B.9 L: Protection FunctionL parameters provide protection to the drive and motor, including control during momentary power loss, stall prevention,frequency detection, fault restarts, overtorque and undertorque detection, and other types of hardware protection.u L1: Motor ProtectionNo.(Addr.Hex) Name Description Values PageL1-01(480)Motor Overload ProtectionSelectionMtr OL Charact0: Disabled 0: OL1 Disabled1: General purpose motor 1: VT Motor(standard fan cooled)The drive may not be able to provide protection when using multiple motors,even if overload is enabled in L1-01. Set L1-01 to 0 and install separate thermalrelays to each motor.Default: 1Range: 0, 1 168L1-02(481)Motor Overload ProtectionTimeMOL Time ConstSets the motor thermal overload protection (oL1) time. Default: 1.0 minMin.: 0.1Max.: 5.0 169u L2: Momentary Power Loss Ride-ThruNo.(Addr.Hex) Name Description Values PageL2-01(485)Momentary Power LossOperation SelectionPwrL Selection0: Disabled. 0: DisabledDrive trips on Uv1 fault when power is lost.1: Recover within the time set in L2-02. 1: Enbl with TimerUv1 will be detected if power loss is longer than L2-02.Note: L2-02 is dependent on drive model selection and is notaccessible.2: Recover as long as CPU has power. 2: Enbl whl CPU actUv1 is not detected.Default: 2 <1>Range: 0 to 2 169L2-02(486)Momentary Power LossRide-Thru TimePwrL Ridethru tSets the Power Loss Ride-Thru time. Enabled only when L2-01 = 1 or 3. Default: <2>Min.: 0.0 sMax.: 25.5 s170L2-03(487)Momentary Power LossMinimum Baseblock TimePwrL Baseblock tSets the minimum wait time for residual motor voltage decay before the driveoutput reenergizes after performing Power Loss Ride-Thru.Increasing the time set to L2-03 may help if overcurrent or overvoltage occurduring Speed Search or during DC Injection Braking.Default: <2>Min.: 0.1 sMax.: 5.0 s170L2-05(489)Undervoltage DetectionLevel (Uv1)PUV Det LevelSets the DC bus undervoltage trip level. Default: 190 Vdc<3> <4>Min.: 150 VdcMax.: 220 Vdc <4>170<1> Default is 0 in bypass controller software versions VST800297 and earlier.<2> Default setting is dependent on parameter o2-04, Drive Model Selection.<3> Default setting is dependent on parameters o2-04, Drive Model Selection, and E1-01, Input Voltage Setting.<4> Values shown are specific to 208 Vac. Double the value for 480 Vac.u L3: Stall PreventionNo.(Addr.Hex) Name Description Values PageL3-02(490)Stall Prevention Levelduring AccelerationStallP Accel LvlUsed when L3-01 = 1 or 2. 100% is equal to the drive rated current. Default: <1>Min.: 0%Max.: 150% <1>170L3-03(491)Stall Prevention Limitduring AccelerationStallPAcc LowLimSets Stall Prevention lower limit during acceleration when operating in theconstant power range. Set as a percentage of drive rated current. Default: 50%Min.: 0Max.: 100 171B.9 L: Protection Function328 YASKAWA ELECTRIC SIEP YAIZ1B 01E YASKAWA AC Drive – Z1000 Bypass Technical Manual
