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Additional Precautions According to UL 1604 5
• Disconnect the NE1A-series Controller from the power supply before
starting wiring. Devices connected to the NE1A-series Controller may
operate unexpectedly.
• Properly apply the specified voltage to the NE1A-series Controller inputs.
Applying an inappropriate DC voltage or any AC voltage will cause the
NE1A-series Controller to fail.
• Be sure to separate the communications cables and I/O cables from near
high-voltage/high-current lines.
• Be cautious not to get your fingers caught when attaching connectors to
the plugs on the NE1A-series Controller.
• Tighten the DeviceNet connector screws correctly (0.25 to 0.3 N·m).
• Incorrect wiring may lead to loss of safety functions. Wire conductors cor-
rectly and verify the operation of the NE1A-series Controller before using
the system in which the NE1A-series Controller is incorporated.
• After wiring is completed, be sure to remove label for wire clipping preven-
tion on the NE1A-series Controller to enable heat to escape or proper
cooling.
■ Power Supply Selection
Use a DC power supply satisfying the following requirements.
• The secondary circuits of the DC power supply must be isolated from the
primary circuit by double insulation or reinforced insulation.
• The DC power supply must satisfy the requirements for class 2 circuits or
limited voltage/current circuits given in UL 508.
• The output hold time must be 20 ms or longer.
■ Periodic Inspections and Maintenance
• Disconnect the NE1A-series Controller from the power supply before
replacing the Controller. Devices connected to the NE1A-series Controller
may operate unexpectedly.
• Do not disassemble, repair, or modify the NE1A-series Controller. Doing
so may lead to loss of safety functions.
■ Disposal
• Be cautions not to injure yourself when dismantling the NE1A-series Con-
troller.
5 Additional Precautions According to UL 1604
The NE1A-series Controller is suitable for use in Class I, Div. 2, Group A, B,
C, D or Non-Hazardous Location Only.
WARNING - Explosion Hazard - Substitution of Components May Impair Suit-
ability For Class I, Div. 2.
WARNING - Explosion Hazard - Do Not Disconnect Equipment Unless Power
Has Been Switched OFF or the Area Is Known To Be Non-Hazardous.
WARNING - Explosion Hazard - Do Not Disconnect USB Connector Unless
Power Has Been Switched OFF or the Area Is Known To Be Non-Hazardous.
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