Chapter 5 Function parameter
71
Ch
ap
ter 5
Set frequency f
Time t
Output frequency
Hz
T
Rated frequency fb
T
Figure 5-10:Schematic diagram of S curve plus deceleration B
The function code F3.14 and F3.15 respectively defined the proportion of start-section and
the proportion of end-section for S curve acceleration and deceleration A
，
the two function
code must meet: F3.14 + F3.15 ≤ 100.0%.
In the Figure of the S-curve acceleration and deceleration A, t1 is the time parameter
defined by F3.14, the slope of the output frequency variation during this period is gradually
increasing. t2 is the time parameter defined by F3.15, the slope of the output frequency
variation during the period is gradually changed to 0. Within the time between t1 and t2, the
slope of the output frequency variation is fixed, i.e. the linear acceleration and deceleration is
achieved in this interval.
5-2-6.F4 group V/F control parameters
This group of function code is only valid to V/F control, invalid to vector control.
V/F control is suitable for fans, pumps and other universal loads, or one inverter with multiple
motors, or for the applications that inverter power is significantly different from the motor power.
Code
Parameter name
Setting range
Factory
setting
Cha
nge
F4.00 V/F curve setting
Linear V/F
0
0
★
Multi-point V/F
1
Square V/F
2
1.2th power V/F
3
1.4th power V/F
4
1.6th power V/F
6
1.8th power V/F
8
Reserve
9
V/F completely separate
10
V/F half separate
11
0: Linear V/F ,Suitable for ordinary constant torque load.
1: multi-point V/F ,Suitable for dehydrator, centrifuge and other special loads any V/F
relationship curves can be obtained by setting parameters F4.03 to F4.08.
2: Square V/F ,Suitable for fans, pumps and centrifugal loads.
3 to 8: V/F relationship curve between linear V/F and square V/F.
10:VF separate completely mode. In this mode, the output frequency and output voltage is
separated completely, no any relationship at all, the output frequency controlled by frequency
source setting , but output voltage determined by F4.12 setting.(V/F separate voltage supply
source ) .V/F separated completely mode can suitable for in inductive heating, inverter power
supply, torque motor, etc applications.
11: V/F semi-separate mode. V is proportional to F in this mode, but the proportional
relationship can be set by F4.12 parameters, furthermore, the V and F proportion also relate to
rated voltage of motor and rated frequency in b0 group. Assume that input voltage source is X
( X value range from 0~100%), the output voltage V and output frequency F proportion
relationship can be defined as : V/F=2*X*(rated voltage of motor)/(rated frequency of motor)
F4.01 Torque boost
0.0%:automatic torque boost
，
0.1%
～
30.0%
0.0%
★
F4.02 Torque boost cut-off
0.00Hz
～
F0.19(Maximum frequency)
15.00Hz
★
