Yaskawa 1000 Hz High Frequency Custom - Manual (Page 15)

5 New and Modified Software Functions
YASKAWA ELECTRIC TM.V1000SW.134A 1000 Hz High Frequency Custom Software Supplement 15
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Torque Compensation
High speed motors typically have very low impedance compared to standard 60/120 Hz
motors. These high speed/low impedance motors saturate easily and may cause hunting and
oscillation 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 and
eliminate voltage boost above 160 Hz as shown in Figure 2 .
Figure 2
Figure 2 Torque Compensation Gain
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On-Delay Compensation
High speed motors typically operate at low V/f ratios compared to standard 60/120 Hz
motors, and On-Delay Compensation settings may adversely affect the motor voltage and
cause hunting and oscillation. Therefore, On-Delay Compensation Gain is modified to
reduce its effectiveness above 120 Hz as shown in Figure 3 .
Note: When S1-01 = 0, On-Delay Compensation is disabled at all frequencies.
Figure 3
Figure 3 On-Delay Compensation Gain
C4-01
120 Hz
Output
Frequency
(Fout) 160 Hz 0
1.00
120 Hz
Output
Frequency
(Fout) 160 Hz
0