NVF5 Series User Manual Chapter 7 Troubleshooting
zero speed, and
the running
indicator light
off
automatically
reset” setting and fault
cause
External interrupt
Check external interrupt
settings and fault source
0 Frequency Setting
Check frequency setting
Start frequency is higher
than the setting frequency
Check start frequency
Skip frequency setting
problem
Check skip frequency
setting
Enable“Forward Running
Prohibit”when forward
running mode
Check I/O parameter setting
Enable“Reverse Running
Prohibit”when reverse
running mode
Check I/O parameter setting
Inverter Run
Prohibit
Inverter can not
run when
press run key,
and the
running
indicator light
is off
Coast to stop terminal
effective
Check coast stop terminal
Run Prohibit terminal
effective
Check “run Prohibit”
terminal
External Stop terminal
effective
Check external Stop
terminal
Three Wire Mode,Run is
not activated
Set three wire mode run
terminal
Fault or Alarm
Trouble shooting
Input terminal logic
setting fault
Check Parameter F5.06
Fault P.oFF
appears when
inverter power
on
Thyristor or
Contactor
Disconnects
and the
Inverter load is
large
Due to the thyristor or
contactor is not closed,
DC bus voltage
will be reduced when the
inverter is running with a
large load, the inverter
will display P.oFF fault,
but no longer display
E.SHt fault
Run the inverter after
thyristor or contactor is fully
closed
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