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External Wiring; Wiring Precautions - Mitsubishi Electric QD62E User Manual

Melsec-q series high-speed counter module.
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5. External Wiring

5.1 Wiring Precautions

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) For the QD62 (E/D), count will be performed if pulse status noise is input
and a miscount will result.
4) Provide the following measures against noise for high-speed pulse input:
a) Always use a shielded twisted pair cable and provide grounding.
b) Avoid placing the shielded twisted pair cable parallel to wires that have
large amounts of noise such as power cables or input/output cables.
Place the cable at least 150mm (5.9 inch) from such wires and perform
wiring using the least distance as possible.
5) An example of wiring incorporating measures against noise is shown
• Grounding the shielded twisted pair cable is performed on the encoder side (relay box). (This example shows
Current for the encoder
To A
To B
To QD62 (E/D)
QD62 (E/D)
Terminal block
Do not enclose solenoids and inductive loads together within the same metal conduit.
If a sufficient distance cannot be secured to isolate ducts and other wires from a high-
voltage line, use CVVS or other shielded wire for the high-voltage line.
Provide a clearance
of 150 mm (5.9 inch)
or more from I/O
wires to high voltage
equipment such as
inverters. (Also
exercise caution for
wiring inside the
connection with 24 V sink load.
+ 24 V
0 V
Relay box
To the encoder
The shielded wire for the encoder and shielded
twisted pair cable are connected inside the relay 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.
The distance between the encoder and relay box
must be short. Allowing a long distance between
the QD62 (E/D) and the encoder may cause a
voltage-drop problem. Using a tester or other
measuring device, confirm that the voltage at the
terminal block of the relay box doesn't exceed the
rated voltage when the encoder is in operation or
at standstill. If a substantial voltage drop occurs,
increase the wire size or use a 24 V DC encoder
with minimal current consumption.


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