Mitsubishi Electronics FR-A700 Manual De Usuario

You can select the optimum output characteristic (V/F characteristic) for the application and load characteristics.

0

0

For constant torque load

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%)

4

RT signal ON..for constant torque load
RT signal OFF for constant torque 
elevators at reverse rotation boost of 0%

5

RT signal ON..for constant torque load
RT signal OFF for constant torque 
elevators at forward rotation boost of 0%

(1) For constant-torque load (Pr. 14 = "0", initial value)

⋅ At or less than the base frequency, the output voltage varies linearly with the output

frequency.

⋅ Set this value when driving the load whose load torque is constant even if the speed

varies, e.g. conveyor, cart or roll drive.

(2) For variable-torque load (Pr. 14 = "1")

⋅ At or less than the base frequency, 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.

(3) Vertical lift load applications (Pr. 14 = "2,

⋅ 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. 

 ⋅ When torque is continuously regenerated as vertical lift load, it

is effective to set the rated voltage in Pr. 19 Base frequency
voltage to prevent trip due to current at regeneration.

100%

Output voltage

Pr.3 Base frequency

Output frequency (Hz)

Pr.14=0

If the load is a fan or pump, select "for rated torque load (setting "0")" in any of the
following cases.

⋅ When a blower of large moment of inertia (J) is accelerated in a short time

⋅ For constant-torque load such as rotary pump or gear pump

⋅ When load torque increases at low speed, e.g. screw pump

100%

Output voltage

Output frequency (Hz)

Pr.14=1

100%

Forward 
rotation

Output

 voltage

 Base frequency

Output frequency (Hz)

For vertical lift loads
At forward rotation boost...Pr.0 setting
At reverse rotation boost...0%

Reverse 
rotation

Pr.14=2

100%

Reverse 
rotation

Output

 voltage

 Base frequency

Output frequency (Hz)

For vertical lift loads
At forward rotation boost...0%
At reverse rotation boost...Pr.0 setting

Forward 
rotation

Pr.14=3