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L1-13: Continuous Electrothermal Operation Selection
Determines whether to hold the current value of the electrothermal motor protection (L1-01) when the power supply is
interrupted.
No. Name Setting Range Default
L1-13 Continuous Electrothermal Operation Selection 0, 1 1
Setting 0: Disabled
Setting 1: Enabled
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L2: Momentary Power Loss Ride-Thru
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L2-01: Momentary Power Loss Operation Selection
When a momentary power loss occurs (DC bus voltage falls below the level set in L2-05), the drive can automatically return
to the operation it was performing prior to the power loss based on certain conditions.
No. Name Setting Range Default
L2-01 Momentary Power Loss Operation Selection 0 to 5 0
Setting 0: Disabled (default)
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 the power does not return within this time, it
will trigger a Uv1 fault.
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.
• 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.
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KEB Ride-Thru Function
When the drive detects a power loss, KEB Ride-Thru decelerates the motor and uses regenerative energy to keep the main
circuit operating. Despite power loss, the drive output is not interrupted.
Choose between Single Drive KEB Ride-Thru 1 and 2 (L2-29 = 0 or 1 for applications driven by a single drive.
5.8 L: Protection Functions
YASKAWA ELECTRIC SIEP C710616 31B YASKAWA AC Drive – A1000 Technical Manual
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Parameter Details
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