YASKAWA E1000 Technical Manual page 219

Parameter Name
L2-06 KEB Deceleration Time
L2-07 KEB Acceleration Time
L2-08 Frequency Gain at KEB Start
L2-10 KEB Detection Time
Desired DC Bus Voltage
L2-11
during KEB
L3-20 Main Circuit Adjustment Gain
Accel/Decel Rate
L3-21
Calculation Gain
L3-24 Motor Acceleration Time
L3-25 Load Inertia Ratio
■
L2-02: Momentary Power Loss Ride-Thru Time
Sets the maximum time allowed to ride through a power loss. If power loss operation exceeds this time, the drive will
attempt to accelerate back to frequency reference. This parameter is valid if L2-01 = 1 or 3.
Note: The amount of time the drive is capable of recovering after a power loss is determined by the capacity of the drive. Drive
capacity determines the upper limit for L2-02.
No.
L2-02
■
L2-03: Momentary Power Loss Minimum Baseblock Time
Sets the minimum baseblock time when power is restored following a momentary power loss. This determines the time
the drive waits for the residual voltage in the motor to dissipate. Increase this setting if overcurrent or overvoltage occurs
at the beginning of Speed Search, after a power loss, or during DC Injection Braking.
No.
L2-03
■
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.
L2-04
■
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>
<1> Values are for 200 V class drives and must be doubled for 400 V class drives.
<2> The default setting for 400 V class drives will vary depending on if the drive input voltage is over 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.
YASKAWA ELECTRIC SIEP C710616 35D YASKAWA AC Drive E1000 Technical Manual
• Increase if an overvoltage fault (ov) occur during KEB deceleration.
• Decrease if an undervoltage fault (Uv1) occurs during KEB deceleration.
Adjust to the desired acceleration time. If set to 0, standard acceleration times are used (C1-01, C1-03).
• Increase if an undervoltage fault occurs right after KEB operation starts.
• Decrease if an overvoltage fault occurs right after KEB operation starts.
• Increase when a digital input is set for KEB Ride-Thru and an undervoltage fault occurs after power was lost
because the device that controls the input does not react quickly enough.
• If the DC bus voltage overshoots after KEB Ride-Thru begins (and no input terminal is set to KEB Ride-
Thru), increase L2-10 to longer than the overshoot.
• Set to around 1.22 times the input voltage for Single Drive KEB Ride-Thru 2.
• Set to around 1.4 times the input voltage for Single Drive KEB Ride-Thru 1.
• Increase this setting slowly in steps of 0.1 if overvoltage (ov) or undervoltage (Uv1) occurs at the beginning
of deceleration.
• Reduce if torque ripple occurs during deceleration while executing KEB Ride-Thru.
• Reduce L3-21 in steps of 0.05 if there is a fairly large speed or current ripple.
• Decreasing this setting too much can result in a slow DC bus voltage control response, and may lead to
problems with overvoltage or undervoltage.
Set the motor acceleration time as described on page 226.
Set the load/inertia ratio as described on page 226.
Name
Momentary Power Loss Ride-Thru Time
Name
Momentary Power Loss Minimum Baseblock Time
Name
Momentary Power Loss Voltage Recovery Ramp Time
Name
Undervoltage Detection Level
5.8 L: Protection Functions
Setting Instructions
Setting Range
0.0 to 25.5 s
Setting Range
0.1 to 5.0 s
Setting Range
0.0 to 5.0 s
Setting Range
150 to 210 Vdc
KEB Mode
(L2-29)
0 1
NO NO
YES YES
YES NO
YES YES
YES YES
NO YES
NO YES
NO YES
NO YES
Default
Determined by o2-04
Default
Determined by o2-04
Default
Determined by o2-04
5
Default
Determined by A1-02,
E1-01 and o2-04
<2>
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