Remote Display Wiring And Power Up - Emerson Rosemount 3051S Series Reference Manual

Rosemount 3051S Series
Remote Display Wiring
and Power Up
2-18
Electrical Considerations
Proper electrical installation is necessary to prevent errors due to improper
grounding and electrical noise. For Junction Box housing, shielded signal
wiring should be used in high EMI/RFI environments.
The Remote Mount Display and Interface system consists of a local
transmitter and a remote mount LCD display assembly. The local 3051S
transmitter assembly includes a Junction Box housing with a three position
terminal block integrally mounted to a SuperModule. The remote mount LCD
display assembly consists of a dual compartment PlantWeb housing with a
seven position terminal block. See Figure 2-10 on page 2-19 for complete
wiring instructions. The following is a list of necessary information specific to
the Remote Mount Display system:
• Each terminal block is unique for the remote display system.
• A 316 SST housing adapter is permanently secured to the remote
mount LCD display PlantWeb housing providing an external ground
and a means for field mounting with the provided mounting bracket.
• A cable is required for wiring between the transmitter and remote
mount LCD display. The cable length is limited to 100 ft.
• 50 ft. (option M8) or 100 ft. (option M9) cable is provided for wiring
between the transmitter and remote mount LCD display. Option M7
does not include cable; see recommended specifications below:
Cable type: Recommend Belden 3084A DeviceNet cable or Belden 123084A
Armored DeviceNet cable. Other comparable cable may be used as long as it
has independent dual twisted shielded pair wires with an outer shield. The
Power wires must be 22 AWG minimum and the CAN communication wires
must be 24 AWG minimum.
Cable length: Up to 100 ft. depending upon cable capacitance.
Cable capacitance: The capacitance from the CAN communications line to
the CAN return line as wired must be less than 5000 picofarads total. This
allows up to 50 picofarads per ft. for a 100 ft. cable.
Intrinsic Safety Consideration: The transmitter assembly with remote
display has been approved with Belden 3084A DeviceNet cable. Alternate
cable may be used as long as the transmitter with remote display and cable is
configured according to the installation control drawing or certificate. Refer to
appropriate approval certificate or control drawing in Appendix B for remote
cable IS requirements.
IMPORTANT
Do not apply power to the remote communications terminal. Follow wiring
instructions carefully to prevent damage to system components.
IMPORTANT
For ambient temperatures above 140 °F (60 °C), cable wiring must be rated at
least 9 °F (5 °C) above the maximum ambient temperature.
Reference Manual
00809-0100-4801, Rev EA
August 2010