Hitachi SJ7002 Series Instruction Manual page 183

External Trip
When the terminal [EXT] transitions OFF-to-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
12
Opt. Code 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
[EXT]
Symbol
clear the error, returning the inverter to the Stop Mode.
Valid for
In the graph below, the [EXT] input turns ON during normal Run Mode operation. The inverter
[1] to [8]
Inputs
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
Required
(none)
OFF, the motor begins rotation since the Run command is already active.
Settings
Default
Requires
config.
terminal
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 either another Run
command (OFF-to-ON transition), a keypad Reset command, or an [RS] intelligent terminal
input signal.
Unattended Start
If the Run command is already present when power is turned ON, the inverter starts running
immediately after powerup. The Unattended Start Protection (USP) function prevents that
Protection
automatic startup. If the [USP] input is active, the inverter will not run without outside interven-
tion. In this case, there are two ways to reset an alarm and resume running:
13
Opt. Code
1. Turn the Run command OFF, or
[USP]
Symbol
2. Perform a reset operation by the terminal [RS] input or the keypad Stop/reset key
Valid for
[1] to [8]
Inputs
The three examples below show how the USP function works in the scenarios described at the
bottom of the diagram. The error code E13 indicates the USP trip state and corresponds to the
Required
Alarm signal in the diagram.
(none)
Settings
Default
[6]*
terminal
* Default for -FU2 models
only; others require input
configuration
When USP is ON after powerup, the
alarm (E13) will clear when the Run
command (FW or RV) turns OFF.
Note the following;
• Note that when a USP error occurs and it is canceled by a reset from the [RS] terminal input
• Even when the trip state is canceled by turning the terminal [RS] ON and OFF after an
[EXT]
Motor revolution speed
[RS]
Alarm output terminal
[FW, RV]
Example 1
Power
supply
[FW]
[USP]
[RS]
Alarm
Output
frequency
or keypad, the inverter restarts immediately.
under- voltage trip E09 occurs, the USP function will be performed.
free run
Example 2
If the alarm is cleared If the Run command is
during Run command, already OFF at powerup,
the inverter output the inverter output starts
restarts automatically. normally.
4–21
SJ700 Inverter
2
t
Example 3
t