(G) Control parameters
Parameters referred to
Pr. 14
Pr. 29
Pr. 71
Pr. 83
Pr. 84
Pr. 178 to Pr. 189
5.16.3
Load pattern selection
Optimal output characteristics (V/F characteristics) for application or load characteristics can be se-
lected.
Pr.
14
G003
Application for constant-torque load (Pr. 14 = "0", initial value)
● The output voltage will change linearly against the output frequency at the base frequency or
lower. (1.75th-power curve for FR-A820-01870(37K) or higher, and FR-A840-00930(37K) or higher)
● Set this parameter when driving a load that has constant load torque even when the rotation
speed is changed, such as conveyor, dolly, or roll drive.
NOTE
Select for constant-torque load (setting value "0") even for fan and pump in following cases.
● When accelerating a blower with large moment of inertia (J) in a short period of time.
● When it is a constant-torque load such as rotary pump or gear pump.
● When the load torque increases in low speed such as screw pump.
5 - 656
Load pattern selection
Acceleration/deceleration pattern selection
Applied motor
Rated motor voltage
Rated motor frequency
(input terminal function selection)
V/F
V/F
V/F
Name
Load pattern selection
100%
Pr. 3 Base frequency
Output frequency (Hz)
Initial
Setting
Description
value
range
0
For constant-torque load
1
For variable-torque load
For constant-torque lift
2
(boost at reverse rotation 0%)
For constant-torque lift
3
(boost at forward rotation 0%)
0
RT signal ON.................for constant-torque load
4
RT signal OFF ...............for constant-torque lift, boost at
RT signal ON.................for constant-torque load
5
RT signal OFF ...............for constant-torque lift, boost at
Fig. 5-324:
Constant-torque load
Parameters
=>
page 5-656
=>
page 5-240
=>
page 5-434
=>
page 5-67
=>
page 5-67
=>
page 5-422
reverse rotation 0%
forward rotation 0%
I002750E