E17—-Motor reversion

（The speed of reversion 100ms >750rpm higher than alarm value）

Trouble shooting procedure
1) Check the angle of motor whether in right position; Check the supervisory interface of operation panel DJ【check the angle whether the angle is in the range 252±5】【Too big angle will cause over current and over speed when motor accelerate and sudden stop】
2 )  Check the grating plate on motor whether it is loose and check whether there is friction between grating plate and sensor.
3 )  To check the encoder whether it is into dust
4）  Cable pin of motor power plug 1X4 loose cause mistake of 3 phases.