External Trip - Hitachi L100 Instruction Manual

4–12
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. When the
switch between the set terminals [EXT] and [P24] is turned on, the equipment enters the
trip state. Even when the switch to [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.
Option
Code
12
Valid for inputs:
Required settings:
Notes:
•
If the USP (Unattended Start Protection) feature is
in use, the inverter will not automatically restart
after cancelling the EXT trip event. In that case, it
must receive another Run command (off-to-on
transition).
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Technologies Inc.
[EXT] terminal
Motor revolution speed
[RS] terminal
Alarm output terminal
RUN command [FW, RV]
Terminal
Function Name
Symbol
EXT External Trip
C01, C02, C03, C04, C05
(none)
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:
L 5
See I/O specs on page 4–5.
time
EXT FW
P24
4 3 2 1