V/F Control With Speed Feedback; Settings Of V/F Control With Speed Feedback - Omron MX2 Series User Manual

6 Vector Control and Applied Functions
6-5

V/f Control with Speed Feedback

The 3G3MX2-EV2 Series Inverter can perform V/f control with speed feedback with the pulse train input
function included as standard.
This control enables highly accurate and stable speed control based on the feedback of the pulse gen-
erator (PG) signal or the phase-A/B signal from the encoder.
This section describes the settings and functions of V/f control with speed feedback.
6-5-1

Settings of V/f Control with Speed Feedback

In this control mode, the inverter can perform highly accurate and stable speed control as V/f control,
based on the speed feedback data.
• The V/f control with speed feedback function is available only for the 1st control. It will not work if you
switch to the 2nd control.
• To use this function, set the 1st Control Method (A044) to 00 (Constant torque characteristics), 01
(Reduced torque characteristics), or 02 (Free V/f setting).
• Set the Pulse Train Input EA Selection (P003) to 01 (Feedback pulse).
• Set the type of the input pulse train signal in the Pulse Train Input Type Selection (P004) and the
number of pulses per motor rotation (1 multiplication) in the Number of Encoder Pulses (P011),
respectively.
• If you set the Pulse Train Input Type Selection (P004) to 01 or 03, also set the Multi-function Input 7
Selection (C007) to 85 (EB: Rotation direction detection). The setting "85 (EB: Rotation direction
detection)" only is available only in the Multi-function Input 7 Selection (C007).
When C007 is set to 85 (EB: Rotation direction detection), the Multi-function Input 7 Operation
Selection (C017) is disabled.
The terminal EB, once set, serves as the phase-B input for Phase A and B 90°phase difference pulse
train (P004 = 01), or the direction signal for Single-phase pulse train + direction (P004 = 03).
If C007 is not set to 85 (EB: Rotation direction detection) when P004 is 01 or 03, the inverter cannot
recognize the feedback information correctly, which causes the V/f control with speed feedback to
malfunction.
Parameter
No.
A044
P003
P004
P011
C007
6 - 18
Function name
1st Control Method
Pulse Train Input EA
Selection
Pulse Train Input Type
Selection
Number of Encoder
Pulses
Multi-function Input 7
Selection
Multi-function Compact Inverter 3G3MX2-EV2 User's Manual (I666-E1)
Data
00: Constant torque characteristics
01: Reduced torque characteristics (VP
1.7th power (VC at low speed))
02: Free V/f setting
01: Feedback pulse (enabled only when 1st
control is selected)
00: Single-phase pulse train
01: Phase A and B 90°phase difference
pulse train
02: Do not set.
03: Single-phase pulse train + direction
32. to 1024.
85: EB (Rotation direction detection)
Default
Unit
data
−
00
−
00
−
00
512. pulse
−
06