V&T Technologies Co., Ltd.
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Chapter 7 Fault Diagnosis
126
Failure No.
Failure code
Failure description
Potential causes
Solutions
The parameters are
directly downloaded
without undergoing copy
and upload operations.
Perform download before
uploading the parameters
Control board software
version incompatible
Check if d1.09 is consistent
36
E.dL4
Expansion card
connection abnormal
Expansion card connection
is loosened
Ask professional technicians to
maintain
Expansion card failure
Seek for technical support
37
E.IoF
Terminal mutual
exclusion check
failed
The functions of X1 to X7,
AI1, AI2 and DI terminals
are set in a repeated
manner
Modify the settings of X1 to X7,
AI1, AI2 and DI terminals and
ensure the setting functions
are not repeated (excluding
null function)
38
E.oL3
Hardware overload
protection
Load failure
Check whether motor is
blocked
Replace inverter with proper
model
Input failure
Check whether there is phase
loss
Output failure
Check whether there are
phase loss or short circuit
63
-LU-
Power under voltage
The power voltage is lower
than the minimum
operating voltage of the
equipment
Check input power supply
Abnormal internal
switching power supply
Seek for technical support