|
No.
(Hex.)
|
Name
|
Description
|
Default
(Range)
|
|
L2-29
(0475)
Expert
|
Kinetic Energy Backup Method
|
        
Sets the KEB function operation mode.
|
0
(0 - 3)
|
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.