11.9 L: Protection Function868 YASKAWA ELECTRIC SIEP C710617 01B YASKAWA AC Drive GA700 Technical ManualNote:Contact Yaskawa or your nearest sales representative for consultation before disabling this function at low speeds. Frequent operation ofdrives under conditions of high output current in low speed ranges may shorten the service life of the drive IGBT due to heat stress.0 : DisabledThe overload protection level is not reduced.1 : EnabledThe overload protection level is automatically reduced when oL2 is detected during low speed operation.At zero speed, the overload is derated by 50%.■ L8-18: Software Current Limit SelectionNo.(Hex.) Name Description Default Setting(Range)L8-18(04BE)Software CurrentLimit Selection Enables or disables the software current limit selection used to protect themain circuit transistor from significant current.0(0, 1)0 : DisabledThe output voltage is not limited when the output current reaches the software current limit value.Note:The drive may detect an oC [Overcurrent] when loads are particularly heavy or the acceleration time is particularly short.1 : EnabledThe drive reduces output voltage to reduce output current when the output current reaches the software currentlimit value.The drive starts normal operation when the output current lowers to the software current limit level.■ L8-19: FreqReductRateDuringOH Pre-AlarmNo.(Hex.) Name Description Default(Range)L8-19(04BF)FreqReductRateDuringOH Pre-Alarm Sets the ratio at which the frequency reference is derated when the oH alarmis output.0.8(0.1 to 0.9)Enabled when both of the following conditions are satisfied.• L8-03 = 4 [Overheat Pre-Alarm Ope Selection = Run@L8-19 Rate] is set• oH alarm is output■ L8-20: CF/STPo Fault Detection SelectNo.(Hex.) Name Description Default Setting(Range)L8-20(04C0)CF SELECTSelects the operation when CF faults are detectedwhen A1-02 = 4 [ControlMethod Selection = Advanced OpenLoop Vector Control].1(0 - 2)CF is detected when the state in which operation cannot be stopped continues even though the stop command hasbeen input.0 : Detection disabled1 : Detects CF [Control Fault], and then the drive coasts to stop.2 : Detects CF [Control Fault], and then the drive stops DC injection braking.The DC injection braking is stopped in accordance with the setting value of b2-03 [DC Inject Braking Time atStart].Note:• Control is unstable if the Rotational Auto-Tuning process is not executed when A1-02 = 4. In such cases, CF issues may be detectedwhen ramping to stop. If a CF fault is detected, check whether or not the Rotational Auto-Tuning process was executed. In addition,perform the Line-to-Line Resistance Tuning process.• Depending on load conditions, operation may not stop and CF issues may be detected if the stop command is input while the motor isrotating on the load side while using torque control via a setting of A1-02 = 4. Confirm that the Rotational Auto-Tuning and Line-to-Line Resistance Tuning processes were performed correctly and then set L8-20 = 0.V/f CL-V/f OLV CLV AOLV OLV/PMOLV/PM AOLV/PM CLV/PM EZOLVV/f CL-V/f OLV CLV AOLV OLV/PMOLV/PM AOLV/PM CLV/PM EZOLVV/f CL-V/f OLV CLV AOLV OLV/PMOLV/PM AOLV/PM CLV/PM EZOLV
