Parameter Details
11
11.9 L: Protection Functions
YASKAWA ELECTRIC SIEP C710617 05F YASKAWA AC Drive GA700 Technical Manual 951
■ 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] is triggered when a momentary power loss occurs.
If power is not restored within 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 Uv1. This
function lets the power loss be 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.
When the drive detects momentary power loss, the drive will use regenerative energy from the motor through
KEB operation to decelerate. 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 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. The type of KEB operation is determined by L2-29.
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
stop. After you return power, the drive will ramp to stop in the set deceleration time. L2-29 sets the type of KEB
operation.
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