YASKAWA GA800 Technical Reference page 974

12.9 L: Protection Functions
Note:
• When L2-01 = 0, 1, or 2 [Disabled, Enabled for L2-02 Time, or Enabled while CPU Power Active], increase the value of L2-10. Set L2-10
to cancel KEB operation if the KEB Ride-Thru is not input.
• Setting L2-10 to 0 ms disables the function of L2-10.
■
L2-11: KEB DC Bus Voltage Setpoint
No.
Name
(Hex.)
L2-11 KEB DC Bus Voltage
Setpoint
(0461)
Expert
■
L2-29: Kinetic Energy Backup Method
No.
Name
(Hex.)
L2-29 Kinetic Energy Backup
Method
(0475)
Expert
Set L2-01 = 3, 4, or 5 [Power Loss Ride Through Select = Kinetic Energy Backup: L2-02, Kinetic Energy Backup:
CPU Power, or Kinetic Energy Backup: DecelStop] 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.
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.
Use L2-06 to set the time necessary to decelerate from the current frequency reference to 0 Hz. More than one drive
can decelerate and keep a constant speed ratio between drives.
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.
3 : System KEB Ride-Thru 2
The drive uses the KEB deceleration time set in L2-06 to decelerate and it also monitors the DC bus voltage.
If the voltage level increases, the drive momentarily holds the frequency to prevent an ov before it continues to
decelerate.
Note:
When you cannot use a dynamic braking option, use System KEB Ride-Thru.
974
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.
Description
OLV/PM AOLV/PM CLV/PM EZOLV OLV/PM
Description
OLV/PM AOLV/PM CLV/PM EZOLV OLV/PM
YASKAWA SIEPC71061737D GA800 Drive Technical Reference
Default
(Range)
Determined by E1-01
(Determined by E1-01)
Default
(Range)
0
(0 - 3)