Omron 3G3JX

4-13
4-2 Function Mode
4
Functions
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.
Special Reduced Torque Characteristics (Special VP)
•Suitable for a fan or pump that requires torque in a low speed range. These have VC
characteristics only for low deceleration in reduced torque characteristics.
Period a: Provides constant torque characteristics (VC) within a range from 0 Hz to 10% of the base
frequency.
(Example) If the base frequency is 60 Hz, the Inverter provides constant torque
characteristics within a range from 0 to 6 Hz.
Period b: Provides reduced torque characteristics within a range from 10% to 100% of the base
frequency.
The Inverter outputs voltage based on a curve of the 1.7th power of the frequency.
Period c: Provides constant voltage within a range from the base frequency to the maximum
frequency.
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)
0
Output
voltage
(100%)
Base frequency
(A003/A203)
Output
frequency (Hz)
Max. frequency
(A004/A204)
VC
VP
(1.7th power)
10% of base
frequency
ab c