Parameter List
10
10.11 L: Protection Functions
YASKAWA ELECTRIC SIEP C710617 05F YASKAWA AC Drive GA700 Technical Manual 569
◆ L2: Power Loss Ride Through
No.
(Hex.)
Name Description
Default
(Range)
Ref.
L2-01
(0485)
Power Loss Ride
Through Select
Sets the drive operation after a momentary power loss.
0 : Disabled
1 : Enabled for L2-02 Time
2 : Enabled while CPU Power Active
3 : Kinetic Energy Backup: L2-02
4 : Kinetic Energy Backup: CPU Power
5 : Kinetic Energy Backup: DecelStop
0
(0 - 5)
951
L2-02
(0486)
Power Loss Ride
Through Time
Sets the maximum time that the drive will wait until trying to restart
after power loss.
Determined by o2-
04 and C6-01
(0.0 - 25.5 s)
952
L2-03
(0487)
Minimum
Baseblock Time
Sets the minimum baseblock time when the drive restores power
after a momentary power loss.
Determined by o2-
04 and C6-01
(0.1 - 5.0 s)
952
L2-04
(0488)
Powerloss V/f
Recovery Ramp
Time
Sets the time for the drive output voltage to go back to correct
voltage after completing speed searches.
Determined by o2-
04 and C6-01
(0.0 - 5.0 s)
952
L2-05
(0489)
Undervoltage
Detection Lvl
(Uv1)
Sets the voltage at which a Uv1 [DC Bus Undervoltage] fault is
triggered or at which the KEB function is activated. Usually it is not
necessary to change this setting.
NOTICE: Damage to Equipment. Install an AC reactor option
on the input side of the power supply when setting this
parameter lower than the default value. Failure to obey will
cause damage to drive circuitry.
Determined by E1-
01
(Determined by
E1-01)
952
L2-06
(048A)
Expert
Kinetic Energy
Backup Decel
Time
Sets the deceleration time during KEB operation used to decrease
the maximum output frequency to 0.
Note:
When L2-29 = 1, 2 , 3 [Kinetic Energy Backup Method = Single
Drive KEB Ride-Thru 2, System KEB Ride-Thru 1, System KEB
Ride-Thru 2] and you do KEB Auto-Tuning, the drive will
automatically set this value.
0.0 s
(0.0 to 6000.0 s)
953
L2-07
(048B)
Expert
Kinetic Energy
Backup Accel
Time
Sets the acceleration time to return the frequency to the frequency
reference before a power loss after canceling KEB operation.
0.0 s
(0.0 to 6000.0 s)
953
L2-08
(048C)
Expert
Frequency Gain at
KEB Start
Sets the quantity of output frequency reduction used when KEB
operation starts as a percentage of the motor rated slip before
starting KEB operation.
100%
(0 - 300%)
953
L2-09
(048D)
Expert
KEB Minimum
Frequency Level
Sets the quantity of output frequency reduction used when KEB
operation starts as a percentage of the motor rated slip.
20%
(0 - 100%)
954
L2-10
(048E)
Expert
Minimum KEB
Time
Sets the minimum length of time to operate the KEB after the drive
detects a momentary power loss.
50 ms
(0 - 25500 ms)
954
L2-11
(0461)
Expert
KEB DC Bus
Voltage Setpoint
Sets the target value that controls the DC bus voltage to a constant
level in Single Drive KEB Ride-Thru 2. Sets the DC bus voltage
level that completes the KEB operation for all other KEB methods.
Determined by E1-
01
(Determined by
E1-01)
954
L2-29
(0475)
Expert
Kinetic Energy
Backup Method
Sets the KEB function operation mode.
0 : Single Drive KEB Ride-Thru 1
1 : Single Drive KEB Ride-Thru 2
2 : System KEB Ride-Thru 1
3 : System KEB Ride-Thru 2
0
(0 - 3)
954
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