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PARAMETERS
5
V/F pattern
5.6.2 Load pattern selection (Pr. 14)
The above parameters can be set when Pr. 160 User group read selection = "0". (Refer to page 167)
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%)
(1) Constant-torque load application (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.
(2) Variable-torque load application (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.
(3) Constant-torque load application
(setting "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. Pr. 46 Second
torque boost is valid when the RT signal turns
ON.
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.
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 constant-torque load (setting "0") in any of the following cases.
When a blower of large inertia moment (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
For vertical lift loads
At forward rotation boost...
Pr. 0 (Pr. 46)
setting
At reverse rotation boost...0%
100%
Output voltage
Base frequency
Output frequency (Hz)
Reverse
rotation
Forward
rotation
Pr. 0
Pr. 46
Pr. 14 = 2
For vertical lift loads
At forward rotation boost...0%
At reverse rotation boost...Pr. 0 (Pr. 46)
setting
100%
Output voltage
Base frequency
Output frequency (Hz)
Forward
rotation
Reverse
rotation
Pr. 0
Pr. 46
Pr. 14 = 3