AC70 VC CONTROL FREQUENCY INVERTER MANUAL
FAULT DIAGNOSES AND PROCESSING
50
Chapter 5: Fault Diagnoses and Processing
This chapter explains the display content and processing 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 this chapter too.
5.1 Fault Types
Type
Inverter action while fault happens
Equipment fault
While inverter detection fault, the state likes this:
●
Keyboard display character showing fault content.
●
Inverter stops output. Motor stops free slide.
●
While function F-31/F-32 is set as 1(fault output),Y1/Y2 terminals output valid open
collector digital output.
●
While function F-30 is 1(fault output), TA-TC terminals output open passive digital
output.
●
While there is fault as OL, OC, SC, OV, UL2, if [E-43] is not 0, the inverter will
automatically restart after E-44 setting time.
External fault
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 defied as “external fault”, the inverter
stops output alarm signal.
5.2 Fault Information and Details
Keyboard
display
Fault
code
Fault type
Possible causes
Treatment
L.U.1
Too low
voltage while
stop
●
Power supply is too low
●
Voltage detection circuit is
abnormal
●
Check input power,clear
fault.
●
Seek support from factory.
E.LU2
Too low
voltage in run
●
Power supply is too low
●
Power capacitance is too
small, or there is big impact
current in the power grid.
●
Inner DC main contactor is
not connect well
●
Check input power,clear
fault.
●
Improve power supply.
●
Seek support from factory.
E.oU1
Accel.
over-voltage
●
Power voltage fluctuation
over limit.
●
Start when motor is
running .
●
Detect power voltage and
clear fault.
●
Restart motor until it
completely stop.Set E-30 as
1or2.
E.oU2
Decel.
over-voltage
●
Deceleration time is too
short.
●
Load potential energy or
inertia is too large.
●
Power voltage fluctuation
over limit.
●
Prolong Deceleration time.
●
Reduce load inertia or
improve inverter capacitance or
add braking unit.
●
Detect power voltage and
clear fault.
E.oU3
Constant
speed
over-voltage
●
Power voltage fluctuation
over limit.
●
Detect power voltage and
clear fault.
●
Install input reactor.
