Analog Output Cable Grounding; Echelon Cable Grounding; Emi-Resistant Echelon Network Grounding (For High-Emi Environments) - Emerson E2 Einstein Manual

7.4.1. Analog Output Cable
Grounding
If using a MultiFlex analog output or 4AO board
to drive a Control Techniques VSD, you MUST use
shielded cable between the analog point and the VSD
drive speed input. Refer to Section 4.2. for specified
cable types.
On the end of the analog output cable connected
to the VSD input, connect the shield wire to an earth
ground. On the I/O device end, clip the shield wire at
the point of exposure - do NOT connect this end of
the shield wire to a terminal on the I/O device or to
an earth ground.
Figure 7-3 shows proper grounding for a Multi-
Flex I/O board and analog output cabling for a device
connected to a VSD.
MULTIFLEX
SHIELD
Figure 7-3 - MultiFlex and AO Cable Grounding
7.5. Echelon Cable Ground-
ing
The shield wires for Echelon cable should be
connected to the 0V (center pin) of each Echelon net-
work connector. At each node and at each break in
the shield, connect the 0V terminals to earth ground.
Use 16AWG or 18AWG wire for the 3.81mm Eche-
lon connectors and 14AWG or greater for the 5mm
Echelon connectors, and limit the ground wire length
to six inches or less.
At the E2, it is recommended the shield wire be
connected to a separate earth ground outside of the
E2 enclosure instead of connected to the 0V terminal
on the E2's Echelon connector.

Echelon Cable Grounding

VSD
CLIP
EARTH
SHIELD
GROUND
7.5.1. EMI-Resistant Echelon Net-
work Grounding (For High-
EMI Environments)
If the Echelon network must be in contact with
noise-generating devices or be installed in a high-
EMI environment, the same practices used for
grounding RS485 networks may be used to ground
Echelon networks. Refer to Section 7.3., EMI-Resis-
tant RS485 Network Grounding Practices and follow
the same practices for Echelon shield grounding as
are shown in this section for RS485 shield ground-
ing.
Cable and Device Grounding • 13