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MELSEC-Q
4 SETUP AND PROCEDURE BEFORE STARTING THE OPERATION
4.4 Wiring
The following explains how to wire the encoder and the controller to the QD62(E/D).
4.4.1 Wiring precautions
In order to fully utilise the functions of the QD62(E/D) and ensure system reliability,
external wiring having a minimum of noise effect must be provided.
The precautions regarding external wiring are described below.
(1) Different terminals have been prepared for connection depending on the voltage
of the input signal. Connecting a terminal of incorrect voltage may result in
malfunction or mechanical failure.
(2) For 1-phase input, always perform pulse input wiring on the Phase A side.
(3) When pulse status noise is input, the QD62(E/D) may miscount.
(4) Always provide the following measures against noise for high-speed pulse input:
(a) Use shielded twisted pair cables.
(b) Avoid placing the shielded twisted pair cables or input/output cables. Place
the cable at least 150 mm (5.9 inch) from such wires and perform wiring
using the least distance as possible.
(c) Individually ground the shielded cables on the encoder side (relay box) with
a ground resistance of 100
or less.
(d) An example of wiring incorporating measures against noise is shown below:
• Ground the shielded twisted pair cable on the encoder side (relay box). (Wiring example: with an open
collector output type encoder (24 V DC))
To A
To QD62 (E/D)
Current for the encoder
24V
E
+ 24 V
0 V
E
The shielded wire for the encoder and shielded
twisted pair cable are connected inside the rela
y
box .
If the shielded wire for the encoder is not grounded
inside the encoder, ground it in the relay box, as
indicated by the dotted line.
To the encoder
To B
A
B