• Has overcurrent protection.
• Has double or reinforced insulation between the input and output.
•
Has an output voltage that falls within the power supply voltage range for the Unit power supply.
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 (Om-
ron)
Precautions for Correct Use
• Use the same Unit power supply to supply power to the entire CPU Rack. If you supply power
from different power supplies, dif
ferences in electrical potential may cause unexpected cur-
rents in the NX Unit power supply, which may result in failure or malfunction.
• Use the same Unit power supply to supply power to the entire Slave Terminal. If you supply
power from different power supplies, differences in electrical potential may cause unexpected
currents in the NX Unit power supply, which may result in failure or malfunction.
Required Power Supply Capacity
The equation for the Unit power supply capacity in the CPU Rack and in the Slave Terminal is as fol-
lows.
Equation in a CPU Rack of CPU Unit
<Equation>
The equation for the Unit power supply capacity in the CPU Rack of CPU Unit is as follows.
Unit power supply capacity in the CPU Rack = Total power capacity from Unit power supply on each block
The equation for the Unit power supply capacity on each block in the CPU Rack is as follows.
• Required Unit power supply capacity of each block in the CPU Unit= (A) + ((B)/(C))
• Unit power supply capacity of Additional NX Unit Power Supply Unit block = ((D) + (E))/(F)
(A): Unit power consumption of a CPU Unit
(B): T
otal power consumption from the NX Unit power supply that is required by the NX Units that are connected to
the CPU Unit
(C): NX Unit power supply ef
ficiency of the CPU Unit
(D): NX Unit power consumption of the additional NX Unit Power Supply Unit
(E): Total power consumption from the NX Unit power supply that is required by the NX Units that are connected to
the Additional NX Unit Power Supply Unit
(F): NX Unit power supply efficiency of the Additional NX Unit Power Supply Unit
<Block>
The following shows the Unit that supplies NX Unit power and its supplying range. For example,
the CPU Rack in the following diagram is configured with two blocks: the CPU Unit block and the
Additional NX Unit Power Supply Unit block.
4 Installation and Wiring
4-29
NX-series System Units User's Manual (W523)
4-6 Wiring the Additional Power Supply Units
4
4-6-1 Wiring the Additional NX Unit Power Supply Unit
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