Rockwell Automation 284 ArmorStart User Manual - Manual (Page 61)

Installation and Wiring 2-37
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. For additional information regarding 24V DC control power
system design, see Appendix D.
Electromagnetic Compatibility
(EMC)
The following guidelines are provided for EMC installation
compliance.
General Notes (Bulletin 284 only)
• The motor Cable should be kept as short as possible in order to
avoid electromagnetic emission as well as capacitive currents
• Conformity of the drive with CE EMC requirements does not
guarantee an entire machine installation complies with CE EMC
requirements. Many factors can influence total machine/
installation compliance.
• Using an EMI filter with any drive rating, may result in relatively
high ground leakage currents. Therefore, the filter must only be
used in installations and solidly grounded (bonded) to the
building power distribution ground. Grounding must not rely on
flexible cables and should not include any form of plug or socket
that would permit inadvertent disconnection. Some local codes
may require redundant ground connections. The integrity of all
connections should be periodically checked.
Grounding
Connect a grounding conductor to the terminal provided as standard
on each ArmorStart Distributed Motor Controller. Refer to Table 2.2
for grounding provision location. There is also an externally available
ground terminal. Refer to Figure 2.5, Figure 2.6, and Figure 2.7.