Proface APL3000B - Node Box PC Manuel d'utilisateur Page 118

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Chapter 5 Installation and Wiring
5-27
5.4.2 Connecting the Power Supply
This section describes the precautions for supplying a power voltage.
If the supplied voltage exceeds the PL unit’s range, con-
nect a constant voltage transformer.
Between the line and ground, select a power supply that
is low in noise. If there is an excess amount of noise,
connect an insulating transformer.
When supplying power to the PL unit, be sure to
separate the input/output and power lines, as shown.
To increase the noise resistance quality of the power
cord, simply twist each power wire before attaching the
Ring Terminal.
The power supply cable must not be bundled or
positioned close to main circuit lines (high voltage, high
current), or input/output signal lines.
Connect a lightning surge absorber, as shown in the
diagram, to deal with power surges.
To avoid excess noise, make the power cord as short as
possible.
Branch Circuit Protective device shall be use for rating
20A for DC24V input device.
SEE
Chapter 3 "Specifications" (page 3-1)
Use constant voltage and
insulating transformers with
capacities exceeding Power
Consumption value.
Be sure to ground the surge
absorber (E1) separately from the
PL unit (E2).
Select a surge absorber that has
a maximum circuit voltage greater
than that of the peak voltage of
the power supply.
PL
PL Power
PL Power
PL
PL
E2
FG
E1
Twisted-pair cord
PL
FG
T2
T1
Twisted-pair cord
PL
FG
Constant
Voltage
Transformer
Insulating
Transformer
Input/Output
Power
Main Power
Input/Output
Unit
Input/Output
Unit
Input/Output
Unit
Operation
Unit
Main Circuit
Main
Power
Input/
Output
Power
Lightning Surge
Absorber
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