User Constant Tables
5-
57
Power Loss Ridethrough: L2
User constants for power loss ridethroughs are shown in the following table.
Con-
stant
Number
Name
Description
Setting
Range
Factory
Setting
Change
during
Opera-
tion
Control Methods
MEMO
BUS
Regis-
ter
Page
V/f
V/f
with
PG
Open
Loop
Vec-
tor
Flux
Vec-
tor
L2-01
Momentary
power loss
detection
0: Disabled [main circuit
undervoltage (UV1)
detection]
1: Enabled [Restarted when
the power returns within
the time for L2-02. When
L2-02 is exceeded, main
circuit undervoltage
(UV1) is detected.]
2: Enabled while CPU is
operating. [Restarts when
power returns during
control operations. Does
not detect main circuit
undervoltage. (UV1)]
0 to 2
0
No
A
A
A
A
485H 6-66
L2-02
Momentary
power loss
ridethru
time
Ridethrough time, when
Momentary Power Loss
Selection (L2-01) is set to 1,
in units of seconds.
0 to
25.5
0.1 s
*1
No
A
A
A
A
486H 6-66
L2-03
Min. base-
block time
Sets the Inverter's minimum
baseblock time in units of
one second, when the
Inverter is restarted after
power loss ridethrough.
Sets the time to approxi-
mately 0.7 times the motor
secondary circuit time con-
stant.
When an overcurrent or
overvoltage occurs when
starting a speed search or DC
injection braking, increase
the set values.
0.1 to
5.0
0.2 s
*1
No
A
A
A
A
487H
6-66
6-69
L2-04
Voltage
recovery
time
Sets the time required to
return the Inverter output
voltage to normal voltage at
the completion of a speed
search, in units of one sec-
ond.
Sets the time required to
recover from 0 V to the max-
imum voltage.
0.0 to
5.0
0.3 s
*1
No
A
A
A
A
488H
6-67
6-69
L2-05
Undervolt-
age detec-
tion level
Sets the main circuit under-
voltage (UV) detection level
(main circuit DC voltage) in
V units.
Usually setting is not neces-
sary.
Insert an AC reactor in the
Inverter input side to lower
the main circuit undervolt-
age detection level.
150 to
210
*2
190 V
*2
No
A
A
A
A
489H 6-67
