Omron Sysmac NX-PD1000 - Page 106

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
*1. Use an output voltage that is appropriate for the I/O circuits of the NX Units and the connected external
devices.
We recommend the following power supply.
Recommended power supply in a CPU Rack: Model S8VK-S series (Omron)
Recommended power supply in a Slave Terminal: Model S8VK-S series or Model S8JX series
(Omron)

Required Power Supply Capacity
The power supply capacity required by the I/O power supply to be connected is equal to the NX
Unit power supply total power consumption that uses the same I/O power supply. Refer to Calcula-
tion Example for Power Supply Capacity of I/O Power Supply on page 4-
36 for details on calculat-
ing the required power supply capacity.
However, if the inrush current occurs when a connected external device turns ON or OFF, do not
allow the effective value of the I/O power supply current including the inrush current to exceed the
following rated values.
Connecting destination of
Additional I/O Power Sup-
ply Unit
Rated item Rating
NX1P2 CPU Unit Maximum current of I/O power
supply
4 A max.
*1
Current capacity of I/O power
supply terminals
• NX502 CPU Unit
• NX102 CPU Unit
• Communications Coupler
Unit
• Communication Control
Unit
Maximum current of I/O power
supply
Less than the rating of Additional I/O
Power Supply Unit
Current capacity of I/O power
supply terminals
*1. When the Additional I/O Power Supply Unit is connected to the NX1P2 CPU Unit, use the I/O power sup-
ply current at 4 A or less, regardless of the Additional I/O Power Supply Unit specifications.
Refer to A-1 Data Sheet on page A-2 for details on the ratings for Additional I/O Power Supply
Unit.
Precautions for Safe Use
The I/O power supply current for the CPU Rack with an NX-series CPU Unit should be within
the range specified for the CPU Unit model. For example, use the NX1P2 CPU Unit with a cur-
rent of 4 A or less. Using the currents that are outside of the specifications may cause failure or
corruption. Refer to the user’s manual for the connected CPU Unit for the I/O power supply cur-
rent for the CPU Unit model.
Do not allow the inrush current to exceed the values in the table below.
4 Installation and Wiring
4-34
NX-series System Units User's Manual (W523)