1) Input phase loss setting
On the premise that the R, S, T three-phase AC power supply of the inverter lacks any one phase, select
whether the inverter prompts to input a phase loss fault . When the inverter input phase loss protection is
selected for software detection, it is necessary to adapt the motor (same as the power level of the frequency
converter) with a load of more than 20% of the rated torque, and the input phase loss protection action can be
prompted.
2) Output phase loss setting
On the premise that the inverter runs with a motor, when any one of the U, V, W three-phase output of
the inverter is missing , select whether the inverter will prompt output phase loss fault .
8.9.4 Load Loss Protection
FE.17=1 The load-off protection is valid, and when the output current of the inverter is less than the load-
off detection level FE.18, and the duration is longer than the load-off detection time FE.19 , the inverter executes
the load-off protection action.
If you choose to continue to run when the load is off, the inverter will automatically resume to run at the
set frequency if the load recovers during the load off protection period.
function code
name
default value
Predetermined area
Parameter Description
FE.17
Load Loss Protection
Selection
0
0~ 1
0: invalid
1: valid
FE.18
Load drop detection
level
10.0%
(0.0~100.0)%
100 % is the rated current of
the motor
FE.19
Load drop detection time
1.0s
(0.0~60.0)s
8.9.5 Fault reset
Fault reset provides two reset methods: manual reset and automatic reset (limited by the number of
automatic resets).
1. Module failure, overcurrent failure, etc.: automatic reset is not allowed, only manual reset is allowed;
2. Undervoltage fault: it will be automatically reset when the bus voltage returns to normal, and it will not
be included in the fault automatic reset times;
3. Short-circuit fault to ground: It cannot be reset automatically or manually. It can only be reset after the
inverter is completely powered off and powered on again.
Notice
When automatic fault reset is adopted, if the inverter is in running state immediately before the fault
occurs, if the number of automatic resets has not been reached: the inverter will automatically reset
the fault, and the inverter will continue to run after automatic reset.
8.9.6 Selection of fault action protection
When the inverter fails, the action state after the fault can be determined by the fault protection action
selection function, which can be selected as: free stop after the fault, decelerate to stop after the fault, and
continue to run after the fault.
Units: motor overload E .OL1
0: Free parking
1: mode shutdown
2: keep running
Tens place: input phase loss E .SPI
(same as ones place)
Hundreds place: output phase loss E .SP0
(same as ones place)
Thousands place: external fault E .EF
(same as ones place)
function
code
name
default
value
Predetermined
area
Parameter Description
FE.38
Protection action
selection 1 at fault
0x0000
0x0000 ~0x2222
055
NVF2G-S Series Inverter User's Guide
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