Parameter Details
2
2.9 L: Protection Functions
YASKAWA TOEPYAIGA5002A GA500 DRIVE PROGRAMMING 369
No. Name Configuring Settings
L2-29 [Kinetic Energy Backup Method]
0 1 2 3
L2-08 Frequency Gain at KEB Start • If ov occurs immediately after you start operation, decrease the setting value.
• If Uv1 occurs immediately after you start KEB deceleration, increase the setting
value.
x - x x
L2-10 Minimum KEB Time • With KEB Ride-Thru
There is Uv1 because you set a digital input for KEB Ride-Thru and the device
that controls the input operated too slowly after power loss.
• Without KEB Ride-Thru
If the DC bus voltage overshoots immediately after KEB Ride-Thru starts,
increase L2-10 to longer than the overshoot.
x x x x
L2-11 KEB DC Bus Voltage Setpoint • Single Drive KEB Ride-Thru 2
Set to approximately 1.22 x input voltage.
• Single Drive KEB Ride-Thru 1, System KEB Ride-Thru 1, or System KEB Ride-
Thru 2
Set to approximately 1.4 x input voltage.
x x x x
L3-20 DC Bus Voltage Adjustment
Gain
• If ov or Uv1 occurs at the start of deceleration when you use KEB operation,
increase this value in 0.1-unit increments.
• If there is torque ripple during deceleration when you use KEB Ride-Thru,
decrease the value.
- x - -
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 [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.
■ 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
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:
• 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
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