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3 Installation and Wiring
NA-series Programmable Terminal Hardware(-V1) User’s Manual (V125)
3-3 Installing NA Units
3
3-3-1 Installation in a Control Panel
• Do not let metal particles enter the NA Unit when preparing the panel.
• To conform to UL Type 4X standards, the thickness must be 1.6 to 4.5 mm.
To conform to UL Type 4X standards, always use the NA5-W-V1 with a
High-pressure Waterproof Attachment (PWA). If you do not use a PWA, there is a risk of
water entry, which may cause severe equipment damage.
• Tighten the Mounting Brackets evenly to a torque of between 0.5 and 0.6 N·m to maintain
water and dust resistance. If the tightening torque exceeds the specified value, or the tighten-
ing is not even, deformation of the front panel may occur. What is more, make sure the panel
is not dirty or warped and that it is strong enough to hold the NA Unit.
• As the rubber packing will deteriorate, shrink, or harden depending on the operating environ-
ment, periodical inspection is necessary.
• When using the NA5-W-V1, to help prevent electrical shock, ground to 100 Ω or
less by using dedicated ground wires (with cross-section area of 2 mm
2
or larger) and tighten
the terminal screw on the protective ground terminal to a torque of 1.0 to 1.2 N·m.
Precautions for Correct Use
• Completely shield the gap at openings in the control panel or operation panel with a gasket.
• Refer to Grounding Methods and Precautions on page 3-19 and wire the functional ground
terminal ( ) of the NA-series PT as required.
The NA Units comply with shipbuilding standards. Refer to Conformance to Shipbuilding Stan-
dards on page 22 for information on applicable shipbuilding standards.
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