11.11 L: Protection Functions
420 YASKAWA SIEPC71061753C GA500 Technical Manual
◆ 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)
702
L2-02
(0486)
Power Loss Ride
Through Time
Sets the length of time that the drive will wait before it tries to restart if the DC bus
voltage is less than L2-05 [Undervoltage Detection Lvl (Uv1)] after a momentary power
loss.
Determined by o2-04,
C6-01
(0.0 - 25.5 s)
703
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)
704
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)
704
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)
704
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)
704
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)
705
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%)
705
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%)
705
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)
705
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)
706
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)
706
L2-30
(045E)
Expert
KEB Zero Speed
Operation
Sets the operation when the output frequency decreases below the zero level (DC
braking injection starting frequency) during KEB deceleration when L2-01 = 3 to 5
[Power Loss Ride Through Select = Kinetic Energy Backup: L2-02, Kinetic Energy
Backup: CPU Power, or Kinetic Energy Backup: DecelStop].
0 : Baseblock
1 : DC/SC Braking
0
(0, 1)
707
L2-31
(045D)
Expert
KEB Start Voltage Offset
Level
Sets the KEB start voltage offset.
Determined by A1-02
(200 V Class: 0 - 100
V,400 V Class: 0 - 200
V)
707
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