Omron SYSDRIVE MX2 SERIES, User Manual

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6 Vector Control and Applied Functions
6 - 18 Multi-function Compact Inverter 3G3MX2-V1 User’s Manual (I585-E1)
6-5 V/f Control with Speed Feedback
The 3G3MX2-V1 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.
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 RP Selection (P003) to 01 (Feedback pulse).
In addition, set the Simple Position Control Selection (P012) to 00 (Simple position control disabled).
• 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 S7
Selection (C007) to 85 (EB: Rotation direction detection). The setting “85 (EB: Rotation direction
detection)” only is available only in the Multi-function Input S7 Selection (C007).
When C007 is set to 85 (EB: Rotation direction detection), the Multi-function Input S7 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.
6-5-1 Settings of V/f Control with Speed Feedback
Parameter
No.
Function name Data
Default
data
Unit
A044 1st Control Method
00: Constant torque characteristics
00
−
01: Reduced torque characteristics (VP
1.7th power (VC at low speed))
02: Free V/f setting
P003
Pulse Train Input RP
Selection 01: Feedback pulse (enabled only when 1st
control is selected)
00
−
P012
Simple Position Control
Selection 00: Simple position control disabled
00
−
P004
Pulse Train Input Type
Selection
00: Single-phase pulse train
00
−
01: Phase A and B 90°phase difference
pulse train
02: Do not set.
03: Single-phase pulse train
+
direction
P011
Number of Encoder
Pulses
32. to 1024. 512. pulse
C007
Multi-function Input S7
Selection 85: EB (Rotation direction detection)
06
−