1, Matsushita digital AC servo system MHMA 2KW, when the test machine on a power, the motor vibrates and there is a lot of noise, then the drive appears on the 16th alarm, how to solve?
This phenomenon is generally due to the driver’s gain setting is too high, resulting in self-oscillation. Please adjust the parameters No.10, No.11, No.12, appropriate to reduce the system gain. (Please refer to “User’s Manual” for gain adjustment)
2, Matsushita AC servo drive power on the 22nd alarm, why?
22 alarm is the encoder fault alarm, resulting in the general are:
A. encoder wiring problems: broken, short circuit, then the wrong, etc., please check carefully;
B. There is a problem with the encoder on the motor: misplaced, damaged, etc. Please send for repair.
3, Matsushita servo motor running at a very low speed, fast and slow, like crawling, how to do?
Generally, the low speed creep of the servomotor is caused by too low system gain. Adjust the parameters No.10, No.11 and No.12, adjust the system gain properly, or run the automatic gain adjustment function of the driver. (Please refer to “User’s Manual” for gain adjustment)
4, Panasonic AC servo system Position control mode, the control system is the output pulse and direction signal, but whether it is forward or reverse command, the motor only in one direction, and why?
Matsushita AC servo system in the position control mode, you can receive three control signals: pulse / direction, positive / anti-pulse, A / B orthogonal pulse. The factory setting of the drive is A / B quadrature pulse (No42 is 0). Change No42 to 3 (pulse / direction signal).
5, Matsushita AC servo system, the use of servo-ON can be used as a signal to control the motor offline in order to directly rotate the motor shaft?
Although the motor can be taken offline (in a free state) while the SRV-ON signal is off, 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 to achieve offline function, you can use the control mode to switch to: Suppose the servo system needs position control, you can set the control mode selection parameter No02 to 4, the first mode is position control, the second mode is torque control . Then use C-MODE to switch between control modes: When position control is performed, signal C-MODE is turned on to make the driver work in the first mode (ie, position control); when signal C-MODE is needed to be off, With the drive operating in the second mode (torque control), the motor output torque is zero because the torque command input TRQR is not wired, thus enabling offline operation.
6, Matsushita AC servo used in the CNC milling machine we developed is working under the analog control mode. The position signal is fed back by the pulse output of the driver to the computer for processing. When the motor is installed and debugged, a motion command is issued and the motor drives. What are the causes?
This phenomenon is due to drive pulse output feedback to the computer A / B quadrature signal phase error, the formation of positive feedback caused by the following methods can be used to deal with:
A. Modify sampling procedures or algorithms;
B. The drive pulse output signal A + and A- (or B + and B-) to tune to change the phase sequence;
C. Modify the drive parameter No45 to change the phase sequence of its pulse output signal.
7, we developed a testing equipment, found that Panasonic AC servo system on our detection device has some interference, the general approach should be taken to eliminate?
As the AC servo drive using the inverter principle, so it is in the control and detection system is a more prominent source of interference, in order to reduce or eliminate the servo drive on other electronic devices, generally can be used as follows:
A. The ground terminal of driver and motor should be grounded reliably;
B. The driver’s power input plus isolation transformers and filters;
C. Use shielded wires for all control and detection signal lines.
Interference problem is a difficult problem in electronic technology. There is no fixed way to exclude it completely and effectively. It is usually tried and tested to find anti-jamming measures.
8, why the servo motor will not lose step?
The servomotor driver receives the feedback signal from 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 the phenomenon of losing every command pulse can be a reliable response.
9, how to consider Panasonic servo power supply problem?
At present, almost all Japanese-made AC servo motors are three-phase 200V power supply, different domestic power standards, it must be resolved as follows:
A. For 750W AC servo, under normal circumstances can be directly connected to the single-phase 220V L1, L3 drive;
B. For other types of motors, it is recommended to use a three-phase transformer to convert three-phase 380V into three-phase 200V and connect to L1, L2 and L3 of the driver.
10, the servo motor for mechanical installation, should pay special attention to what?
Since each servomotor is equipped with a rotary encoder at the rear end, it is a very fragile precision optics that is surely damaged by excessive impact.
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