E1—Hardware over-current

(Motor over-current, PB_FLT protection signal effective)

Steps:
check the motor well or not:  check whether it’s short-circuit between the pin4 and the Pin 1,2,3 by Using Ω channel of multimeter, check whether the impedance of U3 ,V2,W1 of three phase motor is the same
Check whether the motor angle correct or not: press “S” key 2s to enter monitor interface, enter DJ interface and press “S” to check if the motor angle in the range of 252 ±5, (if the deviation of motor angle is too big, then motor acceleration or scram will cause large current or ​​speed uncontrolled phenomena)
check the impedance of pin 1 / pin3 of Q3~Q8: around 10K.
check the impedance of pin 2~7 to pin12 of U8 of main control board: around 0.7M, standby voltage: 3.8V
check the impedance of pin14/15/16 to pin12 of U8 of main control board: around 10K, standby voltage: 0V
check the R169 impedance value of U8 of main control board: 1K; C101 both ends impedance: 6.5K. standby voltage: 3.2V.
check the impedance of pin1 to pin12 of U8 of main control board: around 1.6M, standby voltage: 15V
check the impedance of pin1,7 to pin4 of U20 of main control board: around 13.5K, standby voltage: 1.46V
Check if the grating loose, or if sensors in encoder board rub with each other.