Veichi SI23 - Chapter 4 Fault Diagnosis and Solution; Fault and Alarm Troubleshooting

SI23 Solar Pump VFD Manual
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Chapter 4 Fault Diagnosis and Solution
This chapter describes the VFD fault, alerts, and operation of the failure on the VFD, the display information on VFD and
countermeasures.
Fault Information and Description in Detail
Keypad
display
Fault code
Fault type
Possibility reason
Troubleshooting
E.LU2
Under voltage
at runs
●Power voltage too low
●DC main contactor don’t
close
●Check input power to solve
●Ask support
E.oU1
Over voltage at
acceleration
●Power voltage fluctuation
over limit
●Too start rotating motor
●Check power grid
●Restart until motor is stop
completely, or set [F1.00] set for 1 or
2
E.oU2
Over voltage
during
deceleration
●Deceleration time too small
●The driving load too heavy
●Power voltage fluctuation
over limit
●Prolong deceleration time
●Reduce the load, or select bigger
capacitor drive, or connect braking
unit
●Check input power
E.oU3
Overvoltage at
constant speed
●The input voltage is too high
●An external force drives the
motor during deceleration
●Adjust the voltage to
normal range
●Cancel the external force or install
the braking resistor
E.oU4
Over voltage at
stop
●Voltage fluctuate above limit
●Check the input voltage
E.oC1
Over current
during
acceleration
●Acceleration time is too
short
●To start rotating motor
●V/F setting not correct or
torque boost setting too big
●Solar drive capacitor is too
small
●Prolong acceleration time
●Restart motor when it on still, or set
F1.00 for 1 or 2
●Reset V/f curve or torque boost
setting
E.oC2
Over current
during
deceleration
●The output circuit is
grounded or short circuited.
●Motor auto-tuning is not
performed
●The acceleration time is too
short
●Manual torque boost or V/F
curve is not appropriate
●The voltage is too low
●Eliminate external faults
●Perform the motor auto tuning
●Increase the acceleration time
●Adjust the manual torque boost or
V/F curve
●Adjust the voltage to
normal range
●Select rotational speed tracking
restart or start the motor after it stops