V&T Technologies Co., Ltd.
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Chapter 7 Fault Diagnosis
110
Failure
No.
Failure
code
Failure
description
Potential causes
Solutions
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
16
E.ot1
Arrive user setting
continuous
running time
The inverter running time exceed user setting
continuous running time
Find the technician who setting
this papameter
17
E.ot2
Arrive User
summation
running time
The inverter running time exceed user setting
summation running time
Find the technician who setting
this papameter
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
Serious unbalance of input power at three
phases
Check whether the unbalance of
input power at three phases
comply with the requirements
Burning of capacitor of the inverter
Seek for technical support
The power
−
on buffer circuit of the inverter is
faulty
Seek for technical support
23
E.oLF
Abnormal output
phase loss
There is abnormal connection, missing
connection or disconnection at the output side
of the inverter
Check the power connections at
the output side of the inverter as
per the operational regulations
and eliminate the errors of
missing connection and
disconnection
