Set V/f pattern
Parameter
6 - 46
6.4.2
Load pattern selection (Pr. 14)
You can select the optimum output characteristic (V/f characteristic) for the application and load
characteristics.
The above parameter can be set when Pr. 160 = 0.
For constant-torque load (Pr. 14 = 0, initial value)
At or less than the base frequency voltage, the output voltage varies linearly with the output fre-
quency. Set this value when driving the load whose load torque is constant if the speed varies,
e.g. conveyor, cart or roll drive.
For variable-torque load (Pr. 14 = 1)
At or less than the base frequency voltage, the output voltage varies with the output frequency
in a square curve. Set this value when driving the load whose load torque varies in proportion
to the square of the speed, e.g. fan or pump.
Pr.
No.
Name
Initial
Value
Setting Range
Description
Parameters referred to
Refer to
Section
14
Load pattern selection
0
0
For constant torque load
0
46
3
178–182
Torque boost
Second torque
boost
Base frequency
Input terminal func-
tion selection
General-purpose
magnetic flux vec-
tor control
1
For variable torque load
2
For constant torque elevators
(at reverse rotation boost of
0%)
3
For constant torque elevators
(at forward rotation boost of
0%)
Fig. 6-12:
Constant-torque load
I001322C
Fig. 6-13:
Variable-torque load
I001323C
V/F
V/F
V/F
[%]
100
Hz
Pr. 3 Base frequency
Output frequency
Output v
o
ltage
[%]
100
Hz
Pr. 3 Base frequency
Output frequency
Output v
o
ltage
Summary of Contents for FR-D720S SC EC
Page 2: ......
Page 4: ......
Page 24: ...Description of the case Product checking and part identification 1 4 ...
Page 108: ...Operation panel Operation 4 20 ...
Page 436: ...Setting for the parameter unit and operation panel Parameter 6 286 ...
Page 484: ...Measurements on the main circuit Maintenance and inspection 8 14 ...
Page 504: ...Specification change Appendix A 20 ...
Page 505: ......
Page 506: ......
Page 510: ...Index Appendix A 24 ...
Page 511: ......