4-1
Power Supply System
The power supply system for the CPU Rack of the NX-series NX1P2 CPU Unit consists of two power
supply lines: one for NX Unit power and the other for I/O power. Therefore, you need to prepare two
separate external power supplies for them.
You may need additional power supply Units for NX Unit power or I/O power according to the total
power consumption or the total current consumption of NX Units on the CPU Rack.
Design the power supply system for the CPU Rack of the NX-series NX1P2 CPU Unit as below.
• Calculate the NX Unit power consumption to determine NX Unit power supply specifications, includ-
ing whether to add additional power supply Units or not.
• Calculate the I/O power current consumption and voltage drop to determine I/O power supply speci-
fications, including whether to add additional power supply Units or not.
4-1-1
NX Unit Power Supply and I/O Power Supply
This section provides details on NX Unit power supply and I/O power supply.
NX Unit Power Supply
NX Unit power is supplied to the internal circuits of each NX Unit on the CPU Rack of the NX1P2 CPU
Unit.
It is delivered via the Unit power supply terminals of the CPU Unit or those of an Additional NX Unit
Power Supply Unit. Those terminals are connected to an external power supply device, which is refer-
red to as an Unit power supply.
The Unit power supply provides power for the internal circuits of the CPU Unit and the Option Board,
as well as NX Unit power for the NX Units.
Up to 10 W of NX Unit power can be delivered to NX Units via the NX bus connectors.
Internal
circuits
NX Units (8 max.)
Unit power supply terminals
End Cover
NX bus connector
NX Unit power supply
Internal
circuits
Internal
circuits
Internal
circuits
Internal
circuits
Unit power supply
(24 VDC)
NX-series
NX1P2 CPU
Unit
Internal
power
supply
circuit
Internal circuits
Option Board
○
4 Designing the Power Supply System
4-2
NX-series NX1P2 CPU Unit Hardware User’s Manual (W578)
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