Inovance MD800 Series Function Guide

Function Applications
-476-
4.4 Control Performance
4.4.1 V/f Curve Reference
Table 4–27 Straight-line, multi-point, and square V/f curve reference parameters
Para.
No.
Name
Default
Value Range Description
F3-00
V/f curve
reference
0
0: Straight-line V/f
curve
1: Multi-point V/f
curve
2: Square V/f curve
3: 1.2-power V/f curve
4: 1.4-power V/f curve
6: 1.6-power V/f curve
8: 1.8-power V/f curve
10: V/f complete
separation mode
11: V/f half separation
mode
0: Straight-line V/f curve
Below the rated frequency, the output voltage of the AC drive changes linearly
with the output frequency. This curve is applicable to general mechanical drive
applications such as large-inertia fan acceleration, punch presses, centrifuges,
and water pumps.
1: Multi-point V/f curve
The range of the frequency points is 0.00 Hz to the rated motor frequency. The
range of the voltage points is 0.0% to 100.0%, which corresponds to the range of
0 V to the rated motor voltage. The multi-point V/f curve references are typically
determined based on load characteristics of the motor. Ensure that the following
conditions are met: F3-03 ≤ F3-05 ≤ F3-07.
2: Square V/f curve
Below the rated frequency, the output voltage changes with the output
frequency of the AC drive according to the 2-power curve. This curve is
applicable to applications with light loads that seldom change, such as fans and
water pumps.
3: 1.2-power V/f curve
Below the rated frequency, the output voltage changes with the output
frequency of the AC drive according to the 1.2-power curve.
4: 1.4-power V/f curve
Below the rated frequency, the output voltage changes with the output
frequency of the AC drive according to the 1.4-power curve.
6: 1.6-power V/f curve
Below the rated frequency, the output voltage changes with the output
frequency of the AC drive according to the 1.6-power curve.
8: 1.8-power V/f curve
Below the rated frequency, the output voltage changes with the output
frequency of the AC drive according to the 1.8-power curve.
10: V/f complete separation mode
The output frequency and output voltage of the AC drive are independent of
each other. The output frequency is determined by the frequency source, and
the output voltage is determined by voltage source for V/f separation. This curve
is generally applicable to scenarios such as motor torque control.
11: V/f half separation mode
In this mode, the voltage (V) is proportional to the frequency (f). The relationship
between V and f can be set by the voltage source, and it is also related to the
rated motor voltage and rated motor frequency in group F1. Assuming that the
voltage source input is X (X ranges from 0 to 100%), the relationship between V
and f is as follows: V/f = 2 x X x (Rated motor voltage)/(Rated motor frequency).

Inovance MD800 Series Specifications

General

Brand	Inovance
Model	MD800 Series
Category	DC Drives
Language	English