No. Name Setting Range DefaultL2-01 Momentary Power Loss Operation Selection 0 to 2 0Setting 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 LimitWhen a momentary power loss occurs, the drive will attempt to restart and perform Speed Search if power is restored withina certain period of time. If power is not restored within this time, then a Uv1 fault is triggered and the drive output will be shutoff. The allowable time for the momentary power loss condition is dependent on the drive capacity.Setting 2: Recover as Long as CPU has PowerDrive 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 closeas 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. Afault signal is not output at this time.u L3: Stall PreventionWhen the load is too high or acceleration and deceleration times are too short, the motor may be unable to keep up with thefrequency reference, resulting in excessive slip. This “stalling” makes it impossible to decelerate or accelerate. The drive canprevent the motor from stalling and still reach the desired speed without the user needing to change the acceleration ordeceleration 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 SelectionStall Prevention during acceleration is used when the motor loses speed during acceleration due to a relatively large load. Itprevents overcurrent and motor overload (oL1) from occurring.This parameter sets the Stall Prevention method for acceleration.No. Name Setting Range DefaultL3-01 Stall Prevention Selection during Acceleration 0 to 1 1Setting 0: DisabledNo Stall Prevention is provided. If the acceleration time setting is too short, the drive may not be able to accelerate within theset time and the motor may stall.Setting 1: EnabledEnables Stall Prevention during acceleration.When the output current exceeds 85% of the level set in parameter L3-02, the acceleration rate is reduced. The accelerationis stopped when the current exceeds L3-02. Acceleration continues when the current falls below L3-02. The Stall Preventionlevel is automatically reduced in the field weakening area.5.7 L: Protection Functions114 YASKAWA ELECTRIC SIEP C710606 31B YASKAWA AC Drive – J1000 Technical Manualhttp://nicontrols.com
