adept technology MV User Manual

Appendix G DeviceNet Physical Layer and Media
388 Adept MV Controller User’s Guide, Rev. B
• 24 VDC power rating
• Optional power-supply tabs
If the power supplies are equipped with Schottky diodes, the optional power
supply tabs must be protected from bus back-feeding of current among the power
supplies on the bus. We also recommended the use of fuse protection for every
trunkline in the cable system.
The maximum current rating of a thick cable trunk line is 8A.Verify that this
complies with your national and international standards. It might be necessary to
limit the maximum current to a lower value if standards in the U.S. or Canada
apply. The maximum current value is a theoretical value. The cable size supports
a higher current than 8A. Depending on the topology of nodes relative to the
power supply, higher currents might be possible. See the DeviceNet technical
specifications for further information.
The maximum current rating of a thin cable trunk line is 3A. If you use the thin
cable on a long line, the resistance of the cable decreases the maximum current
value. See 94% $( and the DeviceNet technical specifications and for further
information.
For the calculation of the maximum current at a specific length, use the following
formula:
l= Length of the drop line in meters (m)
i= Maximum. current in amps
This calculation applies to the sum of the currents of all the nodes on the selected
drop line. The length (l) is not the cumulative length of the drop line; it is the
maximum distance from any node on the dropline to the trunk line.
Table G-5. Maximum Current on a Dropline Relative to its Length
Length of Dropline Maximum Current
8%  @% 58A 
?8  @*8* 58A ?
8  @ 58A  8%
8% @% 58A 
* @? 58A 8C%
i
4.57
l
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adept technology MV Specifications

General

Brand	adept technology
Model	MV
Category	Controller
Language	English