AC70 VC CONTROL FREQUENCY INVERTER MANUAL
FAULT DIAGNOSES AND PROCESSING
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5.3 Fault Diagnoses Process
System fault diagnoses process
reduced or not
valuecan be
system fault
yes
yes
yes
yes
yes
yes
yes
yes
yes
yes
yes
yes
yes
yes
yes
yes
yes
yes
no
no
no
no
no
no
no
no
no
no
no
no
no
no
Clear short circuit
Whether there is short circuit between outout terminal U/V/W and the motor
Short the cable or
add outout reactor
Cable between output terminal U/V/W and motor
is too long that leakage current cause inverter protection
Clear disturbance
Is there serious electromagnetic disturbance?
While disconnect output wire and run,whether there is system fault alarm
Three phase outout voltage balance is ok or not?
Whether overload or not?
Connect load and
operate as follows
Reduce load or
enhance power
Display E.SC
while start
Display E.SC
while stop
Display E.SC while
constant speed
Display E.SC while
machine stop
Torque enhance value
is suitable or not
Whether acceleration
time is too short
Whether deceleration
time is too short
Whether load
change suddently
Torque enhance
ACC time can be
prolonged or not
Dec time can be
prolonged or not
Reduce load change
or enhance power
Reduce
Prolong setting time
Check braking mode,
seek tec support
Reduce load or
enhance power
Inverter fault or misaction caused by
noises.Pls find technic support
