Yaskawa CIMR-PUxA - Manual (Page 131)

No. Name Setting Range Default
L2-01 Momentary Power Loss Operation Selection 0 to 5 2
Setting 0: Disabled
If power is not restored within 15 ms, a Uv1 fault will result and the motor coasts to stop.
Setting 1: Recover within L2-02
When a momentary power loss occurs, the drive output will be shut off. If the power returns within the time set to parameter
L2-02, the drive will perform Speed Search and attempt to resume operation. If power is not restored within this time (i.e.,
DC bus voltage level remains below Uv1 detection level L2-05), then a Uv1 fault is triggered and the drive will stop.
Setting 2: Recover as long as CPU Has Power
When a momentary power loss occurs, the drive output will be shut off. If the power returns and the drive control circuit has
power, the drive will attempt to perform Speed Search and resume the operation. This will not trigger a Uv1 fault.
Setting 3: Kinetic Energy Backup (KEB) Ride-Thru Operation within L2-02
The drive decelerates using regenerative energy from the motor until the time set in L2-02 has expired. It then tries to accelerate
back to the frequency reference. If the power does not return within the time set to L2-02, it will trigger a Uv1 fault and the
drive output will shut off. The type of KEB operation is determined by the L2-29 setting.
Setting 4: KEB Ride-Thru as long as CPU Has Power
The drive decelerates using regenerative energy from the motor until the power returns and then restarts. If the motor comes
to a stop before the power returns, the drive loses control power and the drive output shuts off. A Uv1 fault is not triggered.
The type of KEB operation is determined by the L2-29 setting.
Setting 5: Ramp to Stop with KEB Deceleration
The drive ramps to stop using the regenerative energy from the motor. Even if the power is restored, the drive will continue
to decelerate until the motor comes to a complete stop. The type of KEB operation is determined by the L2-29 setting. If an
input terminal set for KEB 1 (H1-oo = 65, 66) is triggered while the drive is decelerating, it will accelerate back up to speed
when the input is released.
Notes on Settings 1 through 5
• “Uv” will flash on the operator while the drive is attempting to recover from a momentary power loss. A fault signal is not
output at this time.
• A Momentary Power Loss Unit is available to allow for a longer momentary power loss ride through time in models
2A0004 to 2A0056 and 4A0002 to 4A0031. This option makes it possible to continue running the drive after up to two
seconds of power loss.
• When using a magnetic contactor between the motor and the drive, keep the magnetic contactor closed as long as the drive
performs KEB operation or attempts to restart with Speed Search.
• Keep the Run command active during KEB operation or the drive cannot accelerate back to the frequency reference when
the power returns.
• When L2-01 is set to 3, 4, or 5, KEB Ride-Thru will be executed as specified in L2-29.
n L5-01: Number of Auto Restart Attempts
Sets the number of times that the drive may attempt to restart itself.
Parameter L5-05 determines the method of incrementing the restart counter. When the counter reaches the number set to L5-01,
the operation stops and the fault must be manually cleared and reset.
The restart counter is incremented at each restart attempt, regardless of whether the attempt was successful. When the counter
reaches the number set to L5-01, the operation stops and the fault must be manually cleared and reset.
The number of fault restarts is reset to zero when:
• The drive operates normally for 10 minutes following a fault restart.
• A fault is cleared manually after protective functions are triggered.
• The power supply is cycled.
No. Name Setting Range Default
L5-01 Number of Auto Restart Attempts 0 to 10 Times 0 Times
n L5-04: Fault Reset Interval Time
Determines the amount of time to wait between restart attempts when parameter L5-05 is set to 1.
4.12 Fan and Pump Application Preset Details
YASKAWA ELECTRIC TOEP YAIP1U 01B YASKAWA AC Drive - P1000 Quick Start Guide 131
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Start-Up Programming & Operation