Omron NX-ECC201 User Manual page 98

5 Designing the Power Supply System
Unit power
supply terminals
Unit power
supply
The total of the required Unit power supply capacity for these two blocks is the required power sup-
ply capacity of the Unit power supply for the EtherCAT Slave Terminal.
Precautions for Correct Use
Use the same Unit power supply to supply the Unit power to the entire Slave Terminal. If you
supply power from different Unit power supplies, differences in electrical potential may cause
unexpected currents in the NX Unit power supply, which may result in failure or malfunction.
 Calculation Example
This section provides a calculation example for the configuration example that is given in 5-2-2 Cal-
culation Example for the NX Unit Power Supply on page 5-7.
Name
EtherCAT Coupler Unit
Digital Input Unit
Relay Output Unit
• The NX Unit power supply efficiency of the EtherCAT Coupler Unit is 70%.
In this configuration example, there is only one block, the EtherCAT Coupler Unit block.
Required power supply capacity of Unit power supply to EtherCAT Slave Terminal
= Required Unit power supply capacity of EtherCAT Coupler Unit block
= (Power consumption from NX Unit power supply of EtherCAT Coupler Unit + Total power con-
sumption from NX Unit power supply of NX Units connected to EtherCAT Coupler Unit)/NX
Unit power supply efficiency of EtherCAT Coupler Unit
= (1.45 W + (0.5 W × 5) + (0.8 W × 5))/0.7
= Approx. 11.4 W
Precautions for Correct Use
Consider the inrush current when the power supply is turned ON and select a Unit power sup-
ply with sufficient extra capacity. The inrush current when power is turned ON may prevent the
Unit power supply from operating correctly.
5 - 16
Additional NX Unit Power Supply Unit block
EtherCAT Coupler Unit block
NX Units connected to the
EtherCAT Coupler Unit
EtherCAT
Coupler Unit
NX Unit power supply
∙ ∙ ∙
Internal power supply circuits
Model
NX-ECC201
NX-ID3317
NX-OC2633
NX Units connected to the Additional
NX Unit Power Supply Unit
NX Unit power supply
Unit power
supply terminals
Additional NX Unit Power Supply Unit
Quantity Power consumption/Unit
1 1.45 W
5 0.5 W
5 0.8 W
NX-series EtherCAT Coupler Unit User's Manual (W519)
End Cover