Parameter List
11
11.11 L: Protection Functions
YASKAWA SIEPC71061737D GA800 Drive Technical Reference 615
◆ 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 : Disable
1 : Enabled
2 : Enabled while CPU Power Active
3 : Kinetic Energy Backup: L2-02
4 : Kinetic Energy Backup: CPU Power
5 : Kinetic Energy Backup: DecelStop
Note:
When the CPU is inactive, b1-17 [Run Command at Power Up] sets operation at
power up.
0
(0 - 5)
970
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,
C6-01
(0.0 - 25.5 s)
971
L2-03
(0487)
Minimum Baseblock
Time
Sets the minimum time to continue the drive output block (baseblock) after a baseblock.
Determined by o2-04,
C6-01
(0.1 - 5.0 s)
971
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,
C6-01
(0.0 - 5.0 s)
972
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. When you set this parameter
to a value lower than the default, you must install an AC reactor
on the input side of the power supply. If you do not install an AC
reactor, it will cause damage to the drive circuitry.
Determined by o2-04 and
E1-01
(200 V Class: 150 - 210
V, 400 V Class: 300 - 420
V)
972
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, or 3 [Kinetic Energy Backup Method = Single Drive KEB Ride-
Thru 2, System KEB Ride-Thru 1, or System KEB Ride-Thru 2] and you do KEB Auto-
Tuning, the drive will automatically set this value.
0.0 s
(0.0 - 6000.0 s)
972
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 - 6000.0 s)
973
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%)
973
L2-09
(048D)
Expert
KEB Minimum
Frequency Level
Sets the quantity of output frequency reduction used as a percentage of E2-02 [Motor
Rated Slip] when KEB operation starts.
20%
(0 - 100%)
973
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)
973
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)
974
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)
974
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