Wiring; Wiring Precautions - Mitsubishi Electric MELSEC Q Series User Manual

4.6

Wiring

This section describes precautions on wiring the QD73A1 and external devices, and connection of external device
connectors.
4.6.1

Wiring precautions

This section describes the precautions on wiring.
• Check the terminal layout beforehand to wire cables to the module correctly.
• Connectors for external devices must be crimped or pressed with the tool specified by the manufacturer, or
must be correctly soldered. Incomplete soldering or crimping may result in malfunction.
• Prevent foreign matter such as dust or wire chips from entering the module. Such foreign matter can cause
a fire, failure, or malfunction.
• A protective film is attached to the top of the module to prevent foreign matter, such as wire chips, from
entering the module during wiring. Do not remove the film during wiring.
Remove it for heat dissipation before system operation.
• Connect the external device connectors to the connectors on the module and tighten the screws securely.
Tighten the connector screws within the specified torque range.
Undertightening can cause short circuit, fire, or malfunction.
Overtightening can damage the screw and/or module, resulting in drop, short circuit, fire, or malfunction.
Connector screw (M2.6 screw)
• When disconnecting a cable from the module or the drive unit, do not pull the cable by the cable part.
Disconnect the cable holding the connector.
Pulling a cable connected to the module or the drive unit can cause malfunction.
Such action can also damage the module, drive unit, or cable.
• Do not install the connection cables for external I/O signals and for the drive unit together with the main
circuit lines, power cables, or load circuit lines of a device other than the programmable controller. Keep a
distance of 100mm or more between them.
Failure to do so may result in malfunction due to noise, surges, and induction.
• Place the cables in a duct or clamp them. If not, dangling cable may swing or inadvertently be pulled,
resulting in damage to the module, drive unit, or cables, or malfunction due to poor contact.
64
Screw Tightening torque range
0.20 to 0.29N • m