YASKAWA GA80U4720ABM, Manual

Page: 912 / 1016

12.9 L: Protection Functions
912 YASKAWA SIEPC71061737B GA800 Drive Technical Reference
No. Name Configuring Settings
L2-29 [Kinetic Energy Backup Method]
0 1 2 3
L3-21 OVSuppression Accel/Decel P
Gain
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 .
- x - -
L3-24 Motor Accel Time @ Rated
Torque
Set the motor acceleration time to the maximum frequency at the motor rated torque.
- x - -
L3-25 Load Inertia Ratio Sets the ratio between motor inertia and machine inertia.
- x
*3
- -
*1 When L2-29 = 0 [Kinetic 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 [Kinetic 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 [Kinetic Energy Backup Decel Time] .
*3 The drive sets this value automatically when KEB Tuning completes correctly.
■
L2-01: Power Loss Ride Through Select
No.
(Hex.)
Name Description
Default
(Range)
L2-01
(0485)
Power Loss Ride Through
Select
Sets the drive operation after a momentary power loss.
0
(0 - 5)
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 : Disabled
The drive detects Uv1 [DC Bus Undervoltage] is detected when a there is a momentary power loss.
If you do not return power in 15 ms, it triggers Uv1 and the drive shuts off the output. The motor coasts to stop.
1 : Enabled for L2-02 Time
When power returns in the time set in L2-02 [Power Loss Ride Through Time] , 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:
•
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
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 enables longer support for power loss than when L2-01 = 1 .
3 : Kinetic Energy Backup: L2-02
If power does not return in the time set in L2-02 , the drive will detect Uv1 .
If the drive detects momentary power loss, the drive will use regenerative energy from the motor and ramp to stop.
When you return power in the time set in
L2-02 , the drive will accelerate to the frequency reference value that was
used before the power loss. If you do not return power in the time set to L2-02 , the drive will detect Uv1 and the drive
output will turn OFF. L2-29 [Kinetic Energy Backup Method] sets the type of KEB operation.
4 : Kinetic Energy Backup: CPU Power
When power returns and the drive control circuit has power, the drive will restart.
The drive decelerates using regenerative energy from the motor until the power returns and then restarts when a
momentary power loss is detected. When power is restored during deceleration, the drive accelerates the motor again
to the frequency reference value used before the power loss. If the motor comes to a stop before the power returns, the
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