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

Set V/F pattern4.10.2 Load pattern selection (Pr. 14)V/FYou can select the optimum output characteristic (V/F characteristic) for the application and load characteristics.ParameterNumberName Initial Value Setting Range Description14 Load pattern selection 00 For constant torque load1 For reduced-torque load2345For constant torque elevators(at reverse rotation boost of 0%)For constant torque elevators(at forward rotation boost of 0%)RT signal on ...for constant torque loadRT signal off ...for constant torqueelevators at reverse rotation boost of 0%RT signal on ...for constant torque loadRT signal off ...for constant torqueelevators at forward rotation boost of 0%Pr.14=0100%Output voltagePr.14=1100%Output voltagePr.14=2Pr.3 Base frequencyOutput frequency (Hz)Pr.3 Base frequencyOutput frequency (Hz)For vertical lift loadsAt forward rotation boost...Pr.0 settingAt reverse rotation boost...0%100%OutputvoltagePr.0ForwardrotationReverserotationBase frequencyOutput frequency (Hz)(1) For constant-torque load (setting "0", initial value)⋅ At or less than the base frequency, the output voltage varies linearly with the outputfrequency.⋅ Set this value when driving the load whose load torque is constant even if the speedvaries, e.g. conveyor, cart or roll drive.POINTIf the load is a fan or pump, select "for rated torque load (setting "0")" in any of thefollowing cases.⋅ When a blower of large moment of inertia (J) is accelerated in a short time⋅ For constant-torque load such as rotary pump or gear pump⋅ When load torque increases at low speed, e.g. screw pump(2) For variable-torque load (setting "1")⋅ At or less than the base frequency, the output voltage varies with the output frequencyin a square curve.⋅ Set this value when driving the load whose load torque varies in proportion to thesquare of the speed, e.g. fan or pump.Pr.14=3For vertical lift loadsAt forward rotation boost...0%At reverse rotation boost...Pr.0 setting100%OutputvoltagePr.0ReverserotationForwardrotationBase frequencyOutput frequency (Hz)(3) Vertical lift load applications (settingvalues "2, 3")⋅⋅⋅Set "2" when a vertical lift load is fixed as power drivingload at forward rotation and regenerative load atreverse rotation.Pr. 0 Torque boost is valid during forward rotation andtorque boost is automatically changed to "0%" duringreverse rotation.Set "3" for an elevated load that is in the driving modeduring reverse rotation and in the regenerative loadmode during forward rotation according to the loadweight, e.g. counterweight system.REMARKS⋅ When torque is continuously regenerated as vertical lift load, itis effective to set the rated voltage in Pr. 19 Base frequencyvoltage to prevent trip due to current at regeneration.144