Veichi AC80T Manual page 40

5.3 Fault diagnoses process
System fault diagnoses process
Clear short circuit
Short the cable or
add outout reactor
Clear disturbance
Connect load and
operate as follows
Reduce load or
enhance power
Display E.SC
while start
yes
Torque enhance value
is suitable or not
no
Torque enhance
valuecan be
reduced or not
yes
Reduce
yes
Whether there is short circuit between outout terminal U/V/W and the motor
yes
Cable between output terminal U/V/W and motor
is too long that leakage current cause inverter protection
yes
Is there serious electromagnetic disturbance?
While disconnect output wire and run,whether there is system fault alarm
yes
Three phase outout voltage balance is ok or not?
yes
no
no
Display E.SC
while stop
yes
yes
Whether acceleration
time is too short
yes
no
ACC time can be
prolonged or not
yes
Prolong setting time
Reduce load or
enhance power
AC80T Tower Crane Purpose VFD Manual
system fault
no
no
no
no
yes
Whether overload or not?
no
Display E.SC while
constant speed
no
Whether deceleration
time is too short
yes
Dec time can be
prolonged or not
yes no
Check braking mode,
seek tec support
Inverter fault or misaction caused by
noises.Pls find technic support
39
yes
no
no
yes
Display E.SC while
machine stop
yes
no
Whether load
change suddently
yes
Reduce load change
or enhance power