Digital Electronics Corporation PL-3900T Series Installationshandbuch - Seite 16
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Seite drucken• The temperature rating of field installed
conductors: 75°C only.
• Use voltage and noise reducing trans-
formers with capacities exceeding
Power Consumption value.
• Branch Circuit Protective device shall be
use for rating 20A for DC24V input device.
• Connect a surge absorber to handle
power surges.
• Be sure to ground the surge absorber
(E1) separately from the PL unit (E2).
Select a surge absorber that has a maxi-
mum circuit voltage greater than that of
the peak voltage of the power supply.
E1
4.
Grounding Cautions
• Be sure to create an exclusive ground for the
Power Cord's FG terminal. Use a grounding
resistance of 100Ω, a wire of 2mm
or your country's applicable standard.
• The SG (signal ground) and FG (frame
ground) terminals are connected internally
in the PL 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
the connection point as close to the PL 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.
PL
FG
E2
Lightening Surge Absorber
2
or thicker,
2
. Create
Exclusive Grounding
PL unit
Common Grounding (OK)
PL unit
Common Grounding
PL unit
5.
Input/Output Signal Line Cautions
• All PL Input and Output signal lines must
be separated from all operating circuit
(power) cables.
• If this is not possible, use a shielded cable
and ground the shield.
• To improve noise immunity, it is recommended
to attach a ferrite core to the power cord.
16
(BEST)
Other
Equipment
Other
Equipment
(Not OK)
Other
Equipment