FR-A701 INSTRUCTION MANUAL (Applied) - Automation Systems ...

4PARAMETERSAdjust the output torque (current) of the motor4.8.4 Stall prevention operation (Pr. 22, Pr. 23, Pr. 48, Pr. 49, Pr. 66, Pr. 114, Pr. 115,Pr. 148, Pr. 149, Pr. 154, Pr. 156, Pr. 157, Pr. 858, Pr. 868)V/FMagnetic fluxThis function monitors the output current and automatically changes the output frequency to prevent the inverterfrom coming to trip due to overcurrent, overvoltage, etc. It can also limit stall prevention and fast responsecurrent limit operation during acceleration/deceleration, driving or regeneration. Invalid under real sensorlessvector control or vector control.• Stall preventionIf the output current exceeds the stall prevention operation level, the output frequency of the inverter isautomatically varied to reduce the output current.Also the second stall prevention function can restrict the output frequency range in which the stall preventionfunction is valid. (Pr. 49)• Fast response current limitIf the current exceeds the limit value, the output of the inverter is shut off to prevent an overcurrent.ParameterNumberPr. 22⋅⋅⋅2223484966114115148149154156NameStall prevention operationlevelStall prevention operationlevel compensation factorat double speedSecond stall preventionoperation currentSecond stall preventionoperation frequencyStall prevention operationreduction starting frequencyThird stall preventionoperation currentThird stall preventionoperation frequencyStall prevention level at 0VinputStall prevention level at10V inputVoltage reductionselection during stallprevention operationStall prevention operationselectionInitial Value150%9999150%0Hz60Hz150%0HzSettingRangeDescription0 Stall prevention operation selection becomes invalid.0.1 to 400%Set the current value at which stall preventionoperation will be started.0 to 200%The stall operation level can be reduced whenoperating at a high speed above the rated frequency.9999 Constant according to Pr. 220 Second stall prevention operation invalid0.1 to 220%The second stall prevention operation level can beset.0 Second stall prevention operation invalid0.01 to 400HzSet the frequency at which stall prevention operationof Pr. 48 is started.9999 Pr. 48 is valid when the RT signal is on.0 to 400HzSet the frequency at which the stall operation level isstarted to reduce.0 Third stall prevention operation invalid0.1 to 220%Stall prevention operation level can be changed withthe X9 signal.0 Third stall prevention operation invalid0.01 to 400HzSet the frequency at which stall prevention operationwhen the X9 signal is on starts.150% 0 to 220%200% 0 to 220%10010 to 31,100, 101Stall prevention operation level can be changed bythe analog signal input to terminal 1 (terminal 4).With voltageYou can select whether to usereductionoutput voltage reductionWithout voltage during stall preventionreductionoperation or not.You can select whether stall prevention operation andfast response current limit operation will be performedor not.Set the output start time of the OL signal output whenstall prevention is activated.157 OL signal output timer 0s0 to 25s9999 Without the OL signal output858Terminal 4 functionBy setting "4", the stall prevention operation level can0 0, 1, 4, 9999assignmentbe changed with a signal to terminal 4.868Terminal 1 functionBy setting "4", the stall prevention operation level can0 0 to 6, 9999assignmentbe changed with a signal to terminal 1.OLAccelerationConstantspeedOutput currentDecelerationStall prevention operation exampleOutput frequencyTime(1) Setting of stall prevention operation level (Pr. 22)⋅ Set in Pr. 22 the ratio of the output current to the rated inverter current atwhich stall prevention operation will be performed. Normally set 150%(initial value).⋅ Stall prevention operation stops acceleration (makes deceleration) duringacceleration, makes deceleration during constant speed, and stopsdeceleration during deceleration.⋅ When stall prevention operation is performed, the OL signal is output.CAUTIONIf an overload status lasts long, an inverter trip (e.g. electronic thermal relay function (E.THM)) may occur.When Pr. 156 has been set to activate the fast response current limit (initial setting), the Pr. 22 setting should not be higher than170%. The torque will not be developed by doing so.When real sensorless vector control or vector control is selected using Pr. 800 Control method selection, Pr.22 serves as torque limit level.135