Emerson Rosemount 3051P, Справочное руководство, Страница: 53 / 110

43
Reference Manual
00809-0700-4001, Rev AA
Electrical Installations
May 2017
Electrical Installations
Transmitter case grounding
Always ground the transmitter case in accordance with national and local electrical codes. The most
effective transmitter case grounding method is a direct connection to earth ground with minimal
impedance. Methods for grounding the transmitter case include:

Internal ground connection: the internal ground connection screw is inside the FIELD TERMINALS side
of the electronics housing. This screw is identified by a ground symbol ( ). The ground connection
screw is standard on all Rosemount 3051P Transmitters. Refer to Figure 4-8 on page 43 .

External ground connection: The external ground connection is located on the exterior of the
transmitter housing. Refer to Figure 4-8 on page 43 . This connection is only available with option T1.
Figure 4-8. Internal Ground Connection
A. Internal ground location
B. External ground location
C. Positive
D. Negative
E. Test
Note
Grounding the transmitter case via threaded conduit connection may not provide sufficient ground
continuity.
Transient protection terminal block grounding
The transmitter can 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.
The transient protection terminal block can be ordered as an installed option (Option Code T1) or as a
spare part to retrofit existing Rosemount 3051P Transmitters in the field. See
“Ordering information” on
page 74 for part numbers. The lightning bolt symbol shown in Figure 4-9 on page 44 identifies the
transient protection terminal block.
C
D
E
A
B