YASKAWA A1000 Technical Manual page 280

5.8 L: Protection Functions

L2-05: Undervoltage Detection Level (Uv)
Determines the voltage at which a Uv1 fault is triggered or at which the KEB function is activated. This setting rarely
needs to be changed.
No.
L2-05
<1> Values are specific to 200 V class drives. Double the value for 400 V class drives.
<2> The default setting for 400 V class drives depends on whether the drive input voltage is over 400 V or under 400 V.
Note: 1. When setting L2-05 below the default value, an AC reactor option should be installed to the input side of the power supply to prevent
damage to drive circuitry.
2. If using KEB Ride-Thru and L2-05 is set too low, then undervoltage in the DC bus (uv1) will be triggered before KEB Ride-Thru can
be executed. Take caution not to set this value too low.

L2-06: KEB Deceleration Time
Sets the time to decelerate from the frequency reference at the time KEB Ride-Thru was initiated down to zero speed.
This setting can be used only when L2-29=2 System KEB Ride-Thru.
No.
L2-06
<1> Setting range is determined by the accel/decel time units set in C1-10. If the time is set in units of 0.01 s (C1-10 = 0), the setting range
becomes 0.00 to 600.00 s.

L2-07: KEB Acceleration Time
Sets the time to reaccelerate from the speed when KEB was deactivated to the frequency reference.
When set to 0.0 s, the drive will accelerate back up to speed according to the active deceleration time set by C1-01,
C1-03, C1-05, or C1-07.
No.
L2-07
<1> Setting range is determined by the accel/decel time units set in C1-10. If the time is set in units of 0.01 s (C1-10 = 0), the setting range becomes
0.00 to 600.00 s.

L2-08: Frequency Gain at KEB Start
When the KEB Ride-Thru command is input, the output frequency is reduced in a single step in order to quickly get the
motor into a regenerative state. The amount of this frequency reduction can be calculated using the formula below. Note
that L2-08 can only be used with induction motors.
Amount of reduction = Slip frequency prior to KEB  (L2-08/100)  2
No.
L2-08

L2-10: KEB Detection Time (Minimum KEB Time)
Parameter L2-10 determines how long KEB Ride-Thru must operate once it is triggered. Also refer to
End Detection on page
No.
L2-10

L2-11: DC Bus Voltage Setpoint during KEB
Determines the setpoint (target value) for the DC bus voltage during Single KEB Ride-Thru 2. For Single KEB
Ride-Thru 1 and System KEB Ride-Thru, parameter L2-11 defines the voltage level to end KEB Ride-Thru.
No.
L2-11
<1> Values are specific to 200 V class drives. Double the value for 400 V class drives.
280
Name
Undervoltage Detection Level
Name
KEB Deceleration Time
Name
KEB Acceleration Time
Name
Frequency Gain at KEB Start
276.
Name
KEB Detection Time
Name
DC Bus Voltage Setpoint during KEB
YASKAWA ELECTRIC SIEP C710616 27G YASKAWA AC Drive A1000 Technical Manual
Setting Range
150 to 210 Vdc Determined by E1-01
<1>
Setting Range
0.00 to 6000.0 s
<1>
Setting Range
0.00 to 6000.0 s
<1>
Setting Range
0 to 300%
KEB Ride-Thru
Setting Range
0 to 2000 ms
Setting Range
150 to 400 Vdc Determined by E1-01
<1>
Default
<2>
Default
0.00 s
Default
0.00 s
Default
100%
Default
50 ms
Default
<1>