6-38
Automatically Restart
This section explains functions for continuing or automatically restarting Inverter operation after a
momentary power loss.
Restarting Automatically After Momentary Power Loss
After a momentary power loss, the Inverter can be restarted automatically to continue motor operation.
To restart the Inverter after power is recovered, set L2-01 to 1 or 2.
If L2-01 is set to 1, the inverter will restart, when power is recovered within the time set in L2-02. If the power
loss time exceeds the time set in L2-02, an UV1 alarm (DC bus undervoltage) will be detected.
If L2-01 is set to 2, the inverter will restart, when the main power supply is recovered as long as the control
power supply (i.e., power supply to the control circuit) is maintained. Consequently, alarm UV1 (DC bus und-
ervoltage) will not be detected.
Related Constants
* 1. Factory settings depend on Inverter capacity. (The values shown are for a 200 V Class Inverter for 0.4 kW.)
* 2. These values are for a 200 V Class Inverter. For a 400 V Class Inverter, double the values.
Setting Precautions
• Error output signals are not output during momentary power loss recovery.
• To continue Inverter operation after power has been restored, make settings so that RUN commands from
the control main circuit terminal are stored even while power is suspended.
• If the momentary power loss operation selection is set to 0 (Disabled), an alarm UV1 (main circuit under-
voltage) will be detected when the momentary power loss exceeds 15 ms during operation.
Con-
stant
Number
Name Description
Setting
Range
Factory
Setting
Change
during
Opera-
tion
Access
Level
L2-01 Momentary power loss detection
0: Disabled (DC bus undervoltage (UV) detection)
1: Enabled (Restarted when the power returns within the
time for L2-02. When L2-02 is exceeded, DC bus und-
ervoltage detection.)
2: Enabled while CPU is operating. (Restarts when power
returns during control operations. Does not detect DC
bus undervoltage.)
0 to 2 0 No A
L2-02
Momentary power loss ridethru
time
Ridethrough time, when momentary power loss selection
(L2-01) is set to 1.
0 to 2.0
0.1 s
*1
No A
L2-03 Min. baseblock (BB) time
Sets the Inverter’s minimum baseblock time; when the
Inverter is restarted after power loss ridethrough.
Sets the time to approximately 0.7 times of the motor time
constant.
When an overcurrent or overvoltage occurs when starting
a speed search or DC injection braking, increase the set
values.
0.1 to 5.0 0.1 s No A
L2-04 Voltage recovery time
Sets the time required to return the Inverter output voltage
from 0 V to normal voltage at the completion of a speed
search.
0.0 to
5.0
0.3 s
*1
No A
L2-05
Undervoltage (UV) detection
level
Sets the main circuit undervoltage (UV) detection level
(main circuit DC voltage).
Usually changing this setting is not necessary.
150 to
210
*2
190 V
*2
No A
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