YASKAWA GA800 Technical Reference page 970

12.9 L: Protection Functions
No. Name
L3-21 OVSuppression Accel/Decel P
Gain
L3-24 Motor Accel Time @ Rated
Torque
L3-25 Load Inertia Ratio
*1 When L2-29 = 0 [KEB Energy Backup Method = Single Drive KEB Ride-Thru 1] and you do KEB Auto-Tuning, the drive will
automatically set C1-09. If you must not change the Fast Stop time, do not do KEB Tuning.
*2 If you do KEB Tuning when L2-29 = 1, 2, or 3 [KEB Energy Backup Method = Single Drive KEB Ride-Thru 2, System KEB Ride-Thru 1
or System KEB Ride-Thru 2], the drive will automatically set L2-06 [KEB Decel Time].
*3 The drive sets this value automatically when KEB Tuning completes correctly.
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L2-01: Power Loss Ride Through Select
No.
Name
(Hex.)
L2-01 Power Loss Ride Through
Select
(0485)
The drive detects momentary power loss when the drive DC bus voltage is less than the value set in L2-05
[Undervoltage Detection Lvl (Uv1)].
0 : Disable
A momentary power loss triggers Uv1 [DC Bus Undervoltage].
If you do not restore power in 15 ms, a Uv1 is triggered and the drive shuts off the output. The motor coasts to stop.
1 : Enabled
This setting will enable for the time set in L2-02 [Power Loss Ride Through Time] or until the CPU is inactive. When
the CPU is inactive, b1-17 [Run Command at Power Up] sets operation at power up.
When power returns in the time set in L2-02, the drive will restart. If power does not return in the time set in L2-02,
the drive will detect Uv1.
The drive momentarily turns OFF its output after a power loss. If the power returns in the time set to L2-02, the drive
will do Speed Search and try to continue operation.
If the DC bus voltage is less than or equal to the Uv1 detection level for the time set in L2-02, the drive will detect
Uv1 and output a fault signal.
Note:
• This setting will enable for the time set in L2-02 [Power Loss Ride Through Time] or until the CPU is inactive. When the CPU is inactive,
b1-17 [Run Command at Power Up] sets operation at power up.
• The necessary time for the drive to restart after power returns is different for different drive capacities.
• The upper limit of the possible momentary power loss Ride-Thru time is different for different drive models.
2 : Enabled while CPU Power Active
This setting will enable for the time set in L2-02 [Power Loss Ride Through Time] or until the CPU is inactive. When
the CPU is inactive, b1-17 [Run Command at Power Up] sets operation at power up.
When power returns and the drive control circuit has power, the drive will restart. This will not trigger Uv1.
When there is a momentary power loss, the drive output will turn OFF. If the power returns and the drive control
circuit has power, the drive will do Speed Search and try to continue operation. This will not trigger a Uv1. This
function lets the drive lose power for longer than when L2-01 = 1.
Note:
This setting will enable for the time set in L2-02 [Power Loss Ride Through Time] or until the CPU is inactive. When the CPU is inactive,
b1-17 [Run Command at Power Up] sets operation at power up.
3 : Kinetic Energy Backup: L2-02
If power does not return in the time set in L2-02, the drive will detect Uv1.
970
Configuring Settings
If there is large speed or current ripple, decrease the value in 0.05 unit increments.
Note:
If the setting value is too low, then the drive will have unsatisfactory DC bus
voltage control response. The drive can detect ov or Uv1.
Set the motor acceleration time to the maximum frequency at the motor rated torque.
Sets the ratio between motor inertia and machine inertia.
V/f CL-V/f OLV CLV
Sets the drive operation after a momentary power loss.
Description
AOLV OLV/PM AOLV/PM CLV/PM EZOLV OLV/PM
YASKAWA SIEPC71061737D GA800 Drive Technical Reference
L2-29 [Kinetic Energy Backup Method]
0 1 2
- x -
- x -
*3
- x -
Default
(Range)
0
(0 - 5)
3
-
-
-