Load Pattern Selection - Mitsubishi Electric FR-A820-00046 Instruction Manual

(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