External Trip - Hitachi L300P Series Instruction Manual

4–20
Using Intelligent Input Terminals

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.
[EXT]
Motor revolution speed
[RS]
Alarm output terminal
[FW, RV]
Opt.
Symbol Function Name
Code
12 EXT External Trip
C001, C002, C003, C004,
Valid for
C005
inputs:
(none)
Required
settings:
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
Input
Description
State
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
Example: (Requires input configuration—
see page 3–43. Jumper position shown is
for –xFU/-xFR models; for –xFE models,
see page 4–11.)
TH FW
5
P24 PLC CM1
See I/O specs on page 4–8.
t
EXT
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