Load Pattern Selection (Pr. 14) - Mitsubishi Electric FR-A700 Instruction Manual

4.10.2 Load pattern selection (Pr. 14)

You can select the optimum output characteristic (V/F characteristic) for the application and load characteristics.
Parameter
Name
Number
14 Load pattern selection
Pr.14=0
100%
Pr.3 Base frequency
Output frequency (Hz)
Pr.14=1
100%
Pr.3 Base frequency
Output frequency (Hz)
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)
V/F V/F V/F
Initial Value
0
(1) For constant-torque load (setting "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.
POINT
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
(2) For variable-torque load (setting "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.
Pr.14=3
For vertical lift loads
At forward rotation boost...0%
At reverse rotation boost...Pr.0 setting
100%
Reverse
rotation
Forward
Pr.0 rotation
Base frequency
Output frequency (Hz)
Setting Range
0 For constant torque load
1 For reduced-torque load
For constant torque elevators
2
(at reverse rotation boost of 0%)
For constant torque elevators
3
(at forward rotation boost of 0%)
RT signal on ...for constant torque load
4 RT signal off ...for constant torque
elevators at reverse rotation boost of 0%
RT signal on ...for constant torque load
5 RT signal off ...for constant torque
elevators at forward rotation boost of 0%
(3) Vertical lift load applications (setting
values "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.
REMARKS
⋅ 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.
Set V/F pattern
Description
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