The use of Mitsubishi AC servo system is mainly composed of three series: MR-ES, MR-J2S, MR-J3. In general, the cause of the fault can be preliminarily determined based on the code displayed on the servo drive, and then troubleshooting:
1、AL. E6 - Indicates servo emergency stop. There are generally two reasons for this fault, one is that the 24V power supply of the control loop is not connected, and the other is that the EMG and SG of the CN1 port are not connected.
2. AL.37 - parameter abnormality. The internal parameters are disordered, the operator sets the parameters incorrectly, or the drive is caused by external interference. The general parameters can be solved by restoring them to the factory value.
3. AL.16-encoder failure. The internal parameters are out of order, or the encoder line is faulty, or the motor encoder is faulty. If the fault persists, the driver backplane is damaged.
4. AL.20-encoder failure. Caused by motor encoder failure, cable breakage, loose connectors, etc. Replace the encoder line or servo motor encoder. When this fault occurs in the MR-J3 series, there is another possibility that the CPU ground wire of the driver is burned.
5. AL.30 - abnormal regenerative braking. If an alarm occurs as soon as the power is applied, the internal brake circuit element of the drive is damaged. If it occurs during operation, the wiring of the braking circuit can be checked, and if necessary, the braking resistor can be externally equipped.
6. AL.50, AL.51 - overload. Check whether the output U, V, W three-phase sequence wiring is correct, and the three-phase coil of the servo motor is burned out or the ground is faulty. Monitor whether the load rate of the servo motor exceeds 100% for a long time, the servo response parameters are set too high, and resonance is generated.
7、AL. E9 - The main circuit is disconnected. Check whether the power supply of the main circuit is connected, if it is normal, the main module detects the circuit fault, and the driver or accessories must be replaced.
8. AL.52 - The error is too large. Motor encoder failure or driver output module circuit components are damaged, usually in the use of more oil stains, this fault is more common.
In addition, a simple way to judge the fault of the servo motor: after removing all the wiring of the motor, rotate the motor bearing, if you can feel the obvious resistance, the rotation is not smooth, the fuselage coil is burned out, and the coupling is not properly assembled, it is easy to knock out the encoder, you can shake the motor encoder part, if you can hear the sound of the encoder fragments, the encoder is knocked out.
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