YASKAWA A1000 HHP Programming Manual page 139

Parameter Name
C1-09 Fast Stop Time
C2-03 S-Curve at Deceleration Start
Undervoltage Detection
L2-05
Level
L2-07 KEB Acceleration Time
L2-10 KEB Detection Time
Desired DC Bus Voltage
L2-11
during KEB
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.
L2-02
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.
L2-03 Momentary Power Loss Minimum Baseblock Time
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.
L2-04 Momentary Power Loss Voltage Recovery Ramp Time
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.
YASKAWA ELECTRIC SIEP YEAHHP 01B YASKAWA AC Drive – A1000 HHP Programming Manual
Table 1.42 KEB Function Related Adjustments
• Increase if an overvoltage fault occurs during KEB deceleration.
• Decrease if an undervoltage fault occurs during KEB deceleration.
• Shorten if undervoltage occurs immediately after KEB Ride-Thru is triggered.
• Lengthen this setting if overvoltage occurs immediately after KEB operation
starts.
Increase if an undervoltage fault occurs at KEB operation start to let the drive detect
power loss more quickly.
Adjust to the desired acceleration time. If set to 0, standard acceleration times are
used (C1-01, C1-03, C1-05, C1-07).
• 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.
• 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.
Name
Momentary Power Loss Ride-Thru Time
Name
Name
1.8 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
KEB
Mod
e
0
YES
YES
YES
YES
YES
YES
Default
Determined by C6-01
and o2-04
Default
Determined by C6-01
and o2-04
Default
Determined by
C6-01 and o2-04
1
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