*1. When both the forward RUN command and the reverse RUN command are ON or OFF, the inverter does
not start output.
*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.
6-7-2 Recommended Encoder for Simple Position Control and Its Wiring
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-EV2 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 L 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.
⚫
Complementary output
Complementary output is a method to output via two tran-
sistors.
The wiring is connected to the 0-V side when output is ON and to
the power-supply side when output is OFF.
This design does not allow the wiring to be left open (at a
high impedance) as with the case of open-collector output
encoders.
Therefore, this provides a stable output from the encoder.
NPN
Transistor
PNP
Transistor
E6C3-CWZ5GH
Power
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