Table 5.35 KEB Function Related Adjustments
Parameter
Name
Setting Instructions
KEB Mode (L2-29)
0
1
2
3
C1-09
Fast Stop Time
• Increase if an overvoltage fault occurs during KEB deceleration.
• Decrease if an undervoltage fault occurs during KEB deceleration.
YES NO NO NO
C2-03
S-Curve at Deceleration
Start
• Shorten if undervoltage occurs immediately after KEB Ride-Thru is
triggered.
• Lengthen this setting if overvoltage occurs immediately after KEB
operation starts.
YES NO YES YES
L2-05
Undervoltage Detection
Level
Increase if an undervoltage fault occurs at KEB operation start to let the
drive detect power loss more quickly.
YES YES YES YES
L2-06
KEB Deceleration Time
• Increase if an overvoltage fault occurs during KEB deceleration
• Decrease if an undervoltage fault occurs during KEB deceleration
NO NO YES YES
L2-07
KEB Acceleration Time Adjust to the desired acceleration time. If set to 0, standard acceleration
times are used (C1-01, C1-03, C1-05, C1-07).
YES YES YES YES
L2-08
Frequency Gain at KEB
Start
• Increase if an undervoltage fault occurs immediately after KEB
operation starts.
• Decrease if an overvoltage fault occurs immediately after KEB
operation starts.
YES NO YES YES
L2-10
KEB Detection Time
• Increase when a digital input is set for KEB Ride-Thru and an
undervoltage fault occurs after power was lost because the device
controlling 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.
YES YES YES YES
L2-11
Desired DC Bus Voltage
during KEB
• Set to approximately 1.22 times the input voltage for Single Drive
KEB Ride-Thru 2.
• Set to approximately 1.4 times the input voltage for Single Drive KEB
Ride-Thru 1 and System KEB Ride-Thru modes.
YES YES YES YES
L3-20
Main Circuit Adjustment
Gain
• Increase this setting in steps of 0.1 if overvoltage or undervoltage
occurs at the beginning of deceleration
• Reduce if torque ripple occurs during deceleration while executing
KEB Ride-Thru.
NO YES NO NO
L3-21
Accel/Decel Rate
Calculation Gain
• Reduce L3-21 in steps of 0.05 if there is a fairly large speed or current
ripple.
• Decreasing this setting too much can cause a slow DC bus voltage
control response, and may lead to problems with overvoltage or
undervoltage.
NO YES NO NO
L3-24
Motor Acceleration Time Set the motor acceleration time as described on page
NO YES NO NO
L3-25
Load Inertia Ratio
Set the load/inertia ratio as described on page
.
NO YES NO NO
n
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 the 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.
Name
Setting Range
Default
L2-02
Momentary Power Loss Ride-Thru Time
0.0 to 25.5 s
Determined by o2-04
n
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.
Name
Setting Range
Default
L2-03
Momentary Power Loss Minimum Baseblock Time
0.1 to 5.0 s
Determined by o2-04
5.8 L: Protection Functions
YASKAWA SIEP YAIP1U 01C AC Drive - P1000 Technical Manual
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Parameter Details
