YASKAWA CIPR-GA50C series, Technical Manual

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12.9 L: Protection Functions
676 YASKAWA SIEPC71061753A GA500 Technical Manual
No. Name Configuring Settings
L2-29 [Kinetic Energy Backup Method]
0 1 2 3
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
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 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 lets the drive lose power for longer 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 the drive 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 drive loses control power and the drive output shuts off. A
Uv1 is not triggered when power is restored
while power to the CPU in the drive is maintained. L2-29 sets the type of KEB operation.
5 : Kinetic Energy Backup: DecelStop
When power returns, the drive will continue to decelerate until the motor fully stops.
If the drive detects momentary power loss, the drive will use regenerative energy from the motor and ramp to
stop. When you return power to the drive, the drive will continue to decelerate until the motor comes to a full
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