Chapter 4 Fault Diagnosis And Solution - Veichi SI23 Manual

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
Fault code
Keypad
display
E.LU2
E.oU1
E.oU2
E.oU3
E.oU4
E.oC1
E.oC2

Chapter 4 Fault Diagnosis and Solution

Fault type
●Power voltage too low
Under voltage
●DC main contactor don't
at runs
close
●Power voltage fluctuation
Over voltage at
over limit
acceleration
●Too start rotating motor
●Deceleration time too small
Over voltage
●The driving load too heavy
during
●Power voltage fluctuation
deceleration
over limit
●The input voltage is too high
Overvoltage at
●An external force drives the
constant speed
motor during deceleration
Over voltage at
●Voltage fluctuate above limit
stop
●Acceleration time is too
short
Over current ●To start rotating motor
during ●V/F setting not correct or
acceleration torque boost setting too big
●Solar drive capacitor is too
small
●The output circuit is
grounded or short circuited.
●Motor auto-tuning is not
Over current performed
during ●The acceleration time is too
deceleration short
●Manual torque boost or V/F
curve is not appropriate
●The voltage is too low
Possibility reason
●Check input power to solve
●Ask support
●Check power grid
●Restart until motor is stop
completely, or set [F1.00] set for 1 or
2
●Prolong deceleration time
●Reduce the load, or select bigger
capacitor drive, or connect braking
unit
●Check input power
●Adjust the voltage to
normal range
●Cancel the external force or install
the braking resistor
●Check the input voltage
●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
●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
19
SI23 Solar Pump VFD Manual
Troubleshooting