Load Pattern Selection (Pr. 14) - Mitsubishi Electric FR-D720S SC EC Instruction Manual

Set V/f pattern
6.4.2

Load pattern selection (Pr. 14)

You can select the optimum output characteristic (V/f characteristic) for the application and load
characteristics.
Pr.
Name
No.
14
Load pattern selection
The above parameter can be set when Pr. 160 = 0.
For constant-torque load (Pr. 14 = 0, initial value)
At or less than the base frequency voltage, the output voltage varies linearly with the output fre-
quency. Set this value when driving the load whose load torque is constant if the speed varies,
e.g. conveyor, cart or roll drive.
100
For variable-torque load (Pr. 14 = 1)
At or less than the base frequency voltage, 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.
100
6 - 46
Initial
Setting Range Description
Value
0
1
0 2
3
[ % ]
Pr. 3 Base frequency
Output frequency
[ % ]
Pr. 3 Base frequency
Output frequency
V/F V/F V/F
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%)
Fig. 6-12:
Constant-torque load
Hz
Fig. 6-13:
Variable-torque load
Hz
Parameter
Parameters referred to
0 Torque boost
46 Second torque
boost
3 Base frequency
178–182 Input terminal func-
tion selection
General-purpose
magnetic flux vec-
tor control
Refer to
Section
6.2.1
6.2.1
6.4.1
6.9.1
6.2.2
I001322C
I001323C