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

Torque control by real sensorless vectorcontrol, vector control4.5.2 Setting procedure of real sensorless vector control (torque control)SensorlessPerform secure wiring.(Refer to page 14.)Set the motor. (Pr. 71)(Refer to page 169.)Set "3" (standard motor) or "13" (constant torque motor) in Pr. 71Applied motor.Set the motor capacity and the number of motor poles. (Pr. 80, Pr. 81)(Refer to page 75.)Set the motor capacity (kW) in Pr. 80 Motor capacity and set thenumber of motor poles in Pr. 81 Number of motor poles.(V/F control is performed when the setting is "9999" (initial value).)Select a control method. (Refer to page 75)Set either "11" (torque control) or "12" (speed-torque switchover) inPr. 800 and make torque control valid.Set the torque command. (Pr. 804)(Refer to page 108.)Set the speed limit. (Pr. 807)(Refer to page 110.)Perform offline auto tuning. (Pr. 96)(Refer to page 171.)Test runAs required⋅ Select online auto tuning. (Pr. 95) (Refer to page 181.)⋅ Manual input torque control gain adjustment (Refer to page 113)⋅⋅⋅⋅⋅⋅⋅CAUTIONMake sure to perform offline auto tuning before performing real sensorless vector control.The carrier frequencies are selectable from among 2k, 6k, 10k, 14kHz for real sensorless vector control.Torque control can not be performed in the low speed (approx. 10Hz or less) regeneration range and with light load at low speed(approx. 20% or less of rated torque at approx. 5Hz or less). Choose vector control.Performing pre-excitation (LX signal and X13 signal) under torque control may start the motor running at a low speed even whenthe start command (STF or STR) is not input. The motor may run also at a low speed when the speed limit value = 0 with a startcommand input. Perform pre-excitation after making sure that there will be no problem in safety if the motor runs.Do not switch between the STF (forward rotation command) and STR (reverse rotation command) during operation under torquecontrol. Overcurrent trip (E.OC) or opposite rotation deceleration error (E.11) occurs.When the inverter is likely to start during motor coasting under real sensorless vector control, set to make frequency search ofautomatic restart after instantaneous power failure valid (Pr. 57 ≠ "9999", Pr. 162 = "10").Enough torque may not be generated in the ultra-low speed range less than approx. 2Hz when performing real sensorless vectorcontrol.The guideline of speed control range is as shown below.Driving: 1:200 (2, 4, 6 poles) Can be used at 0.3Hz or more at rated 60Hz1:30 (8, 10 poles) Can be used at 2Hz or more at rated 60HzRegeneration:1:12 (2 to 10 poles) Can be used at 5Hz or more at rated 60Hz106