No. Name Setting Range Default
L2-01 Momentary Power Loss Operation Selection 0 to 2 0
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, with Time Limit
When a momentary power loss occurs, the drive will attempt to restart and perform Speed Search if power is restored within
a certain period of time. If power is not restored within this time, then a Uv1 fault is triggered and the drive output will be shut
off. The allowable time for the momentary power loss condition is dependent on the drive capacity.
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.
Note: 1. 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.
2. 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.
u
L3: Stall Prevention
When the load is too high or acceleration and deceleration times are too short, the motor may be unable to keep up with the
frequency reference, resulting in excessive slip. This “stalling” makes it impossible to decelerate or accelerate. The drive can
prevent the motor from stalling and still reach the desired speed without the user needing to change the acceleration or
deceleration time settings. The Stall Prevention function can be set separately for acceleration, operating at constant speeds,
and deceleration.
n
L3-01: Stall Prevention During Acceleration Selection
Stall Prevention during acceleration is used when the motor loses speed during acceleration due to a relatively large load. It
prevents overcurrent and motor overload (oL1) from occurring.
This parameter sets the Stall Prevention method for acceleration.
No. Name Setting Range Default
L3-01 Stall Prevention Selection during Acceleration 0 to 1 1
Setting 0: Disabled
No Stall Prevention is provided. If the acceleration time setting is too short, the drive may not be able to accelerate within the
set time and the motor may stall.
Setting 1: Enabled
Enables Stall Prevention during acceleration.
When the output current exceeds 85% of the level set in parameter L3-02, the acceleration rate is reduced. The acceleration
is stopped when the current exceeds L3-02. Acceleration continues when the current falls below L3-02. The Stall Prevention
level is automatically reduced in the field weakening area.
5.7 L: Protection Functions
114
YASKAWA ELECTRIC SIEP C710606 31B YASKAWA AC Drive – J1000 Technical Manual
http://nicontrols.com
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