Table 1.42 KEB Function Related Adjustments
Parameter
Name
Setting Instructions
KEB
Mod
e
0
C1-09
Fast Stop Time
• Increase if an overvoltage fault occurs during KEB deceleration.
• Decrease if an undervoltage fault occurs during KEB deceleration.
YES
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
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
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
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
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
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 C6-01
and 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 C6-01
and o2-04
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
C6-01 and 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.
1.8 L: Protection Functions
YASKAWA ELECTRIC SIEP YEAHHP 01B YASKAWA AC Drive – A1000 HHP Programming Manual
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Parameter Details
Summary of Contents for A1000 HHP
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