YASKAWA CIMR-AC2B0004 Quick Start Manual page 24

5 Modification from Standard Software
New and modified Software Functions
Carrier Frequency
• The carrier frequency upper limit changed from 15.0kHz to 12.5kHz (10.0kHz in PM control)
• The carrier frequency selection parameter (C6-02) is not available.
A1-02
Control Method
0
5
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 following diagram.
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 following diagram.
The parameter S1-01 is added to enable/disable On-Delay Compensation manually.
EN 24
C6-02
Carrier Frequency Selection
not available
C4-01
0
120 Hz
1.00
0
120 Hz
C6-03
Carrier Frequency Upper Carrier Frequency Lower
Limit
12.5
10.0
Frequency
160 Hz
Frequency
160 Hz
YASKAWA ELECTRIC TOEP C710606 48A - AC Drive A1000 1000Hz Software - Quick Start Guide
C6-04
Carrier Frequency
Limit
1.1
not available
Output
(Fout)
Output
(Fout)
C6-05
Proportional Gain
24
not available