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L100 Inverter
Operations
and Monitoring
4–13
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. To
reset an alarm and restart running, turn the Run command off or perform a reset opera-
tion 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 forces outside intervention to reset
the alarm by turning off the Run command. Then the Run command can turn on again
and start the inverter output.
time
Inverter output frequency
Inverter power supply
[USP] terminal
Alarm output terminal
RUN command [FW, RV]
Run
command
E13
Alarm
cleared
Alarm
display
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:
C01, C02, C03, C04, C05
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:
FW
USP
See I/O specs on page 4–5.
P24
123L 45
Technologies Inc.
Toll Free: voice: 1-877-539-2542 fax: 1-800-539-2542 www.mgitech.com