105
V/F pattern
4.6.2
Load pattern selection (Pr. 14)
The above parameters can be set when
Pr. 160 Extended function display selection
= "0".
Optimum output characteristic (V/F characteristic) for the application and load characteristics can be selected.
Parameter
Number
Name
Initial Value
Setting Range
Description
14
Load pattern selection
1
0
For constant-torque load
1
For variable-torque load
(1) Constant-torque load application (setting "0")
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", initial value)
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.
NOTE
Changing the terminal assignment using
Pr. 178 to Pr. 182 (input terminal function selection)
may affect the other
functions. Set parameters after confirming the function of each terminal.
Parameters referred to
Pr. 3 Base frequency
Pr. 178 to Pr. 182 (input terminal function selection)
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
REMARKS
When the RT signal is ON, the other second functions are also valid.
Содержание FR-F700PJ Series
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Страница 346: ...341 APPENDIX This chapter provides the APPENDIX of this product Always read the instructions before using the equipment ...