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Continuing Operation
This section explains functions for continuing or automatically restarting Inverter operation even if an
error occurs.
K K K K
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 is restored, set L2-01 to 1 or 2.
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 undervolt-
age) will not be detected.
nRelated Parameters
Param-
eter
Num-
ber
Momentary power loss
detection
L2-01
PwrL Selection
Momentary power loss
ridethru time
L2-02
PwrL Ridethru t
Min. baseblock (BB) time
L2-03
PwrL Baseblock t
Voltage recovery time
L2-04
PwrL V/F Ramp t
Undervoltage (UV) detec-
tion level
L2-05
PUV Det Level
* 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.
nSetting 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.
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6
Name
LCD Display
0: Disabled (main circuit undervoltage (UV)
detection)
1: Enabled (Restarted when the power returns
within the time for L2-02. When L2-02 is
exceeded, main circuit undervoltage detec-
tion.)
2: Enabled while CPU is operating. (Restarts
when power returns during control operations.
Does not detect main circuit undervoltage.)
Ridethrough time, when momentary power loss
selection (L2-01) is set to 1, in units of seconds.
Set the Inverter's minimum baseblock 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 overvoltage occurs when
starting a speed search or DC injection braking,
increase the set values.
Set the time required to return the Inverter output
voltage to normal voltage at the completion of a
speed search, in units of one second.
Set the time required to recover from 0 V to the
maximum voltage.
Sets the main circuit undervoltage (UV) detection
level (main circuit DC voltage) in V units.
Usually setting is not necessary.
Insert an AC reactor in the Inverter input side to
lower the main circuit undervoltage detection
level.
Setting
Description
Range
0 to 2
0 to 2.0
0.1 to 5.0
0.0 to
5.0
150 to
210
Control Methods
Change
Factory
during
Setting
Opera-
V/f
tion
0
No
A
0.1 s
No
A
*1
0.1 s
No
A
*1
*1
No
A
0.3 s
190 V
No
A
*2
*2
Open
V/f
Loop
with
Vec-
PG
tor
A
A
A
A
A
A
A
A
A
A
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Troubleshooting
