L2: Momentary Power Loss Ride-Thru - YASKAWA CIMR-VU BA0001 Technical Manual

5.8 L: Protection Functions
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L2: Momentary Power Loss Ride-Thru

n 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 be set to automatically
return to the operation it was performing when the power went out based on certain conditions.
No.
L2-01
Setting 0: Disabled (default)
If power is not restored within 15 ms, a Uv1 fault will result and the drive will stop the motor.
Setting 1: Enabled, Recover Within L2-02
When a momentary power loss occurs, the drive will attempt to restart and perform Speed Search if power is restored within
the period of time set to parameter L2-02. If power is not restored within the time set to L2-02 (i.e. DC bus voltage level
remains below Uv1 detection level L2-05), then a Uv1 fault is triggered and the drive output will be shut off.
Setting 2: Recover as Long as CPU has Power
Drive will try to restart as long as the CPU still has power. This allows for a longer ride-through time than setting L2-01 to 1.
A Uv1 fault is not triggered. This setting should also be used if the KEB function is utilized.
Note: 1. The amount of time the drive is capable of recovering after a power loss is determined by the capacity of the drive. Drive capacity
determines the upper limit for L2-02.
2. When L2-01 is set to 1 or 2, and a magnetic contactor between motor and drive is used, be sure that the magnetic contactor is kept close
as long as the drive attempts to restart.
3. When L2-01 is set to 1 or 2, "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.
n L2-02: Momentary Power Loss Ride-Thru Time
Set the time in which the power has to return before a Uv fault is tripped. This parameter is valid only if L2-01 = 1.
No.
L2-02
n L2-03: Momentary Power Loss Minimum Baseblock Time
Sets the minimum baseblock time when power is restored following a momentary power loss. This determines the time it takes
for the leftover voltage in the motor to dissipate. Increase this setting if overcurrent or overvoltage occur at the beginning of
Speed Search after a power loss or DC Injection Braking. If L2-03 > L2-02, then the drive will restart after the time set to
L2-03 has passed from the beginning of the power loss.
No.
L2-03 Momentary Power Loss Minimum Baseblock Time
n L2-04: Momentary Power Loss Voltage Recovery Ramp Time
Sets the time constant used to ramp up the voltage during Speed Search. The setting value determines the time for a change
from zero to the maximum voltage.
No.
L2-04 Momentary Power Loss Voltage Recovery Ramp Time
n L2-05: Undervoltage Detection Level
Determines the voltage at which a Uv1 fault is triggered or at which the KEB function is activated.
No.
<1>
L2-05
<1> Values are for 200 V class drives and must be doubled for 400 V class drives.
<2> This value is initialized when E1-01 is changed.
218
Name
Momentary Power Loss Operation Selection
Name
Momentary Power Loss Ride-Thru Time
Name
Name
Name
Undervoltage Detection Level
YASKAWA ELECTRIC SIEP C710606 18F YASKAWA AC Drive – V1000 Technical Manual
Setting Range
0 to 2
Setting Range
Determined by
0.0 to 25.5 s
Setting Range
Determined by
0.1 to 5.0 s
Setting Range
Determined by
0.0 to 5.0 s
Setting Range
150 to 210 V
Default
0
Default
o2-04.
Default
o2-04
Default
o2-04
Default
<2>
190 V