YOKOGAWA CENTUM CS, Technical Information

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1. System Installation Requirements
1-17
TI 33J01J10-01EN
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Notes for the field power supply unit of N-IO
As described in GS 33J62F40-01EN “Models A2BN3D, A2BN4D, A2BN5D Base Plates (for
N-IO)”, field power supply (24 V DC) is required for “Base plate for adaptor” (Model A2BN3D).
When using the node interface unit A2NN30D-

4

(24 V DC power input type)
in combination with A2BN3D and the power supply unit as shown on the left side of the figure
below, it is recommended to separate the power supply as shown in right.
This is because the rapid change of the field output load of A2BN3D may causes an influence on
24 V power line, it is worried that the input voltage rating of A2NN30D will not be satisfied.
F010305.ai
Power supply
24 V DC
A2BN3D A2NN30D A2NN30D
Field power supply
for A2BN3D
24 V DC
Power supply
for A2NN30D
24 V DC
A2BN3D
Recommended Unrecommended
Figure Connection of the field power supply of A2BN3D
n
Cabling
Observe the following when cabling the power unit to the CENTUM VP system equipment:
• Protect signal cables from induced noise.
• Protect signal cables from induction from high-voltage power lines.
• Separate the CENTUM VP system power supply from other equipment power supplies-use
a separate power distribution board.
• Provide a dedicated breaker for each power supply. Install breakers and devices they
control in the same room.
• Label the breakers with the name of the connected equipment.
• Install the breakers where they can be easily operated.
• The breaker, must not interrupt connection by wiring to protective grounding system.
• Install power supply cables and high-voltage power lines in metallic conduits as much as
possible.
• Use shielded cables if metallic conduits cannot be provided.
Mar. 15, 2018-00