Reference Manual
00809-0100-4801, Rev FA
October 2010
Rosemount 3051S Series
2-16
Connect Wiring and
Power Up
Use twisted pairs to yield best results. To ensure proper communication, use
24 AWG to 14 AWG wire, and do not exceed 5000 feet
(1 500 meters).
Figure 2-8. HART Terminal
Blocks
To make connections, perform the following procedure:
1. Remove the housing cover on terminal compartment side. Do not
remove the cover in explosive atmospheres when the circuit is live.
Signal wiring supplies all power to the transmitter.
2. Connect the positive lead to the terminal marked (+) and the negative
lead to the terminal marked (pwr/comm –). Avoid contact with leads and
terminals. Do not connect powered signal wiring to the test terminals.
Power could damage the test diode.
3. Plug and seal the unused conduit connection on the transmitter housing
to avoid moisture accumulation in the terminal side. Install wiring with a
drip loop. Arrange the drip loop so the bottom is lower than the conduit
connections and the transmitter housing.
Surges/Transients
The transmitter will withstand electrical transients of the energy level
usually encountered in static discharges or induced switching transients.
However, high-energy transients, such as those induced in wiring from
nearby lightning strikes, can damage the transmitter.
Optional Transient Protection Terminal Block
The transient protection terminal block can be ordered as an installed
option (Option Code T1 in the transmitter model number) or as a spare
part to retrofit existing 3051S transmitters in the field. For a complete
listing of spare part numbers for transient protection terminal blocks, refer
to page A-38. A lightning bolt symbol on a terminal block identifies it as
having transient protection.
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