Matrix T50x-02, Service Manual

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7.15 Error message 01A4 / 01A5 / 01A6 / 02A7 troubleshooting
Figure A
[Symptom ]
01A4 - Main motor U phase disconnection
01A5 - Main motor V phase disconnection
01A6 - Main motor W phase disconnection
02A7 - Inverter output side is detected abnormal sudden increase over current
[Solution]
a. Please check the Motor wire connection between the Motor and MCB. (Figure A)
b. Please use the electric meter to check the 3 points (U / V / W) and see if there’s data of inside
impedance. (Figure B~C)
If yes, replace MCB.
If no, replace Motor set.
W & V (Figure B)
W & U (Figure C)
V & U (Figure D)