Several effective tips for servo motor drive repair

1. When the Panasonic digital AC servo system is powered on, the motor vibrates and makes a lot of noise, and then the driver gives an alarm No. 16, what should I do?

This phenomenon is generally due to the driver's gain setting is too high, resulting in self-oscillation. Please adjust parameters No.10, No.11, and No.12 to appropriately reduce the system gain. (Please refer to the content of gain adjustment in the "Instruction Manual")

2.Why the No. 22 alarm appears when the Panasonic AC servo drive is powered on?

It is an encoder failure alarm, and the general reasons are: A. There is a problem with the encoder wiring: disconnection, short circuit, wrong connection, etc.; B. There is a problem with the encoder on the motor: misalignment, damage, etc..

3. When the Panasonic servo motor is running at a very low speed, it is fast and slow at times like crawling, what should I do?

The servo motor with low-speed creeping phenomenon is generally caused by the system gain being too low. Please adjust the parameters No.10, No.11, and No.12 to properly adjust the system gain, or run the driver's automatic gain adjustment function. (Please refer to the content of gain adjustment in the "Instruction Manual")

4. In the position control mode of the Panasonic AC servo system, the control system outputs pulse and direction signals, but whether it is a forward rotation command or a reverse rotation command, the motor only rotates in one direction. Why?

Panasonic AC servo system can receive three kinds of control signals in position control mode: pulse/direction, forward/reverse pulse, A/B quadrature pulse. The factory setting of the drive is A/B quadrature pulse (No42 is 0), please change No42 to 3 (pulse/direction signal).

5. In the use of Panasonic AC servo system, is it possible to use servo-ON as a signal to control the motor offline so as to directly rotate the motor shaft?

Although the motor can be offline (in a free state) when the SRV-ON signal is disconnected, do not use it to start or stop the motor. Frequent use of it to switch the motor may damage the drive. If you need the offline function, you can use the switching of the control mode to achieve: assuming that the servo system needs position control, you can set the control mode selection parameter No02 to 4, that is, the first mode is position control, and the second mode is torque control. Then use C-MODE to switch the control mode: When performing position control, make the signal C-MODE open to make the drive work in the first mode (i.e. position control); when it needs to be offline, make the signal C-MODE close, and the drive work in the second mode (i.e. torque control). Since the torque command input TRQR is not wired, the motor output torque is zero, thus achieving offline.

6. When the Panasonic AC servo system is used under analog control mode, the position signal is fed back to the computer for processing by the pulse output of the driver. When the machine is installed and debugged, the motor will run away condition when a motion command is issued. What is the reason?

This phenomenon is caused by the wrong phase sequence of the A/B quadrature signal fed back to the computer by the pulse output of the driver and the formation of positive feedback. The following methods can be used to deal with: A. Modify the sampling program or algorithm; B. Swap A+ and A- (or B+ and B-) of the pulse output signal of the driver to change the phase sequence; C. Modify the drive parameter No45 and change the phase sequence of its pulse output signal.

7. It was found that the Panasonic AC servo system had some interference to our own testing equipment. What methods should generally be taken to eliminate it?

The AC servo drive is a relatively prominent source of interference in the control and detection system because of adopting the inverter principle. The following methods can generally be used to eliminate the interference to other equipment: A. The grounding terminals of the drive and the motor should be grounded reliably; B. Add isolation transformer and filter to the power input of the driver; C. Use shielded cable. There is no fixed method to eliminate the interference completely and effectively. Usually, experience and experimentation are very helpful.

8. Why doesn't the servo motor lose steps?

The servo motor driver receives the feedback signal of the motor encoder and compares it with the command pulse to form a semi-closed loop control of the position. Therefore, the servo motor will not lose steps, and every command pulse can be reliably responded.

9. How to solve the power supply problem of Panasonic servo?

At present, almost all AC servo motors produced in Japan are powered by three-phase 200V. The domestic power supply standards are different, so the following methods must be used to solve them: A. For AC servos below 750W, in general, single-phase 220V can be directly connected to the L1 and L3 terminals of the drive; B. For other types of motors, it is recommended to use a three-phase transformer to change three-phase 380V into three-phase 200V, and connect to L1, L2, L3 of the drive.

10. What should be paid special attention to when mechanically installing the servo motor?

Since each servo motor is equipped with a rotary encoder at the back end, it is a very fragile precision optical device, and excessive impact will definitely damage it.

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Related Info

Several effective tips for servo motor drive repair

1. When the Panasonic digital AC servo system is powered on, the motor vibrates and makes a lot of noise, and then the driver gives an alarm No. 16, what should I do?

2.Why the No. 22 alarm appears when the Panasonic AC servo drive is powered on?

3. When the Panasonic servo motor is running at a very low speed, it is fast and slow at times like crawling, what should I do?

4. In the position control mode of the Panasonic AC servo system, the control system outputs pulse and direction signals, but whether it is a forward rotation command or a reverse rotation command, the motor only rotates in one direction. Why?

5. In the use of Panasonic AC servo system, is it possible to use servo-ON as a signal to control the motor offline so as to directly rotate the motor shaft?

7. It was found that the Panasonic AC servo system had some interference to our own testing equipment. What methods should generally be taken to eliminate it?

8. Why doesn't the servo motor lose steps?

9. How to solve the power supply problem of Panasonic servo?

10. What should be paid special attention to when mechanically installing the servo motor?

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Several effective tips for servo motor drive repair

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What are the advantages of CDHD2 high-performance servo drive?

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Maintenance of servo drive

Function of servo drive

Working principle of servo drive

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