A Appendices
A - 58
E3NW-ECT EtherCAT Digital Sensor Communication Unit Operation Manual (E429)
Observe the following precautions for the allowable current for cables and connectors, for voltage drop,
and for power supply layout.
Precaution for Cable Voltage Drop
Make sure that the power supply to the Distributed Sensor Unit that is farthest from the power
source is within the allowable fluctuation range.
Supplying Power from Multiple Power Sources
If you supply the Unit power from more than one power source, you can reduce the line current, the
voltage drop, and the cable size.
This can also be used to help ensure system safety against power supply problems.
Power Supply Problems
You must determine the power supply layout and groupings according to whether the entire system
is to be stopped or whether stopping the entire system is to be avoided when problems occur in the
power supply.
To avoid stopping the entire system, we recommend that you supply power from more than one
power source and supply power to separate groups of Distributed Sensor Units from each.
This will also reduce the voltage drop and allow you to use smaller cables.
Use a standard power supply that meets the following specifications.
We recommend using an OMRON S8JX Power Supply to supply Unit power.
Precautions for Correct Use
• 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.
A-2-4 Power Supply Specifications and Connections of the
Distributed Sensor Unit
Precautions for Unit Power Supply
Unit Power Supply Specifications
Item Specification
Output voltage 24 VDC 10%
Output ripple 600 mVp-p
Output current
The supply capacity of the power supply must be equal to or greater
than the total current consumption of all slaves.
Isolation
Between output and AC power supply and between output and frame
ground
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