Omron SYSDRIVE MX2 SERIES, Руководство пользователя

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6 Vector Control and Applied Functions
Multi-function Compact Inverter 3G3MX2-V1 User’s Manual (I585-E1)
6
-7 Sim
p
le Pos
ition
Co
ntro
l
6
6-
7-2 Re
commend
ed Enco
der for
Simple Position Cont
rol and It
s Wir
ing
z Details of Pulse Train Input Type Selection (P004)
The Pulse Train Input Type Selection (P004) setting causes the inverter to recognize the feedback
rotation direction as shown below.
The type of encoder recommended for simple position control and the wiring method for the encoder signal
are described below.
For the pulse train input function of the 3G3MX2-V1 Series Inverter, be sure to use a complemen-
tary-output type encoder.
In addition, for encoder cable connection, always use a shielded cable and connect it to the terminal SC
of the inverter’s control circuit terminal block.
If an open-collector output encoder is used, the inverter may not recognize the rotation in the forward or
reverse direction. This is because, as the length of the encoder cable increases, its stray capacitance
becomes larger, which causes the inverter to falsely recognize the crosstalk signal from the encoder.
Pulse Train Input Type
Selection (P004) setting
RUN command
*1
*1. When both the forward RUN command and the reverse RUN command are ON or OFF, the inverter does
not start output.
Multi-function
Input S7
Terminal EB
Recognition of feedback rotation
direction
Forward Reverse
00
(Single-phase pulse train) ON OFF
−
Forward
*2
*2. The inverter recognizes the rotation direction via RUN command input because it cannot recognize the ro-
tation direction by the single-phase pulse train.
However, if the RUN command is switched during operation, the inverter retains the rotation direction be-
fore the switching until its output frequency causes a deceleration stop and then switches to the rotation
direction recognized via RUN command input.
In this case, position error may occur due to the difference between the output frequency and the actual
operating frequency of the motor.
Under single-phase pulse position control, be sure to stop the motor once before you change the direction
of motor rotation.
OFF ON
Reverse
*2
01
(Phase A and B 90
°
phase
difference pulse train)
Forward or
Reverse is ON
Lower than
1.8 kHz
*3
*3. For the multi-function Input S7 terminal, the maximum frequency is 1.8 kHz. Therefore, the inverter cannot
recognize the rotation direction from the Phase A and B 90
°
phase difference pulse train at over 1.8 kHz
via the terminal EB.
At 1.8 kHz or higher, the inverter retains the rotation direction at lower than 1.8 kHz.
Detects encoder rotation (90 ° phase
difference).
1.8 kHz min.
*3
Retains rotation direction at lower
than 1.8 kHz via the terminal EB.
03
(Single-phase pulse train
+
direction)
Forward or
Reverse is ON
OFF
Forward rotation (Follows terminal
EB)
ON
Reverse rotation (Follows terminal
EB)
6-7-2 Recommended Encoder for Simple Position Control and Its Wiring
Recommended Encoder