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Chapter 7 Fault Diagnosis
124
Failure No.
Failure code
Failure description
Potential causes
Solutions
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
Unbalance of output three
phases
Check whether motor is kept
well
Shut down the power supply to
check whether the terminal
characteristics both at the
output side and DC side of the
inverter are consistent
24
E.EEP
EEPROM failure
EEPROM reading and
writing failure
Seek for technical support
25
E.dL3
Relay contact failure
Loose connection of
connectors inside the
inverter
Ask professional technicians to
maintain
The power-on buffer circuit
is faulty
Seek for technical support
26
E.dL2
Temperature
sampling
disconnection
Ambient under
temperature
Check whether the ambient
temperature complies with the
requirements
The temperature sampling
circuit inside the inverter is
faulty
Seek for technical support
27
E.dL1
Encoder cable
disconnection
Encoder connection is
incorrect
Change the encoder cable
connection
Encoder has no signal
output
Check whether the encoder
and power supply are normal.
Encoder cable
disconnection
Reconnect
Abnormal function code
setting
Confirm that the relevant
function codes of the encoder
are set properly
28
E.P10
+10V power output
abnormal
+10V power overload
In10V power load
impedance
Utilize externally independent
power supply
+10V power supply and
GND is short circuited
Eliminate the short circuit
failure
+10V power terminal
circuit failure
Seek for technical support
29
E.AIF
Analog input
abnormal
Analog input voltage is too
high
Check whether the analog
input voltage complies with the
requirements
Analog input circuit failure
Seek for technical support
Analog input circuit signal
interfered
Increase the P6.22
～
P6.24 AI
filtering time
