elapses after the RUN command is turned OFF. Use this function when the load state causes the
output frequency to rise by anti-regenerative control and the motor does not stop.
7-8-3
Instantaneous Overcurrent Limitation
• This function is used to select whether to perform the current limitation process (a process where
the inverter output is momentarily turned OFF to suppress an increase in the current, and the output
frequency is operated) or overcurrent tripping when the output current of the inverter becomes equal
to or above the instantaneous overcurrent limitation level.
•
If the torque generated by the motor is temporarily reduced due to the current limitation process,
and a failure occurs for the use of the equipment or machinery, it is necessary to perform overcur-
rent tripping and use a mechanical brake.
•
During instantaneous current limitation operation, Inverter output limiting signal (05: IOL), (22: IOL2)
is output.
Parameter No. Function name Data
Default
data
Unit
H12
Instantaneous Overcurrent Limit-
ing Function Selection
0: Disable (Overcurrent tripping at
an instantaneous overcurrent limi-
tation level)
1: Enable (Instantaneous current
limitation operation is enabled)
1 -
E20, E21, E27
Output Terminal [DO1] Function
Selection, Output T
erminal [DO2]
Function Selection, Output Termi-
nal [ROA, ROB] Function Selec-
tion
5: IOL (Inverter output limiting)
22: IOL2 (Inverter output limiting
with delay)
-
-
7-8-4
External Trip (EXT)
Use this signal to have the inverter trip via an error signal generated by a peripheral system. To do so,
allocate “9: EXT (External trip)” to Input Terminal [DI1] Function Selection to Input Terminal [DI7] Func-
tion Selection (E01 to E05, E98, E99).
When the EXT terminal turns ON, the inverter trips with the alarm code 0H2 displayed and shuts off its
output.
Once the inverter trips and generates the external alarm (alarm code: OH2), the trip status will not be
reset even if the error signal from external equipment is reset (the EXT terminal is turned ON).
In this case, perform the reset operation or cycle the power supply to reset the trip. For details on a
reset operation, refer to 5-8 Reset
on page 5-49.
Parameter No. Function name Data
Default
data
Unit
E01 to E05,
E98, E99
Input Terminal [DI1] to [DI7] Func-
tion Selection
9: EXT (External trip)
- -
7 Other Functions
7-87
M1 Series Standard Type User's Manual (I669)
7-8 Functions Related to Protection, Warning and Various Output Signals
7
7-8-3 Instantaneous Overcurrent Limitation
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