4.1 Test Run
4-7
Chapter 4 OPERATION
Performance comparison for drive controls (summary)
Each drive control has advantages and disadvantages. The table below compares the drive controls,
showing their relative performance in each characteristic. Select the one that shows high performance in
the characteristics that are important in your machinery. In rare cases, the performance shown below may
not be obtained due to various conditions including motor characteristics or mechanical rigidity. The final
performance should be determined by adjusting the speed control system or other elements with the
inverter being connected to the machinery (load). If you have any questions, contact your Fuji Electric
representative.
Table 4.1-5
F42
*
data
Drive control
Output
frequency
stability
Speed
control
accuracy
Speed
control
response
Maximum
torque
Load
disturba
nce
Current
control
Torque
accuracy
0
V/f control with slip
compensation inactive
~ – – ~ – – U
1
Dynamic torque vector
control
U U U ~ U – |
2
V/f control with slip
compensation active
U ▲ ▲ ~ U – U
3
V/f control with speed
sensor
U ~ | ~ U – U
4
Dynamic torque vector
control with speed
sensor
U ~ | ~ U – |
5
Vector control without
speed sensor
U | | U | ~ |
6
Vector control with
speed sensor
U ~ ~ U ~ ~ ~
Relative performance symbols ~: Excellent |: Good U: Effective ▲: Less effective -: Not effective
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