Yaskawa AC Drive-P1000 Industrial Fan - Manual (Page 245)

n L2-04: Momentary Power Loss Voltage Recovery Ramp Time
Sets the time for the drive to restore the output voltage to the level specified by the V/f pattern after Speed Search. The setting
value determines the time for the voltage to go from 0 V to the maximum voltage.
No. Name Setting Range Default
L2-04 Momentary Power Loss Voltage Recovery Ramp Time 0.0 to 5.0 s Determined by o2-04
n 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. Name Setting Range Default
L2-05 Undervoltage Detection Level 150 to 210 Vdc <1>
Determined by
E1-01 <2>
<1> Values are specific to 200 V class drives. Double the value for 400 V class drives. Multiply the value by 2.875 for 600 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. Install an AC reactor option on the input side of the power supply when setting L2-05 below the default value 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.
n L2-06: KEB Deceleration Time
Sets the time to decelerate from the frequency reference at the time KEB Ride-Thru was initiated to zero speed. This setting
can be used only when L2-29 = 2 ( System KEB Ride-Thru 1).
No. Name Setting Range Default
L2-06 KEB Deceleration Time 0.00 to 6000.0 s <1> 0.00 s
<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.
n 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 to speed according to the active acceleration time set in C1-01 or C1-03.
No. Name Setting Range Default
L2-07 KEB Acceleration Time 0.00 to 6000.0 s <1> 0.00 s
<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.
n L2-08: Frequency Gain at KEB Start
When the KEB Ride-Thru command is input, the output frequency is reduced in a single step to quickly get the motor into a
regenerative state. Calculate the amount of this frequency reduction using the formula below. L2-08 can only be used with
induction motors.
Amount of reduction = Slip frequency prior to KEB × (L2-08/100) × 2
No. Name Setting Range Default
L2-08 Frequency Gain at KEB Start 0 to 300% 100%
n L2-10: KEB Detection Time (Minimum KEB Time)
No. Name Setting Range Default
L2-10 KEB Detection Time 0 to 2000 ms 50 ms
n 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.
5.8 L: Protection Functions
YASKAWA SIEP YAIP1U 01B AC Drive - P1000 Technical Manual 245
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Parameter Details