In the three-wire control
mode, the three-wire
operation control function
terminal Is not closed
Set and close the three-wire system operation
control terminal
Fault alarm
troubleshooting
Phenomenon condition Possible Causes
Countermeasures
Inverter stops
unexpectedly
during
operation
If no stop
command is
given, the
inverter will stop
automatically,
and the running
indicator light
will be off.
Fault alarm
Find the cause of the fault and reset the fault
There was a power outage Check power supply
run command channel switch
Check the operation and run command channel
related function code settings
Positive and negative logic
changes of control terminals
Check whether the setting of F5.08 meets the
requirements
If no stop
command is
given , the motor
stops
automatically,
the inverter r
unning indicator
light is on, and it
runs at zero
frequency
Fault automatic reset
Check the fault automatic reset setting and the
cause of the fault
External Interrupt
Check external interrupt settings and fault sources
Set frequency to 0 Check the set frequency
The starting frequency is
greater than the set frequency
Check starting frequency
Jump frequency setting problem
Check skip frequency settings
Enable the "forbidden forward
running" terminal during
forward running
Check terminal function settings
Enable the "reverse running
prohibited" terminal during
reverse running
Check terminal function settings
Inverter does
not run
Press the run key,
the inverter will
not run, and the
run indicator
light will be off.
Free stop function terminal is
valid
Check free stop terminal
The terminal for prohibiting
the operation of the inverter
is valid
Check the inverter prohibition terminal
The external stop function
terminal is valid
Check the external stop function terminal
Improper setting of positive
and negative logic of input
terminal
Check F5.08 settings
P.oFF is
reported
immediately
when the
Inverter is
powered on
The thyristor or
contactor is
disconnected and
the frequency
converter is
heavily loaded
Because the thyristor or
contactor is not closed, the
DC bus voltage of the main
circuit will drop when the
inverter is running with a large
load, and the inverter will first
display P.oFF and no longer
display E.SHt fault
Wait for the thyristor or contactor to be fully closed
before running the drive
10.8 Fault diagnosis process
ćć The fault diagnosis process is shown in Figure 10.2:
081
NVF2G-S Series Inverter User's Guide
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