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

Motor brake and stop operationWhen Pr. 11 = "0.1 to 10s"Output frequency (Hz)DC injectionbrakevoltagePr.12OperationvoltagePr. 10 OperationfrequencyTimeTimePr. 11 Operation time(1) Operation frequency setting (Pr. 10)⋅ When the frequency at which the DC injection brake (zero speed control,servo lock) operates is set in Pr. 10, the DC voltage is applied to the motorwhen this frequency is reached during deceleration.⋅ At the Pr. 10 setting of "9999", the DC injection brake (zero speed control,servo lock) is applied to the motor when deceleration is made to thefrequency set in Pr. 13 Starting frequency.REMARKS⋅ Performing pre-excitation (zero speed control) under real sensorless vectormay cause motor vibration, etc. at deceleration to stop. To prevent this, setPr.10 DC injection brake operation frequency to 0.5Hz or less.⋅ The initial value of Pr. 10 automatically changes to 0.5Hz during vector control.When Pr. 11 = "8888"Pr. 12DC injectionbrakevoltageX13 signal(3) Operation voltage (torque) setting (Pr. 12)⋅⋅Output frequency(Hz)STF(2) Operation time setting (X13 signal, Pr. 11)⋅ Use Pr. 11 to set the duration period the DC injection brake (zero speedcontrol, servo lock) is applied.⋅ When the motor does not stop due to large load moment (J), increasing thesetting produces an effect.⋅ When Pr. 11 = "0s", the DC injection brake (zero speed control, servo lock)is not operated. (At a stop, the motor coasts.)⋅ When Pr. 11 = "8888", the DC injection brake (zero speed control, servolock) is applied when X13 signal is turned on.⋅ For the terminal used for X13 signal input, set "13" in any of Pr. 178 to Pr.189 to assign the function. (Refer to page 206)REMARKS⋅ Use Pr. 12 to set the percentage to the power supply voltage. (This parameter is not used during zero speed controlor servo lock.)⋅ When Pr. 12 = "0%", the DC injection brake is not operated. (At a stop, the motor coasts.)⋅ When using the constant-torque motor (SF-JRCA) and energy saving motor (SF-HR, SF-HRCA), change the Pr. 12setting as follows.SF-JRCA: 3.7K or less ...4%, 5.5K or more...2%SF-HR, SF-HRCA: 5.5K and 7.5K...3%, 11K or more...2%REMARKSONONTimeTimeON OFF⋅ When the X13 signal is turned on with Pr. 11 = "8888", zero speed control isactivated regardless of setting of Pr. 850 Brake operation selection.⋅ Under vector control, zero speed control or servo lock is activated dependingon the Pr. 802 setting.For the 5.5K and 7.5K, when the Pr. 12 setting is as below, changing the Pr. 71 Applied motor setting changes the Pr. 12 settingautomatically, it is not necessary to change the Pr. 12 setting.(a)When Pr. 12 is 4% (initial value)The Pr. 12 setting is automatically changed to 2% if the Pr. 71 value is changed from the value selecting the standard motor(0, 2 to 8, 40, 43, 44) to the value selecting the constant torque motor (1, 13 to 18, 50, 53, 54).(b)When Pr. 12 is 2%The Pr. 12 setting is automatically changed to 4% (initial value) if the Pr. 71 value is changed from the value selecting theconstant torque motor (1, 13 to 18, 50, 53, 54) to the value selecting the standard motor (0, 2 to 8, 40, 43, 44).Even if the Pr. 12 setting is increased, braking torque is limited so that the output current is within the rated inverter current.(4) Brake operation selection during real sensorless vector control (Pr. 850)⋅ You can select DC injection brake (initial value) or zero speed control for brake operation during real sensorlessvector control.When Pr. 850 = "1", zero speed control is exercised when the frequency reaches or decreases below the frequencyset in Pr. 10.REMARKS⋅ When the X13 signal is on with Pr. 11 = "8888", zero speed control is activated regardless of setting of Pr. 850 Brake operationselection.⋅ When restarting from brake operation during real sensorless vector control, set "1" (zero speed control) in Pr. 850. When thesetting value is "0" (DC injection brake), it may take approx. 2s until frequency is actually output from when the start commandis input.186