6
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Continuing Operation
This section explains functions for continuing or automatically restarting Inverter operation even if an
error occurs.
Restarting Automatically After Power Is Restored
Even if a temporary power loss occurs, you can restart the Inverter automatically after power is restored to
continue motor operation.
To restart the Inverter after power is restored, set L2-01 to 1 or 2.
If L2-01 is set to 1, when power is restored within the time set in L2-02, the Inverter will restart. If the time set
in L2-02 is exceeded, alarm UV1 (main circuit undervoltage) will be detected.
If L2-01 is set to 2, when the main power supply is restored while the control power supply (i.e., power supply
to the control panel) is backed up, the Inverter will restart. Consequently, alarm UV1 (main circuit undervolt-
age) will not be detected.
Related Constants
Con-
stant
Number
Name
Description
Setting
Range
Factory
Setting
Change
during
Opera-
tion
Control Methods
MEMO
BUS
Regis-
ter
V/f
V/f
with
PG
Open
Loop
Vec-
tor
Flux
Vec-
tor
L2-01
Momentary
power loss
detection
0: Disabled [main circuit
undervoltage (UV1)
detection]
1: Enabled [Restarted when the
power returns within the
time for L2-02. When L2-02
is exceeded, main circuit
undervoltage (UV1)
detection.]
2: Enabled while CPU is
operating. [Restarts when
power returns during control
operations. Does not detect
main circuit undervoltage
(UV1).]
0 to 2
0
No
A
A
A
A
485H
L2-02
Momentary
power loss
ridethru time
Ridethrough time, when
Momentary Power Loss Selec-
tion (L2-01) is set to 1, in units
of seconds.
0 to 25.5
0.1 s
*1
No
A
A
A
A
486H
L2-03
Min. base-
block time
Sets the Inverter's minimum
baseblock time in units of one
second, when the Inverter is
restarted after power loss ride-
through.
Sets the time to approximately
0.7 times the motor secondary
circuit time constant.
When an overcurrent or over-
voltage occurs when starting a
speed search or DC injection
braking, increase the set values.
0.1 to
5.0
0.2 s
*1
No
A
A
A
A
487H