64
Phenomena
Conditions
Possible reasons of fault
Actions
running
Reference frequency is 0
Check the reference frequency
Skip frequency
Check skip frequency
Positive logic, close
loop feedback>reference
frequency, Negative
logic, close loop
feedback<reference
frequency
Check the close loop setting and
feedback
Frequency adjustment is
set at 0
Check F9.05
Restart low voltage
compensation function
enabled, and low supply
voltage
Check the configuration of restart
and the input voltage
Inverter
does not
work
The inverter
does not work
after pressing
“RUN” key,
and the
operating
indicator is
distinguished.
Terminal of coast to
stop is valid
Check the terminal of coast to
stop
Terminal of prohibit
running is valid
Check this terminal
Terminal of external
stop is valid
Check this terminal
Fixed length stop
Check the setting of fixed
length or clear the actual
length
The operation control
terminal is not closed
under 3-wire control
mode
Reset and close this terminal
Faulty alarm
Clear the fault
Host virtual terminal
set incorrectly
Cancel this function or reset
F9.15
FWD/REV logic of
input terminal is
incorrectly
Check the set of F9.15
Dispay
LU upon
power on
Thyristor or
contactor is
disconnected
and the
inverter’s load
is too large
As the thyristor
orcontactor is
closed, the bus
voltage will reduce
when the inverter’s
load is large, so that
“LU” is displayed
instead of “F.Con”
Operate the inverter after the
thyristor or contactor are
completely closed