7-2
V/f control with speed feedback
The 3G3M1 Series Inverter can perform V/f control with speed feedback by using the pulse train input
function mounted 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 signals from the encoder.
This section describes the settings and functions of V/f control with speed feedback.
7-2-1
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.
• To use this function, set “3: IM V/f control with speed sensor” at 1st Drive Control Selection
(3004Hex-2BHex)/2nd Drive Control Selection (3009Hex-0FHex).
• Set the type of the pulse train signal to input in Input Terminal [PIA][PIB] Pulse Input Format Selec-
tion (3014Hex-0FHex), and the number of pulses per one rotation of the motor (×1 multiplication) in
Input Terminal [PIA][PIB] Encoder Pulse Resolution (3014Hex-10Hex).
• Set values in Input Terminal [PIA][PIB] Pulse Scaling Factor Denominator (3014Hex-11Hex) and In-
put Terminal [PIA][PIB] Pulse Scaling Factor Numerator (3014Hex-12Hex) according to the speed
reduction ratio of the motor and encoder.
Parameter
No.
Function name Data
Default da-
ta
Unit
3004Hex-2
BHex/
3009Hex-0
FHex
1st Drive Control Selec-
tion/
2nd Drive Control Selec-
tion
3: IM V/f control with speed sensor 0 -
3014Hex-0
FHex
Input Terminal [PIA][PIB]
Pulse Input Format Selec-
tion
0: Pulse train signing/pulse train input
2 -
1: Forward/reverse rotation pulse
2: Quadrature A/B signal (B phase lead)
3: Quadrature A/B signal (A phase lead)
3014Hex-1
0Hex
Input Terminal [PIA][PIB]
Encoder Pulse Resolution
20 to 60000 1024 Pulse
3014Hex-11
Hex
Input Terminal [PIA][PIB]
Pulse Scaling Factor De-
nominator
1 to 32767 1 -
3014Hex-1
2Hex
Input Terminal [PIA][PIB]
Pulse Scaling Factor Nu-
merator
1 to 32767 1 -
Details of Input Terminal [PIA][PIB] Pulse Input Format Selection
(3014Hex-0FHex)
The Input Terminal [PIA][PIB] Pulse Input Format Selection (3014Hex-0FHex) setting causes the
inverter to recognize the feedback rotation direction as shown below.
7 Vector Control and Applied Functions
7-11
M1 Series EtherCAT Type User’s Manual (I670)
7-2 V/f control with speed feedback
7
7-2-1 Settings of V/f Control with Speed Feedback
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