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.
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