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Automatic Restart
This section explains functions for continuing or automatically restarting inverter operation after a momentary
power loss.
îš‹ Restarting Automatically After Momentary Power Loss
If a temporary power loss occurs, the inverter can be restarted automatically to continue motor operation.
To restart the Inverter after the power has returned, set L2-01 to 1 or 2.
If L2-01 is set to 1, the inverter will restart as long as the 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.
îš„Related Parameters
îš„Setting Precautions
• Fault output signals are not output during momentary power loss recovery.
• To continue Inverter operation after the power has been restored, make the settings so that RUN com-
mands 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.
Parameter
No.
Name
Factory
Setting
Change
during
Opera-
tion
Control Methods
V/f
V/f with
PG
Open
Loop
Vector
Closed
Loop
Vector
L2-01Momentary power loss detection 0 No AAAA
L2-02 Momentary power loss ride through time
0.1 s
* 1
* 1. The factory setting depends on the Inverter capacity (the value shown is for a 200 V class Inverter with 0.4 kW)
No AAAA
L2-03 Min. baseblock (BB) time 0.1 s No AAAA
L2-04 Voltage recovery time
0.3 s
*1
No AAAA
L2-05 Undervoltage (UV) detection level
190 V
* 2
* 2. These values are for a 200 V Class Inverter. For a 400 V Class Inverter the values are double.
No AAAA
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