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MELSEC-Q
4 SETUP AND PROCEDURES BEFORE STARTING THE OPERATION
[Module handling precautions]
• Since the module case is made of resin, do not drop it or subject it to strong
impacts.
• The module can easily be secured to the base unit using the hook located at
the top of the module. However, if the module is to be used in an area subject
to strong vibration or impact, it is recommended to secure it with the module
fixing screws. In this case, tighten the module fixing screws within the following
clamping torque range.
Module fixing screws (M3): clamping torque ranging from 0.36 to 0.48 N•m
• Tighten the external power supply terminal screw of QJ71LP21S-25 within the
following torque range:
For the specification of the external power supply terminal, refer to section
3.1.1.
External power supply terminal screw (M3): torque ranging from 0.42 to 0.58
N•m
DANGER
• Do not touch the terminals and the connectors while the power to the module is on.
Doing so may cause electric shocks or malfunctions.
• If the module is not mounted properly and fastened with the screws, it may cause
the module to malfunction, break down or fall off. If the screws are tightened
excessively, it may damage the module and the screws, and cause the module to
short-circuit, malfunction or fall off.
CAUTION
• Be careful not to let foreign particles such as chaff or wire chips enter the module.
They may cause fire, breakdowns or malfunctions.
• Never disassemble or modify the module.
It may cause breakdowns, malfunctions, injuries or fire.
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