Load Pattern Selection (Pr. 14) - Mitsubishi Electric FR-D720 K Series Instruction Manual

V/F pattern
4.5.2

Load pattern selection (Pr. 14)

Optimum output characteristic (V/F characteristic) for the application and load characteristics can be selected.
Parameter
Number
14 Load pattern selection
The above parameters can be set when Pr. 160 Extended function display selection = "0". (Refer to page 165.)
Pr. 14 = 0
100%
Pr. 3 Base frequency
Output frequency (Hz)
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

Pr. 14 = 1
100%
Pr. 3 Base frequency
Output frequency (Hz)
90
Name Initial Value
(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.
V/F V/F V/F
Setting Range
0
1
0 2
3
Description
For constant-torque load
For variable-torque load
For constant-torque elevators
(at reverse rotation boost of 0%)
For constant-torque elevators
(at forward rotation boost of 0%)