AC80T Tower Crane Purpose VFD Manual
36
E.oU2
Dec
over-voltag
e
●
Deceleration time is
too short.
●
Load potential energy
or inertia is too large.
●
Power voltage
fluctuation over limit.
●
Prolong deceleration time
properly.
●
Reduce load inertia or
improve inverter
capacitance or add
braking unit.
●
Detect input power and
clear fault.
E.oU3
Constant
speedover-
voltage
●
Power voltage
fluctuation over limit.
●
Detect input power voltage
and eliminate fault.
●
Install input reactor.
E.oU4
Over-volta
ge while
stop
●
Power voltage
fluctuation over limit.
●
Check input power,
eliminate fault.
●
Seek support from factory.
E.oC1
Acc
over-curren
t
●
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
stops. Set F1.00 as 1or 2.
●
Reset V/F curve or torque
boost value.
●
Select inverter with right
capacitance.
E.oC2
Dec
over-curren
t
●
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
speedover-
current
●
Sudden load change.
●
Power grid voltage is
too low.
●
Check load change and
eliminate it.
●
Check input power,
eliminate fault.
E.oL1
Motor
over-load
●
V/F curve setting is not
suitable. Or torque
boost too high.
●
Power grid voltage is
too low.
●
Unright 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,
eliminate fault.
●
Unreasonable F5.06
setting.
●
Adjust load or select
inverter with right
capacitance.
●
If need long low-speed
operation, please choose
special motor for inverter.
