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5 Designing the Power Supply System
NX-series EtherCAT Coupler Unit User’s Manual (W519)
5-3 D
esign
ing
the
I/O Po
wer Su
pp
ly System
5
5-
3-2 D
esigning the I/O Power
Supply fr
om the NX Bus
Voltage drop occurs in the EtherCAT Slave Terminal due to the contact resistance at the points where
Units are connected to each other. Design the I/O power supply system to maintain the voltage specifi-
cations of the NX Unit I/O circuits and connected external devices even if the voltage of the I/O power
supply drops.
As shown in the following table, the voltage drop per Unit depends on the total current consumption
from the I/O power supply.
Here, the following Unit configuration example is used to show how to calculate the I/O power that is
supplied by the EtherCAT Coupler Unit. The same method can be used to calculate the I/O power sup-
ply from an Additional I/O Power Supply Unit.
*1. The current consumption of the EtherCAT Coupler Unit is not actually 0 A. However, a value of 0 A is used in
this calculation example.
In actual calculations, use the current consumption from the I/O power supply that is given elsewhere in this
manual.
Outline
Find the I/O power supply voltage of the NX Unit that is the farthest from the EtherCAT Coupler Unit.
In this example, the I/O power supply voltage of Unit (7) is found.
Conditions
Assume that an I/O power supply voltage of 24.00 VDC is supplied to the I/O power supply terminals
on the EtherCAT Coupler Unit.
Calculating the Voltage Drop in the I/O Power Supply
Total current consumption from the I/O
power supply
Voltage drop per Unit
4 A
0.08 V
3 A
0.06 V
2 A
0.04 V
1 A
0.02 V
Example:
(1)
(2)
(2)
(4)
(5)
(6)
(7)
To external
devices
To external
devices
I/O power
supply
(24 VDC)
Power Consumption of Individual Units
(1): 0 A
*1
(Supplied from the NX bus.)
(2) and (3): 1.5 A each (Supplied from the NX bus.)
(4) and (5): 0 A (Supplied from external source.)
(6) and (7): 0.5 A each (Supplied from the NX bus.)
● Total current consumption from the Units
that are supplied I/O power from the
EtherCAT Coupler Unit (total for (1) to
(7) = 4 A)
● Units that are supplied I/O
power from the Additional I/O
Power Supply Unit
Additional I/O Power Supply Unit
EtherCAT Coupler Unit NX Units
End Cover
To external
devices
I/O power
supply
(24 VDC)
Summary of Contents for NX-ECC201
Page 38: ...Sections in this Manual 36 NX series EtherCAT Coupler Unit User s Manual W519...
Page 46: ...1 EtherCAT Networks 1 8 NX series EtherCAT Coupler Unit User s Manual W519...
Page 56: ...2 Features and System Configuration 2 10 NX series EtherCAT Coupler Unit User s Manual W519...
Page 82: ...4 Part Names and Functions 4 14 NX series EtherCAT Coupler Unit User s Manual W519...
Page 100: ...5 Designing the Power Supply System 5 18 NX series EtherCAT Coupler Unit User s Manual W519...
Page 214: ...9 Setting Up Slave Terminals 9 44 NX series EtherCAT Coupler Unit User s Manual W519...
Page 254: ...11 EtherCAT Coupler Unit Functions 11 30 NX series EtherCAT Coupler Unit User s Manual W519...
Page 278: ...12 Communications Performance 12 24 NX series EtherCAT Coupler Unit User s Manual W519...
Page 340: ...14 Maintenance and Inspection 14 8 NX series EtherCAT Coupler Unit User s Manual W519...
Page 400: ...Appendices A 60 NX series EtherCAT Coupler Unit User s Manual W519...
Page 401: ...Index 1 NX series EtherCAT Coupler Unit User s Manual W519 I Index...
Page 405: ......