Connecting To Unit Power Supply And I/O Power Supply; Precautions At Supplying Unit Power And I/O Power; Unit Power Supply Specifications - Omron E3NX-FA Operation Manual

4 Installation and Wiring
4-3 Connecting to Unit Power Supply
and I/O Power Supply
A unit power supply is required to connect if you use the E3NW-ECT to build the EtherCAT network.
E3NW-ECT does not require an I/O power supply.
The method for supplying power to the Unit is described below.
4-3-1

Precautions at Supplying Unit Power and I/O Power

When supplying the unit power supply and I/O power supply, take the followings into consideration for
allowable current of cables and connectors, voltage drop, and layout of power supplies.
 Consideration to cable voltage drop
The power supply voltage of a Slave Unit farthest to the power supply must be within the allowable
variation range.
 Supplying unit power supply and I/O power supply from multiple sources
When the unit power and I/O power are supplied from multiple power supplies instead of from one power
supply, the line current, voltage drop, and cable size can be reduced. Moreover, it is effective to secure
safety of the system at power supply errors.
 If power supply errors occur
Consideration on layout and grouping of power supplies differ by whether you want to stop the entire
system or not when a power supply error occurs.
If you want to avoid stopping the entire system, we recommend to set power supplies at several
locations and supply power to groups of Slave Units, or take similar measures.
This has also the effects of reducing voltage drop and cable size and so on.
4-3-2

Unit Power Supply Specifications

Use a general purpose power supply that satisfies the following specifications.
Item
Output voltage
Output ripple
Output current
Isolation
We recommend S8JX series power supplies made by OMRON for the unit power supply for Slave
Units.
Precautions for Correct Use
• The I/O power supply for the input section of the e-CON connector type Slave Units is shared
with the unit power supply. To calculate the output current of the Unit power supply, the current
consumption of the Unit power supply must include the total current consumption of the
E3NW-DS and the current consumptions of the Sensor Amplifier Units that are used.
• Select a power supply that has sufficient capacity, allowing for the inrush current at system
startup.
4 - 8
Specification
24 VDC ± 10%
600 mVp-p
Has the capacity to supply power more than the total current
consumption of each Slave Unit
Between output and AC power supply as well as between output and
chassis ground
E3NW-ECT EtherCAT Digital Sensor Communication Unit Operation Manual (E429)