6-38
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
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 fault (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. Nevertheless, UV alarm is displayed.
îš„Related Parameters
îš„Setting Precautions
• Fault output signals are not output during momentary power loss recovery.
• To continue Inverter operation after power has been restored, ensure that the RUN command stays ON
during the power loss
• L2-04 sets an acceleration time for the output voltage (from 0 V to normal voltage). After the power sup-
ply has returned the output voltage will be increased to the set value using the time set in L2-04.
• L2-05 sets the level at which UV is detected.
Parameter
Number
Name
Setting
Range
Factory
Setting
Change
during
Operation
Access
Level
L2-01 Momentary power loss detection 0 to 2 0 No A
L2-02 Momentary power loss ridethru time 0 to 25.5
0.1 sec.
*1
*1. The factory setting depends on the Inverter capacity. The value for a 200 V class Inverter of 0.4kW is given.
No A
L2-03 Min. baseblock (BB) time 0.1 to 5.0
0.1 sec.
*1
No A
L2-04 Voltage recovery time
0.0 to
5.0
0.3 sec.
*1
No A
L2-05
Undervoltage (UV) detection level
150 to
210
*2
*2. Values for 200 V class Inverters are shown. For a 400 V class Inverter the values have to be doubled.
190 VDC
*2
No A
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