WEG W21 - Page 10

10 | W21 Magnet Drive System
®
Quick Guide
E.oU2
Dec over-
voltage
●
Deceleration time is too
short.
●
Load potential energy or
inertia is too large.
●
Power voltage fluctua-
tion 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
speed
over-
voltage
●
Power voltage fluctua-
tion over limit.
●
Detect input power voltage and
eliminate fault.
●
Install input reactor.
E.oU4
Over-vol-
tage when
stop
●
Power voltage fluctua-
tion over limit.
●
Check input power, eliminate fault.
●
Seek support from vendor.
E.oC1
Acc over-
-current
●
Acceleration time is too
short.
●
Start motor when run-
ning.
●
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 F1.00 to 1or 2.
●
Reset V/F curve or torque boost
value.
●
Select inverter with right capacitan-
ce.
E.oC2
Dec over-
-current
●
Deceleration time is too
short.
●
Load potential energy or
inertia is too large.
●
Power voltage fluctua-
tion over limit.
●
Prolong deceleration time.
●
Connect external braking resistan-
ce or braking unit.
●
Select inverter with right capacitan-
ce.
E.oC3
Constant
speed
over-
-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.
●
Wrong overload protec-
tion setting.
●
Locked-rotor run or too
heavy load.
●
Universal motor runs at
low speed for a long time
●
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 long-term low-speed operation
is needed, please choose special
motor for inverter.