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Chapter 4 Explanation of Functions
4.2.52 External trip (EXT) function
The external trip function allows you to make the inverter trip
according to the error (trip) signal generated by an external system.
C001 to C008: Terminal [1] to [8] functions
Related code
To use this function, assign function "12" (EXT) to one of the terminal [1] to [8] functions (C001 to C008).
When the EXT terminal is turned on, the inverter trips with error code "E12" displayed and stops the
output.
After the inverter trips with error code "E12" displayed, it will not be recovered from tripping, even when the
error signal from the external system is reset (i.e., the EXT terminal is turned off).
To recover the inverter from tripping, reset the inverter or turn the inverter power off and on.
Item Function code Data Description
Terminal [1] to [8] functions C001 to C008 12 EXT: External trip
Note: Do not turn on the EXT terminal after the inverter power is shut off. Otherwise, the error history may
not be stored correctly.
Operation commands
FW and RV
EXT terminal
Motor speed
RS terminal
Alarm output terminal
Free running
4.2.53 3-wire interface operation function (STA, STP, and F/R)
The 3-wire interface operation function allows you to use automatic-
reset contacts (e.g., pushbutton switches) to start and stop the inverter.
C001 to C008: Terminal [1] to [8] functions
Related code
Specify "01" (control circuit terminal block) for the run command source setting (A002).
Assign function "20" (STA), "21" (STP), and "22" (F/R) to three of the terminal [1] to [8] functions (C001 to
C008) to enable the control operations described below. Assigning the STP function to an intelligent input
terminal disables the functions of the FW and RV terminals.
The figure below shows the inverter outputs according to terminal operations.
Item Function code Data Description
20 STA: Starting the motor
21 STP: Stopping the motor
Terminal [1] to [8] functions C001 to C008
22
F/R: Switching the motor operation
direction
Output frequency
OFF
OFF
ON
ON
F/R
STP
STA
Forward
rotation
Reverse
rotation
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