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L2002 Inverter
Operations
and Monitoring
4–21
Unattended Start Protection
If the Run command is already set when power is turned ON, the inverter starts running
immediately after powerup. The Unattended Start Protection (USP) function prevents
that automatic startup, so that the inverter will not run without outside intervention.
When USP is active and you need to reset an alarm and resume running, either turn the
Run command OFF, or perform a reset operation by the terminal [RS] input or the
keypad Stop/reset key.
In the figure below, the [UPS] feature is enabled. When the inverter power turns ON, the
motor does not start, even though the Run command is already active. Instead, it enters
the USP trip state, and displays E13 error code. This requires outside intervention to
reset the alarm by turning OFF the Run command per this example (or applying a reset).
Then the Run command can turn ON again and start the inverter output.
Inverter output frequency
Inverter power supply
[USP] terminal
Alarm output terminal
RUN command [FW, RV]
Run
command
Alarm
cleared
Alarm
display
E13
t
1
0
1
0
1
0
1
0
1
0
Events:
Option
Code
Terminal
Symbol
Function Name
Input
State
Description
13 USP Unattended Start
Protection
ON On powerup, the inverter will not resume a Run
command (mostly used in the US)
OFF On powerup, the inverter will resume a Run
command that was active before power loss
Valid for inputs:
C001, C002, C003, C004,
C005
Required settings:
(none)
Notes:
•
Note that when a USP error occurs and it is
canceled by a reset from a [RS] terminal input, the
inverter restarts running immediately.
• Even when the trip state is canceled by turning the
terminal [RS] ON and OFF after an under voltage
protection E09 occurs, the USP function will be
performed.
• When the running command is active immediately
after the power is turned ON, a USP error will
occur. When this function is used, wait for at least
three (3) seconds after the powerup to generate a
Run command.
Example (default input configuration shown for
–FU models; –FE and –FR models require input
configuration—see page 3–47
):
See I/O specs on page 4–6
.
USP
12345L
PCS