Toshiba TOSVERT VF-S15 Instruction Manual

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E6581871６3.2.1 Automatic setting mode of high-speed operation speed(f328=1, 2)The diagram on the next page (Fig.1) is the timing chart when the automatic setting mode of high-speedoperation speed (f328=1) is applied to lift application.At the operation frequency of the light-load high-speed operation switching lower limit frequency (f331)or more (point A in the Fig.1), if a detected torque (*1) after reaching the set speed is the switching loadtorque during power running (f335 setting value) or less, the inverter judges that the load is light.For light-load operation, the frequency decided with the following formula is determined as a targetfrequency (high-speed operation frequency) and the operation is accelerated toward the target frequency.(Point B in the Fig.1 Light-load high-speed operation)Target frequency = (Value set with f335) × [Base frequency (vl)] / (The detected torque)when target frequency ≦ ul (≦ fh)(*1) Average torque during light-load high-speed operation load detection time (f333) after light-loadhigh-speed operation load detection waiting time (f332) (5% or more)Light-load detection is carried out after reaching the set speed and when an operation frequency is thelight-load high-speed operation switching lower limit frequency (f331) or more.When reaching the conditions below, the light-load high-speed operation is canceled and the operation isreturned to the operation at the frequency of speed command value.1) The detected torque exceed the following the judgment value during acceleration up to thehigh-speed operation frequency.The detected torque (*1) + (Heavy-load torque during power running (f336) – Switching loadtorque during power running(f335)(0% or more) )2) The detected torque exceed the following the judgment value after reaching the target frequencyand after a lapse of the light-load high-speed operation heavy load detection time (f334).The detected torque (*1) + (Heavy-load torque during constant power running (f337) –Switching load torque during power running (f335) (0% or more))3) The speed command value under the light-load high-speed operation switching lower limit frequency(f331) is entered.4) The Light-load high-speed operation prohibitive signal is ON.