Proface APL3000B - Node Box PC - Manual (Page 12)

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• The torque required to tighten these
screws is 0.5 to 0.6N
•m.
• To prevent the possibility of a terminal
short, use a pin terminal that has an
insulating sleeve.
2. Power Supply Cautions
• Input and Output signal lines must be
separated from the power control cables
for operational circuits.
• To improve the noise resistance, be sure to
twist the ends of the power cord wires
before connecting them to the Power
connector (Plug).
• The PS-B unit’s power supply cord should
not be bundled with or kept close to main
circuit lines (high voltage, high current), or
input/output signal lines.
• To reduce noise, make the power cord as
short as possible.
• If the supplied voltage exceeds the PS-B
unit’s range, connect a voltage transformer.
• Between the line and the ground, be sure to
use a low noise power supply. If there is an
excess amount of noise, connect a noise
reducing transformer.
• The temperature rating of field installed
conductors: 75
°C only.
• Use voltage and noise reducing
transformers with capacities exceeding
Power Consumption value.
• Must be used with a Class 2 Power
Supply. (24VDC)
• Connect a surge absorber to handle
power surges.
• Be sure to ground the surge absorber
(E1) separately from the PS-B unit
(E2). Select a surge absorber that has
a maximum circuit voltage greater than
that of the peak voltage of the power
supply.
3. Grounding Cautions
• Be sure to create an exclusive ground for
the Power Cord’s FG terminal. Use a
grounding resistance of 100
Ω, a wire of
2mm
2
or thicker, or your country’s
applicable standard.
• The SG (signal ground) and FG (frame
ground) terminals are connected internally
in the PS-B unit.
When connecting the SG line to another
device, be sure that the design of the
system/connection does not produce a
shorting loop.
• The grounding wire should have a cross
sectional area greater than 2mm
2
. Create
the connection point as close to the PS-B
unit as possible, and make the wire as
short, as possible. When using a long
grounding wire, replace the thin wire with
a thicker wire, and place it in a duct.
Lightening Surge Absorber
E1 E2
FG
PS-B
Other
Equipment
Exclusive Grounding
(BEST)
PS-B
Other
Equipment
Common Grounding
(OK)
PS-B