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V/F pattern
4
PARAMETERS
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
Number
Name Initial Value Setting Range Description
14 Load pattern selection 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 OFFfor constant torque
elevators at reverse rotation boost of 0%
5
RT signal ON..for constant torque load
RT signal OFFfor 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,
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.
V/F
V/F
V/F
100%
Output voltage
Pr.3 Base frequency
Output frequency (Hz)
Pr.14=0
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
100%
Output voltage
Pr.3 Base frequency
Output frequency (Hz)
Pr.14=1
100%
Forward
rotation
Pr.0
Output
voltage
Base frequency
Output frequency (Hz)
For vertical lift loads
A
t forward rotation boost...Pr.0 setting
A
t reverse rotation boost...0%
Reverse
rotation
Pr.14=2
100%
Reverse
rotation
Pr.0
Output
voltage
Base frequency
Output frequency (Hz)
For vertical lift loads
A
t forward rotation boost...0%
A
t reverse rotation boost...Pr.0 setting
Forward
rotation
Pr.14=3