Mitsubishi Electric FR-A800 Series Instruction Manual page 710

 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 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. (1.75th-power
curve for the FR-A820-01870(37K) or higher, and the FR-A840-00930(37K) or higher)
• 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.
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Pr.14 = 2
For vertical lift loads
At forward rotation boost...Pr.0 setting
At reverse rotation boost...0%
100%
Forward
rotation
Reverse
Pr.0 rotation
Base frequency
Output frequency (Hz)
search engine
Pr.14 = 0
100%
Pr. 3 Base frequency
Output frequency (Hz)
Pr.14 = 1
100%
Pr. 3 Base frequency
Output frequency (Hz)
Pr.14 = 3
For vertical lift loads
At forward rotation boost...0%
At reverse rotation boost...Pr.0 setting
100%
Reverse
rotation
Pr.0
Output frequency (Hz)
Forward
rotation
Base frequency
5. PARAMETERS
5.16 (G) Control parameters
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