YASKAWA HV600 Technical Reference page 321

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.
Note:
When you set L2-01, make sure that you know these items:
• You can use a Momentary Power Loss Unit on models D007 to D059 and B001 to B021 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 L2-01 = 1 or 2, 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.
■
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 [Power Loss Ride Through Select = Enabled for L2-02 Time]. 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.
■
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.
■
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].
YASKAWA SIEPYAIH6B01A HV600 AC Drive Bypass Technical Reference
Sets the maximum time that the drive will wait until it tries to restart after power loss.
Sets the minimum time to continue the drive output block (baseblock) after a baseblock.
Sets the time for the drive output voltage to go back to the correct voltage after it completes speed
searches.
Description
Description
Description
5.8 L: Protection Functions
Default
(Range)
Determined by o2-04
(0.0 - 25.5 s)
Default
(Range)
Determined by o2-04
(0.1 - 5.0 s)
Default
(Range)
Determined by o2-04
(0.0 - 5.0 s)
5
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