Unattended Start Protection - Hitachi WJ200 Series Quick Reference Manual

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 [USP] 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
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.
Run command [FW,RV] 1
[USP] terminal 1
Alarm output terminal 1
Inverter output frequency
Inverter power supply 1
Option Terminal
Function Name
Code Symbol
13
USP Unattended Start
Protection
C001~C007
Valid for inputs:
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
E09
voltage protection 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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E 13
error code. This requires outside intervention to reset
0
0
0
0
0
Events: E13
State
ON
OFF
34
Alarm Run
cleared command
Description
On powerup, the inverter will not resume a Run
command (mostly used in the US)
On powerup, the inverter will resume a Run
command that was active before power loss
Example (default input configuration shown for
–FE and –FU models; –F models require input
configuration—see page
7 6 5 4 3
See I/O specs on page 4–6.
t
3–49):
USP
2 1 L PLC PCS P24