
67
Fault
code
Display
code
Fault description
Possible reasons
Actions
Low AC supply voltage
Check the AC supply
voltage
Too low inverter’s power
Select the inverter with
larger capacity
F.oU1
Over voltage in
Acc process
Abnormal AC supply voltage
Check the AC supply
voltage
Too short Acc time
Prolong the Acc time
The inverter is re-started with
a rotating motor
Start when the motor
stops
F.oU2
Over voltage in
Dec process
Too short Dec time (with
reference to generated energy)
Prolong the Dec time
The load inertia is too high
Use suitable dynamic
braking device
F.oU
3
Over voltage
inconstant-speed
operating
process
Abnormal AC supply voltage
Check the AC supply
voltage
Too short Acc/Dec time
Prolong the Acc/Dec
time
Abnormal change of input
voltage
Install input reactor
Too high load inertia
Use suitable dynamic
braking device
F.PoU
Reserved
Reserved Reserved
F.IPL
Reserved
Reserved Reserved
F.oPL
Output phase loss
Output phase failure among
Phase U, V and W
Check the inverter’s
output wiring
Check the cable and the
motor
F.FAL
Inverter
moduleprotection
Instant overcurrent
See User’s manual
Interphase shorted or
groundshorted
Re-wiring
Fan duct blockage or damage
Clear the fan duct or
replace the fan
Ambient temperature is too
high
Lower the ambient
temperature
Panel wiring or plug-ins losse Check and re-wiring