct phase.
2. Cause of failure: When not used for testing, the test/bias switch is placed at the test position.
Treatment method: Put the test/deviation switch in the deviation position.
3. Cause of failure: The position of the deviation potentiometer is incorrect.
Processing method: Reset.
3, motor stall
1. Cause of failure: The polarity of the speed feedback is wrong.
Approach:
a. If possible, turn the position feedback polarity switch to another position. (can be on some drives)
b. If using a tachometer, connect the TACH+ and TACH- on the drive.
c. If using an encoder, connect ENC A and ENC B on the drive.
d. If in HALL speed mode, reverse the HALL-1 and HALL-3 on the drive, and then connect the Motor-A and Motor-B pairs.
2. Cause of failure: When the encoder speed feedback, the encoder power supply loses power.
Solution: Check the power supply of the 5V encoder. Make sure that the power supply provides enough current. If using an external power supply, make sure that the voltage is signaled to the drive.
4, the LED light is green, but the motor does not move
1. Cause of failure: The motor in one or more directions is prohibited from operating.
Solution: Check the +INHIBIT and –INHIBIT ports.
2. Cause of failure: The command signal is not signaled to the driver.
Processing method: connect the command signal ground and the driver signal ground.
5. After power-on, the LED of the driver is not lit.
Cause of failure: The supply voltage is too low, less than the minimum voltage requirement.
Treatment: Check and increase the supply voltage.
6. When the motor rotates, the LED light flashes.
1. Cause of failure: HALL phase error.
Solution: Check if the motor phase setting switch (60 /120) is correct. Most brushless motors are 120 steps out of phase.
2. Cause of failure: HALL sensor failure
Treatment method: Detect the voltage of Hall A, Hall B, Hall C when the motor rotates. The voltage should be between 5 VDC and 0.
7, LED lights always keep red
Cause of failure: There is a fault.
Solution: Cause: Overvoltage, undervoltage, short circuit, overheat, drive disable, HALL invalid.
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