Continuing Operation
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63
Continuing Operation
This section explains functions for continuing or automatically restarting Inverter operation using speed
search even if an error occurs.
Restarting Automatically After Power Is Restored
Even if a temporary power loss occurs, you can perform estimated/current detection speed search using the
speed search function (b3-01) and restart the Inverter automatically after power is restored to continue motor
operation. To restart the Inverter after power has been restored, set L2-01 to 1 or 2. Make settings of L2-01 to
L2-05 and b3-01 for related details of restarting.
•
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 undervoltage) 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
Display
V/f
V/f
with
PG
Open
Loop
Vector
1
Flux
Vec-
tor
Open
Loop
Vector
2
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) is
detected.]
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
A
485H
PwrL Selection
L2-02
Momentary
power loss ride-
thru time
Ridethrough time, when Momen-
tary Power Loss Selection (L2-
01) is set to 1, in units of seconds.
0 to
25.5
0.1 s
*1
No
A
A
A
A
A
486H
PwrL Ridethru t
L2-03
Min. baseblock
time
Sets the Inverter's minimum base-
block time in units of one second,
when the Inverter is restarted after
power loss ridethrough.
Sets the time to approximately 0.7
times the motor secondary circuit
time constant.
When an overcurrent or overvolt-
age 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
A
487H
PwrL Base-
block t
