4-15
4-2 Function Mode
4
Functions
Relation Between Torque Boost and V/f Characteristics
Determine the relation of output voltage against output frequency.
* To switch to the 2nd control, allocate 08 (SET) to the multi-function input terminal and then turn it on.
Control Method (V/f Characteristics)
Constant Torque Characteristics (VC)
•Ouput voltage is proportional to output frequency.
While proportional from 0 Hz to base frequency, the output voltage is constant from base to
maximum frequencies regardless of the frequency.
Reduced Torque Characteristics (VP 1.7th power)
•Suitable for a fan or pump that does not require large torque in a low speed range.
These provide high efficiency, reduced noise and vibration, owing to reduced output voltage in a
low speed range.
Parameter No. Function name Data Default setting Unit
A041 Torque boost selection
00: Manual torque boost
01: Automatic (simple) torque boost
00 ⎯
*
A241 2nd torque boost selection
A042 Manual torque boost voltage
0.0 to 20.0
(Ratio to the value of AVR voltage
selection A082)
5.0
%
*
A242 2nd manual torque boost voltage 0.0
A043 Manual torque boost frequency
0.0 to 50.0
(Ratio to base frequency)
2.5
%
*
A243
2nd manual torque boost
frequency
0.0
A044 V/f characteristics selection
00: Constant torque characteristics
(VC)
01: Reduced torque characteristics
(VP 1.7th power)
06: Special reduced torque
characteristics (Special VP)
00 ⎯
*
A244 2nd V/f characteristics selection
A045 Output voltage gain
20. to 100. 100. %
A245 2nd output voltage gain
Related parameters A082, H003/H203, H004/H204
0
Output
voltage
(100%)
Base frequency
(A003/A203)
Output
frequency (Hz)
Max. frequency
(A004/A204)
0
Output
voltage
(100%)
Base frequency
(A003/A203)
Output
frequency (Hz)
Max. frequency
(A004/A204)
VP (1.7th
power of VP)
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