Emerson DL8000 - Input;Output Field Signal Wiring; Electrical Grounds

DL8000 Preset Instruction Manual
2-20 Installation and Use Revised February-2016
 Connect RS-485 serial data signals via two twisted pairs with
overall shield, AWG 28 to AWG 22. Ideally, the capacitance should
not be greater than 16 pF per foot (Belden 9842 for example). The
use of a signal common (ground) conductor connected to each
device is a recommended option. Capacitance greater than 16 pF per
foot may be used at reduced baud rates and/or with shorter data
communication cable runs.
 Use AWG 28 to AWG 18 RS-232 single ended serial data signals
for cable lengths up to 15 meters (50 feet).
 Ensure that all cables have either Teflon
®
or PVC exterior jackets.
 Install insulated wire and cable in accordance with the
manufacturer's recommendation. Do not exceed maximum wire
tension, maximum insulation pressure, or minimum bending radius.
 Use suitable lubrication during wire pulls in conduit to prevent wire
stress.
 Place cable or wire markers at the terminations of all cables and
individual wires. Markers should contain the specific wire or cable
codes designated for that particular circuit. The wire and cable
markers should be legible and permanent.
 Check all wiring connected to the DL8000 for continuity, proper
size, and proper classification. Verify the source or destination of
each circuit before connecting to the DL8000 and related devices.
2.7.4 23BInput/Output Field Signal Wiring
Following are recommendations for process signal wiring:
 Use metal conduit for all process signal wiring.
 Use separate conduits for AC and DC voltage circuits.
 Ensure that all process signal wiring is a single, continuous length
between field devices and the DL8000, unless the length and/or
conduit runs require that multiple pulls be made. In these instances,
interconnect the individual conductors with suitable terminal blocks.
2.7.5 24BElectrical Grounds
Following are recommendations for electrical grounds:
 A clamp type ground lug is located on the inside bottom front of the
case. Chassis ground conductors (color code green) inside the
DL8000 enclosure should be stranded, insulated, copper wire.
Connect these device chassis ground conductors to the clamp type
ground lug.
 A clamp type ground lug is located on the outside of the case at the
rear of the lower right (facing the operator panel) casting rib.