Continuing Operation
6-
35
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 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.
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 IUV (main circuit undervoltage) will be detected.
Related Constants
* The factory setting depends on the Inverter capacity.
Constant
Number
Name
Description
Setting
Range
Factory
Setting
Change
during
Operation
Control
Methods
MEMOBUS
Register
Open-
loop
Vector
Flux
Vector
Display
L2-01
Momentary power loss
detection
0: Disabled [main circuit
undervoltage (IUV)
detection]
1: Enabled [Restarted when
the power returns within the
time for L2-02. When L2-
02 is exceeded, main circuit
undervoltage (IUV) is
detected.]
A backup of the control power
supply is necessary for tempo-
rary power loss protection.
0 or 1
0
No
A
A
4F0H
PwrL Selection
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.
0.0 to
10.0
2.0 s
No
A
A
4F1H
PwrL Ridethru t
L2-03
Min. baseblock 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
2.0 s
*
No
A
A
4F2H
PwrL Baseblock t
L2-04
Voltage recovery time
Sets the time required to return
the Inverter output voltage to
normal voltage at the comple-
tion of a speed search, in units
of one second.
Sets the time required to
recover from 0 V to the maxi-
mum voltage.
0.0 to
10.0
1.5 s
*
No
A
A
4F3H
PwrL V/F Ramp t
