Unattended Start Protection - Hitachi L300P Series Instruction Manual

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, so that the inverter will not run without outside intervention. When USP is
active, there are two ways to reset an alarm and resume running:
1. Turn the Run command OFF, or
2. Perform a reset operation by the terminal [RS] input or the keypad Stop/reset key
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
Alarm signal in the diagram.
When USP is ON after powerup, the
alarm (E13) will clear when the Run
command (FW or RV) turns OFF.
Opt.
Code
Valid for inputs:
Required
settings:
Notes:
• Note that when a USP error occurs and it is
• Even when the trip state is canceled by turning
• When the Run command is active immediately
Example 1
Power
supply
[FW]
[USP]
[RS]
Alarm
Output
frequency
Symbol Function Name
13 USP Unattended Start
Protection
C001, C002, C003, C004,
C005
(none)
canceled by a reset from the [RS] terminal
input or keypad, the inverter restarts immedi-
ately.
the terminal [RS] ON and OFF after an under-
voltage trip E09 occurs, the USP function will
be performed.
after the power is turned ON, a USP error will
occur. When this function is used, wait for at
least three (3) seconds after powerup before
applying a Run command.
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.
Input
Description
State
ON At powerup, the inverter will not resume a
Run command
OFF At powerup, the inverter will resume a
Run command that was active before
power loss
Example: (Default input configuration
shown for -FU2 models; -FE and -F mod-
els require input configuration—
see page 3–43. Jumper position shown is
for –xFU/-xFR models; for –xFE models,
see page 4–11.)
TH FW
P24 PLC CM1
See I/O specs on page 4–8.
4–21
L300P Inverter
Example 3
t
USP
5 4 3 2 1