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

Special operation and frequency control4.25.3 Load torque high speed frequency control (Pr. 4, Pr. 5, Pr. 270 to Pr. 274)Load torque high speed frequency control is a functionwhich automatically sets the operational maximumfrequency according to the load.More specifically, the magnitude of the load is judgedaccording to the average current at a certain time afterstarting to perform operation at higher than the presetfrequency under light load.This function is designed to increase speedautomatically under light load, for example to minimizethe incoming/outgoing time in a multi-story parking lot.Whether there is a load ornot, the lift is movedvertically at the same speed.LightFasterThe lift with a light load or withouta load is moved faster than the liftwith a load.(The output frequency is increased.)ParameterNumber45270271272NameMulti-speed setting (highspeed)Multi-speed setting (middlespeed)Stop-on contact/loadtorque high-speedfrequency controlselectionHigh-speed settingmaximum currentMiddle-speed settingminimum currentInitialValue273 Current averaging range 9999274Current averaging filtertime constantSettingRangeDescription60Hz 0 to 400Hz Set the higher-speed frequency.30Hz 0 to 400Hz Set the lower-speed frequency.00 Normal operation1 Stop-on-control (refer to page 189)2 Load torque high speed frequency control3Stop-on-contact (refer to page 189) + load torque highspeed frequency control50% 0 to 220% Set the upper and lower limits of the current at high and100% 0 to 220%middle speeds.0 to 400Hz999916 1 to 4000Average current during acceleration from (Pr. 273 × 1/2)Hz to (Pr. 273) Hz can be achieved.Average current during acceleration from (Pr. 5 × 1/2) Hzto (Pr. 5) Hz is achieved.Set the time constant of the primary delay filter relative tothe output current.The time constant [ms] is 0.75 × Pr. 274 and the initialvalue is 12ms.A larger setting provides higher stability but poorer response.Sink logicMCPr. 186 = 19MechanicalbrakeMCCBPower supplyR/L1S/L2T/L3UVWMotorStart signalSTFLoad torque high-speed frequency CS(X19)*SD* The used terminal changes according to the Pr. 180 to Pr. 189 (input terminal function selection) settings.342