4 Designing the Power Supply System
4 - 20
NX-series NX1P2 CPU Unit Hardware User’s Manual (W578)
The above is the stationary power consumption during operation. When you select the power sup-
ply, consider the inrush current that will flow when the power is turned ON.
Refer to Electrical and Mechanical Specifications on page 3-3 under 3-1-1 Models and Specifica-
tions on page 3-2 for information on inrush current specifications.
Select an external power supply with sufficient capacity by considering the power supply capac-
ity or inrush current when the power is turned ON. Otherwise, the external power supply may
not be turned ON or it may malfunction due to unstable voltage.
This section describes how to select the I/O power supplies for the CPU Rack.
Use an SELV power supply that meets the following conditions for the I/O power supply.
• Has overcurrent protection.
• Has double or reinforced insulation between the input and output.
• Has an output voltage of 5 to 24 VDC (4.5 to 28.8 VDC).
*1. Use an output voltage that is appropriate for the I/O circuits of the NX Units and the connected external
devices.
Recommended Power Supplies: S8VK-S Series (manufactured by OMRON)
Use the calculation method that is described in 4-3-2 Designing the I/O Power Supply from the NX Bus
on page 4-11 and calculate the total current consumption from the I/O power supply and the required
power supply capacity of the I/O power supply.
Unlike the Unit power supply, it is not necessary to use only one I/O power supply to supply power to all
NX Units on the CPU Rack.
Select an external power supply with sufficient capacity by considering the power supply capac-
ity or inrush current when the power is turned ON. Otherwise, the external power supply may
not be turned ON or it may malfunction due to unstable voltage.
4-4-2 Selecting the I/O Power Supplies
Recommended Power Supplies
Calculating the Required Power Supply Capacity of the I/O Power
Supply for NX Units
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