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

Motor brake and stop operation4.14.4 Brake sequence function (Pr. 278 to Pr. 285, Pr. 292)Magnetic fluxSensorlessVectorThis function is used to output from the inverter the mechanical brake operation timing signal in vertical lift andother applications.This function prevents the load from dropping with gravity at a start due to the operation timing error of themechanical brake or an overcurrent alarm from occurring at a stop, ensuring secure operation.ParameterNumberName*1 When exercising vector control with the FR-A7AP, this parameter changes to speed deviation excess detection frequency (For details, refer topage 100)InitialValueSettingRange278 Brake opening frequency 3Hz 0 to 30Hz279 Brake opening current 130% 0 to 220%280Brake opening currentdetection time281 Brake operation time at start 0.3s 0 to 5s282 Brake operation frequency 6Hz 0 to 30Hz283 Brake operation time at stop 0.3s 0 to 5s284285292Deceleration detectionfunction selectionOverspeed detectionfrequency *1Automatic acceleration/decelerationDescriptionSet to the rated slip frequency of the motor + about 1.0Hz.This parameter may be only set if Pr. 278 ≤ Pr. 282.Generally, set this parameter to about 50 to 90%. If the settingis too low, the load is liable to drop due to gravity at start.Suppose that the rated inverter current is 100%.0.3s 0 to 2s Generally, set this parameter to about 0.1 to 0.3s.099990Set the mechanical delay time until the brake is loosened.Set the mechanical delay time until the brake is loosened +about 0.1 to 0.2s when Pr. 292 = "8".Set the frequency to activate the mechanical brake by turningoff the brake opening request signal (BOF). Generally, set thisparameter to the Pr. 278 setting + 3 to 4Hz.Setting is enabled only when Pr. 282 ≥ Pr. 278.Set the mechanical delay time until the brake is closed + 0.1swhen Pr. 292=7.Set the mechanical delay time until the brake is closed + 0.2to 0.3s when Pr. 292 = 8.0 Deceleration is not detected.1If deceleration is not normal during deceleration operation, theinverter fault is provided.If (detected frequency) - (output frequency) ≥ Pr. 285 during0 to 30Hz encoder feedback control, the inverter fault (E.MB1) isprovided.9999 Overspeed is not detected.0 Normal operation mode3 Optimum acceleration/deceleration mode (Refer to page 163)5, 6 Elevator mode (Refer to page 146)7 Brake sequence mode 18 Brake sequence mode 211 Shortest acceleration/deceleration mode (Refer to page 162)Sink logicPr.184 = 15Pr.190 = 20PowersupplyMCCBStart signalMulti-speed signalBrake opening completion signal(BRI)R/L1S/L2T/L3STFRHMCUVW*2RUN(BOF)AU(BRI) *1SD SE*3MechanicalbrakeMCMotor24VDCBrake opening requestsignal (BOF)*1 The input signal terminal used differsaccording to the Pr. 178 to Pr. 189settings.*2 The output signal terminal used differsaccording to the Pr. 190 to Pr. 196settings.*3 The current should be within thepermissible current of transistor in theinverter. (24V 0.1ADC)⋅⋅⋅CAUTIONWhen brake sequence mode is selected, automatic restart after instantaneous power failure is invalid.When using this function, set the acceleration time to 1s or longer.Changing the terminal function using any of Pr. 178 to Pr. 189, Pr. 190 to Pr. 196 may affect the other functions.Please make setting after confirming the function of each terminal.192