YASKAWA GA800 Programming Manual page 451

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L2-11: KEB DC Bus Voltage Setpoint
No.
Name
(Hex.)
L2-11 KEB DC Bus Voltage
Setpoint
(0461)
Expert
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L2-29: Kinetic Energy Backup Method
No.
Name
(Hex.)
L2-29 Kinetic Energy Backup
Method
(0475)
Expert
Set L2-01 = 3, 4, or 5 [Momentary Power Loss Ope Select = KEB Mode, KEB Stop Mode, or KEB Decel to Stp] or
KEB Ride-Thru 1/2 [H1-xx = 65, 66, 7A, or 7B], to enable the KEB function.
0 : Single Drive KEB Ride-Thru 1
The drive monitors the DC bus voltage and uses regenerative energy from the motor to hold the DC bus voltage at the
level set in L2-11 [KEB DC Bus Voltage Setpoint].
The KEB operation continues and the deceleration rate changes as specified by C1-09 [Fast Stop Time].
Note:
• If the drive detects Uv1 [DC Bus Undervoltage] during KEB operation, decrease the value of C1-09.
• If the drive detects ov [Overvoltage] during KEB operation, increase the value of C1-09.
1 : Single Drive KEB Ride-Thru 2
The drive does KEB operation and automatically calculates the deceleration rate to make sure that the main circuit
electrical energy and main current voltage from motor regenerative energy is equal to L2-11 [DC Bus Vol Setpoint
during KEB].
2 : System KEB Ride-Thru 1
The drive does not monitor the DC bus voltage and decelerates as specified by the KEB deceleration time set in L2-
06.
Set L2-06 to the time necessary to decelerate from the frequency reference to 0 Hz when the drive detects a
momentary power loss. The drive can decelerate and keep constant deceleration rates for more than one drive.
Note:
If you keep constant deceleration rates for more than one drive, it can trigger ov faults. Use the dynamic braking option with System KEB
Ride-Thru 1 to prevent ov faults.
3 : System KEB Ride-Thru 2
The drive monitors the DC bus voltage and decelerates for the deceleration time set in L2-06.
If the DC bus voltage increases, the drive momentarily holds the frequency to prevent ov while deceleration
continues.
Note:
When you cannot use a dynamic braking option, use System KEB Ride-Thru.
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L2-30: KEB Zero Speed Operation
No.
Name
(Hex.)
L2-30 KEB Zero Speed Operation
(045E)
Expert
0 : Baseblock
1 : DC/SC Braking
YASKAWA TOEPYAIGA8002B GA800 Drive Programming
V/f CL-V/f OLV CLV AOLV
Sets the target value that controls the DC bus voltage to a constant level in Single Drive KEB Ride-
Thru 2. Sets the DC bus voltage level that completes the KEB operation for all other KEB methods.
V/f CL-V/f OLV CLV AOLV
Sets the KEB function operation mode.
V/f CL-V/f OLV CLV AOLV
Sets the operation when the output frequency decreases below the zero level (DC braking injection
starting frequency) during KEB deceleration when L2-01 = 3 to 5 [Power Loss Ride Through Select
= Kinetic Energy Backup: L2-02, Kinetic Energy Backup: CPU Power, or Kinetic Energy Backup:
DecelStop].
Description
OLV/PM AOLV/PM CLV/PM EZOLV OLV/PM
Description
OLV/PM AOLV/PM CLV/PM EZOLV OLV/PM
Description
OLV/PM AOLV/PM CLV/PM EZOLV OLV/PM
2.9 L: Protection Functions
Default
(Range)
Determined by E1-01
(Determined by E1-01)
Default
(Range)
0
(0 - 3)
Default
(Range)
0
(0, 1)
2
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