Yaskawa AC Drive - A1000 Option Hz High Frequency Custom - Manual (Page 13)

5 Details for New and Modified Software Functions
YASKAWA TM.A1000SW.056 YASKAWA AC Drive - A1000 Custom Software Supplement 13
5 Details for New and Modified Software Functions
‹ Carrier Frequency
• The upper limit for the carrier frequency is 12.5 kHz for V/f Control, but changes to 10.0 kHz when using a PM motor.
• Carrier Frequency Upper limit will vary according to drive capacity.
• The lower limit for the Carrier Frequency is changed to 1.1.
• Parameter C6-02 Carrier Frequency is fixed to setting F.
Table 10 Carrier Frequency Selection Parameter (C6-02) Settings
‹ 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, consider decreasing torque compensation gain according to the output frequency as shown in
Figure 1 .
Figure 1
Figure 1 Torque Compensation Gain
‹ 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. By reducing voltage
level for On Delay Compensation according to the output frequency, the user can have On Delay Compensation be active
only during low frequencies as shown in
Figure 2 .
Figure 2 shows the gain added to On Delay Compensation voltage. Parameter S1-01 is used to enable and disable On
Delay Compensation.
Figure 2
Figure 2 On-Delay Compensation Gain
C6-02
Carrier Frequency
Selection
C6-03
Carrier Frequency
Upper Limit
C6-04
Carrier Frequency
Lower Limit
C6-05
Carrier Frequency
Proportional Gain
Note
F 10.0 1.1 24
Parameter table changes according to setting
value of C6-02.
C4-01
120 Hz
Output
Frequency
(Fout) 160 Hz 0
1.00
120 Hz
Output
Frequency
(Fout) 160 Hz 0