Omron Sysmac NX-PD1000 User Manual page 88

4 Installation and Wiring
Power Supply Used and Required Power Supply Capacity
 Power Supply Used
5 to 24 VDC power is supplied to A1 and A3 terminals of the I/O power supply terminals.
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.
We recommend the following power supply.
Recommended power supply in a CPU Rack: Model S8VK series (Omron)
Recommended power supply in a Slave Terminal: Model S8VK 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 Calculation
Example for Power Supply Capacity of I/O Power Supply on page 4-30 for details on calculating 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
NX1P2 CPU Unit
Communications Coupler
Units
*1. When the Additional I/O Power Supply Unit is connected to the CPU Unit, use the I/O power supply 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
Use the I/O power supply current for the CPU Rack of NX1P2 CPU Unit at 4 A or less. Using
the currents that are outside of the specifications may cause failure or damage.
4 - 28
Rated item
Maximum current of I/O power
supply
Current capacity of I/O power
supply terminals
Maximum current of I/O power
supply
Current capacity of I/O power
supply terminals
*1
Rating
*1
4 A max.
Less than the rating of Additional I/O
Power Supply Unit
NX-series System Units User's Manual (W523)