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Chapter 7 Fault Diagnosis
123
Failure No.
Failure code
Failure description
Potential causes
Solutions
Fan failure
Check whether fan wirings are
well connected.
Replace a new fan of the same
model
Rectifier module failure
Seek for technical support
Temperature detection
circuit failure
Seek for technical support
13
E.oL1
Inverter overload
protection
Input power under voltage
Check input power supply
Fast start-up when motor
operates with high speed
Start again after the motor stop
rotating
Keep overloading for a
long period of time
Shorten the overloading time
and reduce load
Acceleration and
deceleration time is too
short
Prolong the
acceleration/deceleration time
V/F curve ratio is set too
large
Adjust V/F curve setting and
torque boost
Power level of inverter is
small
Replace to inverter with proper
model
14
E.oL2
Motor overload
protection
Input power under voltage
Check input power supply
Motor rotation is blocked or
load mutation occurs
Prevent the motor rotation from
blocking and reduce the load
mutation
Common motor maintains
running under heavy load
for a long period of time
Replace the common motor
with variable frequency motor
or improve the running
frequency
Motor overload protection
time is set too small
Increase the motor overload
protection time
V/F curve ratio is set too
large
Adjust V/F curve setting and
torque increment
DC braking current is set
too high
Reduce the DC brake current
15
E.oUt
Peripheral protection
External failure terminal
enable
Check the external failure
terminal status
Stall over voltage or over
current and the time lasts
for more than one minute
Check whether the external
load is normal
19
E.CUr
Current detection
fault
Current detection circuit
failure
Seek for technical support
20
E.GdF
Output to ground
short circuit
Wrong connection
Correct the connection error as
per the user’s manual
Motor failure
Replace the motor after
performing ground insulation
test
Invert module failure
Seek for technical support
Ground leakage current at
the output side of the
inverter is too high
Seek for technical support
21
E.LV1
Abnormal power
failure during running
Mains power fluctuation or
momentary power failure
Check the local mains power
22
E.ILF
Input power failure
There is abnormal
connection, missing
connection or
disconnection at the power
terminal of the inverter
Check the power connections
as per the operational
regulations and eliminate the
errors of missing connection
and disconnection
