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Quick Start Guide
Optional transient protection terminal block
The transient protection terminal block can be ordered as an installed option
(option code T1 in the indicator model number) or as a spare part. The spare
part number is 03151-4131-0002. The lightning bolt symbol shown identifies
it as a transient protection terminal block.
Note
The Fieldbus physical layer specification requires indicator communication
during extreme operating conditions of 250 Vrms common mode signal. The
transient terminal block was designed to limit common mode voltages to 90
V and cannot be used in these extreme operating conditions.
1.2
Grounding the indicator case
Always ground the indicator case in accordance with national and local
electrical codes. The most effective indicator case grounding method is a
direct connection to earth ground with minimal impedance. Methods for
grounding the indicator case include:
Internal ground connection
The internal ground connection screw is inside the terminal side of the
electronics housing. The screw is identified by a ground symbol (
standard on the Rosemount 752 Remote Indicators.
External ground assembly
Ground screw is located at the bottom of the mounting bracket.
Note
Grounding the indicator case using the threaded conduit connection may not
provide a sufficient ground. The transient protection terminal block (option
code T1) will not provide transient protection unless the indicator case is
properly grounded. Use the above guidelines to ground the indicator case. Do
not run transient protection ground wire with signal wiring; the ground wire
may carry excessive current if a lightning strike occurs.
6
February 2019
), and is
Rosemount 752
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