YASKAWA FSDrive-MV1000 Parameter Manual page 203

u L2: Momentary Power Loss Ride-Thru/Main Power Supply
L2-01: Momentary Power Loss Ride-Thru Operation Selection
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When a momentary power loss Ride-Thru occurs (DC bus voltage falls below the level set in L2-05 or an IUV fault
results), the drive can be set to automatically return to the operation it was performing when the power went out based on
certain conditions. When using the Momentary Power Loss Ride-Thru function, a Momentary Power Loss Ride-Thru
unit (option) is required.
No.
Momentary Power Loss Ride-Thru Operation
L2-01
Setting 0: Disabled (default)
If power is not restored before a Uv1 fault or an IUV fault results, the drive will stop the motor. The motor coasts to stop.
Setting 1: Enabled
When a momentary power loss ride-thru occurs, the drive output will be shut off. Should the power return 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 ride-thru occurs, the drive output will be shut off. Should the power return as long as the
drive control circuit has power, the drive will attempt to perform Speed Search and resume the operation. A Uv1 fault is
not triggered.
KEB Ride-Thru Function
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When power loss is detected, the Kinetic Energy Backup Ride-Thru function (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.
KEB Ride-Thru Start
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KEB operation is always triggered in the same way, independent of the selected KEB operation mode. When the KEB
function is selected as the function to be executed when power loss ride-thru operation occurs (L2-01 = 3, 4, or 5), then
KEB Ride-Thru will be activated if the DC bus voltage falls below the level specified in L2-05.
If a contact input is used for triggering the KEB operation and the device that controls the input acts relatively slow,
parameter L2-10 can be used to set a minimum KEB operation time. In the example below, KEB operation is triggered
by the DC bus voltage and the Hold command is triggered by a contact input.
YASKAWA ELECTRIC TOEP C710687 03B FSDrive-MV1000 Parameter Guide
Name
Selection
Setting Range
0 to 2
2.8 L: Protection Functions
Default
0
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