Rockwell Automation 281G ArmorStart Distributed Motor Controller - Getting Started - Manual (Page 8)

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Publication 280G-QS001A-EN-P - December 2008
The working space around the ArmorStart may be minimized as the
ArmorStart does not require examination, adjustment, servicing or
maintenance while energized. In lieu of this service, the ArmorStart is
meant to be unplugged and replaced after proper lockout/tag-out procedures
have been employed.
DeviceNet Network Installation
The ArmorStart Distributed Motor Controller contains the equivalent of
30 in. (0.76 m) of DeviceNet drop cable's electrical characteristics and
therefore 30 in. of drop cable must be included in the DeviceNet drop cable
budget for each ArmorStart in addition to actual drop cable required for the
installation.
Other DeviceNet System Design Considerations
The separation of the control power and DeviceNet power is recommended
as a good design practice. This minimizes the load on the DeviceNet supply,
and prevents transients which may be present on the control power system
from influencing the communication controls.