YASKAWA GA800 Programming Manual page 448

2.9 L: Protection Functions
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 stop. After
you return power, the drive will ramp to stop in the set deceleration time. L2-29 sets the type of KEB operation.
Note:
When you set L2-01, make sure that you know these items:
• You can use a Momentary Power Loss Unit on models 2004 to 2056 and 4002 to 4031 for a longer momentary power loss ride through
time. A Momentary Power Loss Unit makes it possible to continue operation of the drive after a maximum of 2 seconds of power loss.
• When you set L2-01 = 1 to 4, keep the magnetic contactor on the drive input side closed and keep the control signal while the drive does
KEB operation.
• When L2-01 = 1 to 5, Uv [DC Bus Undervoltage] will flash on the keypad while the drive is attempting to recover from a momentary
power loss. The drive will not output a fault signal at this time.
• When you use a magnetic contactor between the motor and the drive, keep the magnetic contactor closed while the drive does KEB
operation or tries to restart with Speed Search.
• Keep the Run command active during KEB operation. The drive cannot accelerate back to the frequency reference when the power returns.
• When you set L2-01 = 3 to 5, if the control power supply voltage is less than the CPU operation level during KEB Ride-Thru, it will trigger
Uv1.
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L2-02: Power Loss Ride Through Time
No.
Name
(Hex.)
L2-02 Power Loss Ride Through
Time
(0486)
This function is applicable when L2-01 = 1, 3 [Power Loss Ride Through Select = Enabled for L2-02 Time, Kinetic
Energy Backup: L2-02]. If power loss operation is longer than the time set in this parameter, the drive will detect Uv1
[DC Bus Undervoltage], turn OFF output, and the motor will coast to stop.
Note:
• The length of time that the drive can recover after a power loss changes when drive capacity changes.
• The upper limit of the possible momentary power loss Ride-Thru time changes when drive capacity changes.
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L2-03: Minimum Baseblock Time
No.
Name
(Hex.)
L2-03 Minimum Baseblock Time
(0487)
Sets the length of time that the drive will wait for the residual voltage in the motor to dissipate in estimation to the
secondary circuit time constant of the motor. If oC [Overcurrent] or ov [DC Bus Overvoltage] occur at the start of
Speed Search, after power returns, or during DC Injection Braking, increase this setting.
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L2-04: Powerloss V/f Recovery Ramp Time
No.
Name
(Hex.)
L2-04 Powerloss V/f Recovery
Ramp Time
(0488)
Sets the time for voltage to recover from 0 V to the value set in E1-05 [Maximum Output Voltage].
448
V/f CL-V/f OLV CLV AOLV
Sets the maximum time that the drive will wait until trying to restart after power loss.
V/f CL-V/f OLV CLV AOLV
Sets the minimum time to continue the drive output block (baseblock) after a baseblock.
V/f CL-V/f OLV CLV AOLV
Sets the time for the drive output voltage to go back to correct voltage after completing speed
searches.
Description
OLV/PM AOLV/PM CLV/PM EZOLV OLV/PM
Description
OLV/PM AOLV/PM CLV/PM EZOLV OLV/PM
Description
OLV/PM AOLV/PM CLV/PM EZOLV OLV/PM
YASKAWA TOEPYAIGA8002B GA800 Drive Programming
Default
(Range)
Determined by o2-04, C6-01
(0.0 - 25.5 s)
Default
(Range)
Determined by o2-04, C6-01
(0.1 - 5.0 s)
Default
(Range)
Determined by o2-04, C6-01
(0.0 - 5.0 s)