*Example of the set frequency (E152 = 2)
Output frequency
(motor rotation speed)
Pull-in*
Overvoltage/overcurrent detection
Restart from
starting frequency
H05
Auto search
Auto-resetting
“TR
Y”
7-4-4
Unattended Start Protection (USP Terminal)
• Use this function to have the inverter trip if the power supply is turned ON with the RUN command
ON in the inverter.
• When the RUN command is ON and multifunction input “USP” is ON when the power is ON, a run
operation error (alarm code: Er6, sub code: 30) is generated
•
When the Er6 alarm is reset with the RUN command still ON, operation is started regardless of the
ON/OFF setting of “USP.” (Example 1)
• If the RUN command turns ON after the power supply is turned ON, the inverter operates normally.
(Example 2)
• Power recovery restart prevention based on USP input is enabled only for a RUN command from
the terminal block.
Parameter No. Function name Data
Default da-
ta
Unit
E01 to E05, E98,
E99
Input Terminal [DI1] to [DI7]
Function Selection
186: USP (Unattended start protec-
tion)
- -
The operation of the power recovery restart prevention function is shown below.
(Example 1) Power ON with RUN command ON
(Reset with Reset (RS))
(Example 2) RUN command after power ON (Nor-
mal operation)
ON
O
N
Power supply
FW input
(Forward)
USP
input
RS input
(Reset)
AL output
(Alarm signal)
Output frequency
ONOFF
O
N
OFF
Power supply
FW input
(Forward)
USP
input
RS input
(Reset)
AL output
(Alarm signal)
Output frequency
7 Other Functions
7-59
M1 Series Standard Type User's Manual (I669)
7-4 Restart Functions
7
7-4-4 Unattended Start Protection (USP Terminal)
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