Omron sysmac NX Series User Manual page 103

Unit power supply
terminals
Unit power
supply
The total Unit power supply capacity for these two blocks is the power supply capacity that the
Slave Terminal requires.
Precautions for Correct Use
Select a Unit power supply with sufficient capacity by considering the inrush current when the
power is turned ON. Sometimes, the Unit power supply may not be turned ON caused by inrush
current when the power is turned ON.
 Equation in a CPU Rack of Communication Control Unit
<Equation>
The equation for the Unit power supply capacity in the CPU Rack of Communication Control 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 Communication Control 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 Communication Control Unit
(B): Total power consumption from the NX Unit power supply that is required by the NX Units that are connected to
the Communication Control Unit
(C): NX Unit power supply efficiency of the Communication Control 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>
NX-series System Units User's Manual (W523)
Communications Coupler
Unit block
NX Unit connected to
the Communications
Commu-
Coupler Unit
nications
Coupler
Unit
NX Unit power supply
Internal power
supply circuit
4 Installation and Wiring
Additional NX Unit Power
Supply Unit block
NX Unit connected to the Additional
NX Unit Power Supply Unit
NX Unit power supply
Unit power supply
terminals
Additional NX Unit Power Supply Unit
4
End Cover
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