n10
Setting range n11
Setting range n12
Setting range n13
Setting range n14
Setting range n15
Setting range
V/f Control
Chapter 5-2
5-2 V/f Control
Setting the V/f Patterns (n09 to n15)
• Set the V/f pattern so that the motor output torque is adjusted to the required load torque.
• The J7AZ incorporates an automatic torque boost function. Therefore, a maximum of 150% torque can be output at 3 Hz without changing the default settings. Check the system in trial operation and leave the default settings as they are if no torque characteristic changes are required.
n09 No
Setting range
50.0 to 400 Hz
Maximum Frequency (FMAX)
Unit of setting
0.1 Hz
(see note 1)
Changes during operation
Default setting 60.0
1 to 255 (V)
(see note 2)
Maximum Voltage (VMAX)
Unit of setting
1 V
Changes during operation
Default setting
No
200
(see note 2)
No Maximum Voltage Frequency (FA)
0.2 to 400 (Hz) Unit of setting
0.1 Hz
(see note 1)
Changes during operation
Default setting 60.0
Middle Output Frequency (FB)
0.1 to 399 (Hz) Unit of setting
0.1 Hz
(see note 1)
Changes during operation
Default setting 1.5
Middle Output Frequency Voltage (VC)
1 to 255 (V) (see note 2) Unit of setting
1 V
Minimum Output Frequency (FMIN)
0.1 to 10.0 (Hz) Unit of setting
0,1 Hz
Changes during operation
Default setting 12
No
(see note 2)
Changes during operation
Default setting 1.5
No
No
Minimum Output Frequency Voltage (VMIN)
1 to 50 (V) (see note 2)
Note
Unit of setting
1 V
Changes during operation
Default setting
No
12
(see note 2)
1.
Values will be set in 0.1-Hz increments if the frequency is less than 100 Hz and 1-Hz increments if the frequency is 100 Hz or greater.
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V/f Control
Output voltage
(V) n10(VMAX)
Chapter 5-2
2.
With 400-V Inverters, the values for the upper limit of setting ranges and the default settings will be twice those given in the above table.
Note 1. Set the parameters so that the
following condition will be satisfied.
n14 ≤ n09
Note 2.
The value set in n13 will be ignored if
parameters n14 and n12 are the same n13(VC) n15(VMIN)
0 n14
(FMIN n12
(FB) n11
(FA) n09
(FMA
• Set the rated motor input frequency to the maximum voltage frequency
(FMAX) while the rated motor input voltage is set to the maximum output voltage (VMAX).
• The vertical-axis load or the load with high viscous friction may require high torque at low speed. If the torque is insufficient at low speed, increase the voltage in the low-speed range by 1 V, provided that no overload (OL1 or OL2) is detected. If an overload is detected, decrease the set values or consider the use of an Inverter model with a higher capacity.
• The required torque of fan or pump control increases in proportion to the square of the speed. By setting a quadratic V/f pattern to increase the voltage in the low-speed range, the power consumption of the system will increase.
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