AC70 VC CONTROL FREQUENCY INVERTER MANUAL
FAULT DIAGNOSES AND PROCESSING
51
E.oU4
Over-voltage
while stop
●
Power voltage fluctuation
over limit.
●
Check input power,clear
fault.
●
Seek support from factory.
E.oC1
Accel.
over-current
●
Acceleration time is too
short.
●
Start running motor.
●
V/F curve setting is not
suitable.Or torque boost too
high.
●
Inverter capacitance is too
small.
●
Prolong acc time.
●
Restart motor until it totally
stop.Set E-30 as 1or2.
●
Reset V/F curve or torque
boost value.
●
Select inverter with right
capacitance.
E.oC2
Decel.
over-current
●
Deceleration time is too
short.
●
Load potential energy or
inertia is too large.
●
Power voltage fluctuation
over limit.
●
Prolong Deceleration time.
●
Connect external braking
resistance or braking unit.
●
Select inverter with right
capacitance.
E.oC3
Constant
speed
over-current
●
Sudden load change.
●
Power grid voltage is too
low.
●
Check load change and
clear it.
●
Check input power,clear
fault.
E.oL1
Motor
over-load
●
V/F curve setting is not
suitable. Or torque boost too
high.
●
Power grid voltage is too
low.
●
incorrect overload
protection setting.
●
Locked-rotor run or too
heavy load.
●
Universal motor long time
low speed run.
●
Reset V/F curve or torque
boost value.
●
Check input power,clear
fault.
●
Unreasonable H-56 setting.
●
Adjust load or select
inverter with right capacitance.
●
If need long time low speed
run,please choose special
motor for inverter.
E.oL2
Inverter
over-load
●
Load is too heavy.
●
Acceleration time is too
short.
●
Start running motor.
●
V/F curve setting is not
suitable.Or torque boost too
high.
●
Select inverter with right
capacitance.
●
Prolong acceleration time
●
Restart motor until it totally
stop.Set E-30 as 1or2.
●
Reset V/F curve or torque
boost value.
E. SC
System
abnormality
●
Acceleration time is too
short.
●
Short circuit between
inverter output phases or earth.
●
Module is damaged.
●
Electromagnetic disturb.
●
Prolong acceleration time.
●
Check periphery
equipments and restart after
fault cleared.
●
Seek support from factory.
●
Check system wiring,