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Chapter 5 Fault Diagnoses and Processing
This chapter explains the display constant and process of the inverter fault, alarm and operation
fault. It also simply explains the bad situation caused by inverter or motor fault and how to solve it.
For the adjustment guide in trial run, please refer to this chapter too.
5.1 Fault types
Type
Equipment fault
External fault
5.2 Fault information and details
Keyboard
Fault
display
code
L.U.1
E.LU2
E.oU1
Inverter action while fault happens
While inverter detect fault, the state likes this:
Keyboard display character showing fault content.
●
Inverter stops output. Motor free slide stops.
●
●
While function F2.29/F2.30 is set as 3(output fault), Y1/Y2 terminals
output valid open-collector digital output.
While function F2.31 is 3(fault output), TA-TC terminals output open
●
passive digital output.
While there is fault as OL, OC, SC, OV, UL2, if FA.22 is not 0, the inverter
●
will restart automatically after FA.23 setting time.
In certain application occasions, external related equipments fault signals
are considered in the inverter control system as usage of monitoring,
protection or switch control. At this time, if one multi function terminal is
defined as "external fault", the inverter stops output alarm signal.
Fault type
Power supply is too
●
Too low
low
while stop
Voltage detection
●
circuit is abnormal
● Power supply is too
low
● Power capacitance is
Too low
too small, or there is
voltage in
big impact current in
run
the power grid.
● Inner DC main
contactor is not
closed.
Acc
● Power voltage
over-voltag
fluctuation over limit.
e
● Start running motor.
AC80T Tower Crane Purpose VFD Manual
Possible causes
35
Treatment
● Check input power,
eliminate fault.
● Seek support from factory.
● Check input power,
eliminate fault.
● Improve power-supply
system.
● Seek support from factory.
● Detect power voltage and
eliminate fault.
● Restart motor until it totally
stop.Set F1.00 as 1or 2.
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