YASKAWA VU*B****AA*-134 Series Manual

Contents

5 New and Modified Software FunctionsYASKAWA ELECTRIC TM.V1000SW.134A 1000 Hz High Frequency Custom Software Supplement 15◆ Torque CompensationHigh speed motors typically have very low impedance compared to standard 60/120 Hzmotors. These high speed/low impedance motors saturate easily and may cause hunting andoscillation when a high V/f pattern is applied, especially at high frequencies. Therefore,Torque Compensation Gain (C4-01) is modified to limit voltage boost above 120 Hz andeliminate voltage boost above 160 Hz as shown in Figure 2.Figure 2Figure 2 Torque Compensation Gain◆ On-Delay CompensationHigh speed motors typically operate at low V/f ratios compared to standard 60/120 Hzmotors, and On-Delay Compensation settings may adversely affect the motor voltage andcause hunting and oscillation. Therefore, On-Delay Compensation Gain is modified toreduce its effectiveness above 120 Hz as shown in Figure 3.Note: When S1-01 = 0, On-Delay Compensation is disabled at all frequencies.Figure 3Figure 3 On-Delay Compensation GainC4-01120 HzOutputFrequency(Fout)160 Hz01.00120 HzOutputFrequency(Fout)160 Hz0