Hitachi L300P - Manual (Page 150)

Using Intelligent Input Terminals
Oper
ations
a
nd Moni
tor
ing
4–20
External Trip When the terminal [EXT] is turned ON, the inverter enters the trip state, indicates error code
E12, and stops the output. This is a general purpose interrupt type feature, and the meaning of
the error depends on what you connect to the [EXT] terminal. Even if [EXT] is turned OFF, the
inverter remains in the trip state. You must reset the inverter or cycle power to clear the error,
returning the inverter to the Stop Mode.
In the graph below, the [EXT] input turns ON during normal Run Mode operation. The inverter
lets the motor free-run to a stop, and the alarm output turns ON immediately. When the
operator initiates a Reset command, the alarm and error are cleared. When the Reset is turned
OFF, the motor begins rotation since the Run command is already active.
Opt.
Code
Symbol Function Name
Input
State
Description
12 EXT External Trip ON When assigned input transitions OFF to
ON, inverter latches trip event and
displays E12
OFF No trip event for ON to OFF, any recorded
trip events remain in history until Reset
Valid for
inputs: C001, C002, C003, C004,
C005
Required
settings: (none)
Notes:
• If the USP (Unattended Start Protection)
feature is in use, the inverter will not automat-
ically restart after cancelling the EXT trip
event. In that case, it must receive either
another Run command (OFF-to-ON transi-
tion), a keypad Reset command, or an [RS]
intelligent terminal input signal.
free run
[EXT]
[FW, RV]
[RS]
Motor revolution speed
Alarm output terminal
t
5 3 1 4 2 FW TH
PLC P24 CM1
See I/O specs on page 4–8 .
EXT
Example (requires input configuration—
see page
3–43 ):