n L2-27: Power Supply Frequency Fault Detection WidthSets the frequency width used to detect a power supply frequency fault (Fdv) in Hz. There is normally no need to change thisparameter from the default value.No. Name Setting Range DefaultL2-27 Power Supply Frequency Fault Detection Width 3.0 to 20.0 Hz 6.0 Hzu L3: Stall PreventionThe motor may experience excessive slip because it cannot keep up with the frequency reference when the load is too high oracceleration and deceleration times are too short. If the motor slips during acceleration, it usually causes an overcurrent fault(oC), drive overload (oL2), or motor overload (oL1). If the motor slips during deceleration, it can cause excessive regenerativepower to flow back into the DC bus capacitors, and eventually cause the drive to fault out from overvoltage (ov). The StallPrevention Function prevents the motor from stalling and while allowing the motor to reach the desired speed without requiringthe user to change the acceleration or deceleration time settings. The Stall Prevention function can be set separately foracceleration, operating at constant speeds, and deceleration.n L3-01: Stall Prevention Selection during AccelerationStall Prevention during acceleration prevents tripping with overcurrent (oC), motor overload (oL1), or drive overload (oL2)faults common when accelerating with heavy loads.L3-01 determines the type of Stall prevention the drive should use during acceleration.No. Name Setting Range DefaultL3-01 Stall Prevention Selection during Acceleration 0, 1, 3 <1> 1<1> Setting 3 is not available for OLV/PM.Setting 0: DisabledNo Stall Prevention is provided. If the acceleration time is too short, the drive may not be able to get the motor up to speedfast enough, causing an overload fault.Setting 1: EnabledEnables Stall Prevention during acceleration. Operation varies depending on the control mode.• V/f Control, V/f Control with PG, and Open Loop Vector Control:Acceleration is reduced when the output current value exceeds 85% of the level set to parameter L3-02 for a longer than thetime set to L3-27. The acceleration stops when the current exceeds L3-02. Acceleration continues when the current fallsbelow L3-02 for longer than the time set to L3-27.The Stall Prevention level is automatically reduced in the constant power range. Refer to L3-03: Stall Prevention Limitduring Acceleration on page 113.1.8 L: Protection FunctionsYASKAWA ELECTRIC SIEP C710636 10C Z1000U HVAC MATRIX Drive Programming Manual 1111 Parameter Details
