5.8 L: Protection Functions
YASKAWA ELECTRIC SIEP C710616 30B YASKAWA AC Drive T1000A Technical Manual 217
Parameter Details
5
u 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.
Setting 0: Disabled (default)
If power is not restored within 15 ms, a Uv1 fault will result and the drive will stop the motor. The motor coasts to stop.
Setting 1: Recover within L2-02
When a momentary power loss occurs, the drive output will be shut off. Should the power return within the time set to
parameter L2-02, th
e drive will perform Speed Search and attempt to resume operation. If power is not restored within
the time set by L2-02 (i.e., DC bus voltage level remains below Uv1 detection level L2-05), then a Uv1 fault is triggered.
Setting 2: Recover as long as CPU has power
When a momentary power loss occurs, the drive output will be shut off. Should the power return as long as the drive
control circuit has power, th
e drive will attempt to perform Speed Search and resume the operation. A Uv1 fault is not
triggered.
Note: It is not necessary to set this parameter to a value greater than 0 when using the KEB function. The KEB function is enabled by
setting S4-01 to a value greater than 0.
n L2-02: Momentary Power Loss Ride-Thru Time
Sets the maximum time allowed to ride through a power loss. If power loss operation exceeds this time, the drive will
attempt to accelerate back to frequency reference. This parameter is valid when L2-01 = 1 or S4-01 = 2.
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.
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
the drive waits for the residual voltage in the motor to dissipate. Increase this setting if overcurrent or overvoltage occurs
at the beginning of Speed Search, after a power loss, or during DC Injection Braking.
n
L2-04: Momentary Power Loss Voltage Recovery Ramp Time
Sets the time for the drive to restore the output voltage to the level specified by the V/f pattern after Speed Search. The
setting value determines the time for the voltage to go from 0 V to the maximum voltage.
n
L2-05: Undervoltage Detection Level (Uv)
Determines the voltage at which a UV1 fault is triggered (when the drive is running and L2-01 = 0) or when a UV alarm
is triggered (when the drive is not running or L2-01 is set > 0, or when the KEB function is active).
No. Name Setting Range Default
L2-01 Momentary Power Loss Operation Selection 0 to 2 0
No. Name Setting Range Default
L2-02 Momentary Power Loss Ride-Thru Time 0.0 to 25.5 s
Determined by C6-01 and
o2-04
No. Name Setting Range Default
L2-03 Momentary Power Loss Minimum Baseblock Time 0.1 to 5.0 s
Determined by C6-01
and o2-04
No. Name Setting Range Default
L2-04 Momentary Power Loss Voltage Recovery Ramp Time 0.0 to 5.0 s
Determined by C6-01 and
o2-04
No.
<1> Values are for 200 V class drives and must be doubled for 400 V class drives.
Name Setting Range Default
L2-05 <1> Undervoltage Detection Level 150 to 250 Vdc 190 V <2>
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