4
Designing the Power Supply Sys-
tem
This section describes how to design the power supply system for the NX-series
NX1P2 CPU Unit.
4-1
Power Supply System.................................................................................... 4-2
4-1-1 NX Unit Power Supply and I/O Power Supply................................................. 4-2
4-1-2 NX-series Power Supply-related Units ............................................................ 4-3
4-2 Designing the NX Unit Power Supply System........................................... 4-10
4-2-1 Procedure for Designing the NX Unit Power Supply System ........................ 4-10
4-2-2 Calculation Example for the NX Unit Power Supply.......................................4-11
4-3 Designing the I/O Power Supply System ................................................... 4-13
4-3-1 I/O Power Supply Method ............................................................................. 4-13
4-3-2 Designing the I/O Power Supply from the NX Bus ........................................ 4-14
4-3-3 Designing the I/O Power Supply from External Sources............................... 4-19
4-3-4 Designing I/O Power Supply for the Built-in I/O ............................................ 4-19
4-3-5 Restrictions on Inrush Current for ON/OFF Operation .................................. 4-21
4-4 Selecting External Power Supplies and Protective Devices.................... 4-22
4-4-1 Selecting the Unit Power Supply ................................................................... 4-22
4-4-2 Selecting the I/O Power Supplies.................................................................. 4-24
4-4-3 Selecting Protective Devices......................................................................... 4-25
4-1
NX-series NX1P2 CPU Unit Hardware User’s Manual (W578)
4
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