V&T E5 Series, User Manual

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E5 Series High Performance Universal Inverter User’s Manual
124 Chapter 7 Troubleshooting
Fault
No.
Fault
display
on panel
Fault description Possible causes Corrective actions
T3 E.oLT
Inverter overload
protection
Input power under voltage Check input power supply
Start when motor is spinning
Start again after the motor at
standstill
Keep overloading for a long period
of time Shorten the overloading time and
reduce load
Too short acceleration or
deceleration time Prolong the acceleration or
deceleration time
VTF curve setting are not correct
Adjust VTF curve setting and torque
boost
Over load condition
Check the load for an over load
condition
Output power is too small Replace with higher model
T4 E.oLT
Motor overload
protection
Input power under voltage Check input power supply
Motor rotation is blocked or load
suddenly changed
Prevent the motor rotation from
blocking and reduce the load
suddenly changed
Common motor maintains running
under heavy load for a long period
of time Replace the common motor with
variable frequency motor or
increase the running frequency
Motor overload protection time is
set too small Increase the motor overload
protection time
VTF curve ratio is set too large
Adjust VTF curve setting and torque
boost
DC braking current is set too high Reduce the DC braking current
T5 E.oUt
Peripheral
protection
External terminal fault active
Check the external failure terminal
status
Over voltage stall or over current
stall time lasts for more than one
minute
Check whether the external load is
normal
T9 E.CUr
Current detection
fault
Current detection circuit failure Seek for technical support
T0 E.GdF
Output short
circuited to
ground
Wrong connection
Correct the connection error as per
the user manual
Motor abnormal
Replace the motor after performing
ground insulation test
Invert module fault Seek for technical support
Ground leakage current at the
output side is too large
Seek for technical support
TT E.LVT
Abnormal power
off in running
status
Mains power fluctuation or
momentary power failure
Check the mains power supply
TT E.ILF Input power fault
Abnormal connection, missing
connection or disconnection at the
power supply
Check the power connections as
per the operational regulations and
eliminate the errors of missing
connection and disconnection
Serious imbalance of three phases
power supply
Check whether the imbalance of
three phases power comply with
the requirements
Capacitor aging Seek for technical support
Abnormal snubber circuit Seek for technical support