Unattended Start Protection - Hitachi L100 Instruction Manual

Unattended Start Protection

Option
Code
13
Valid for inputs:
Required settings:
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.
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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.
RUN command [FW, RV]
[USP] terminal
Alarm output terminal
Inverter output frequency
Inverter power supply
Terminal
Function Name
Symbol
USP Unattended Start
Protection
C01, C02, C03, C04, C05
(none)
Alarm
Alarm
E13
display
cleared
Input
State
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
Example:
See I/O specs on page 4–5.
L100 Inverter
time
Run
command
Description
USP FW
P24
L 5 4 3 2 1
4–13