Mitsubishi Electric FR-E800 Instruction Manual page 533

16.3
Load pattern selection
V/F V/F V/F
Optimal output characteristics (V/F characteristics) for application or load characteristics can be selected.
Pr.
14
Load pattern selection
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.
• 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.
Select for constant-torque load (setting value "0") even for fan and pump in the 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.
 Application for variable-torque load (Pr.14 ="1")
• The output voltage will change in square curve against the output frequency at the base frequency or lower.
• Set this parameter when driving a load with load torque change proportionally against the square of the rotation speed,
such as a fan or pump.
 Vertical lift load applications (Pr.14 = "2, 3")
• Set "2" when a vertical lift load is fixed as power driving load at forward rotation and regenerative load at reverse rotation.
• Pr.0 Torque boost is valid during forward rotation, and torque boost is automatically changed to "0%" during reverse
rotation.
• Set "3" for an elevated load that is in the driving mode during reverse rotation and in the regenerative load mode during
forward rotation according to the load weight, e.g. counterweight system.
532
16. (G) Control Parameters
16.3 Load pattern selection
Name Initial value
0
Setting
range
0 For constant-torque load
1 For variable-torque load
2 For constant-torque lift (boost at reverse rotation: 0%)
3 For constant-torque lift (boost at forward rotation: 0%)
Pr.14 = 0
100%
Pr. 3 Base frequency
Output frequency (Hz)
Pr.14 = 1
100%
Pr. 3 Base frequency
Output frequency (Hz)
Description