Rosemount Quick Start Guide: Rosemount 751 Remote Indicator with FOUNDATION™ Fieldbus Protocol Manuals & Guides

Quick Start Guide

00825-0100-4377, Rev FB

Rosemount™ 752 Remote Indicator

with FOUNDATION™ Fieldbus Protocol

April 2021

Quick Start Guide April 2021

Safety messages

This guide provides basic guidelines for Rosemount 752 Remote Indicator. It does not provide
instructions for configuration, diagnostics, maintenance, service, troubleshooting, Explosion-proof,
Flameproof, or intrinsically safe (I.S.) installations. Refer to the Rosemount 752 Reference Manual for
more instruction. This manual is also available electronically on Emerson.com/Rosemount.

WARNING

Explosions could result in death or serious injury.

Installation of this indicator in an explosive environment must be in accordance with the appropriate
local, national, and international standards, codes, and practices. Review the Product Certifications
section for any restrictions associated with a safe installation.

• Before connecting a communicator in an explosive atmosphere, ensure the instruments in the

segment are installed in accordance with intrinsically safe or non-incendive field wiring practices.

• In an explosion-proof/flameproof installation, do not remove the indicator cover when power is

applied to the unit.

Electrical shock can result in death or serious injury.

• Avoid contact with the leads and terminals. High voltage that may be present on leads can cause

electrical shock.

Conduit/cables entries

• Unless marked, the conduit/cable entries in the housing use a ½–14 NPT thread form. Entries

marked “M20” are M20 × 1.5 thread form. On devices with multiple conduit entries, all entries will
have the same thread form. Only use plugs, adapters, glands, or conduit with a compatible thread
form when closing these entries.

• When installing in a hazardous location, use only appropriately listed or Ex certified plugs, glands,

or adapters in cable/conduit entries.

Contents

Wiring connection........................................................................................................................3

Configure the transducer block.................................................................................................... 7

Product Certification.................................................................................................................... 9

Declaration of Conformity..........................................................................................................16

China RoHS................................................................................................................................ 19

2 Rosemount 752

April 2021 Quick Start Guide

1 Wiring connection

1.1 Wiring for FOUNDATION™ Fieldbus protocol

1. Remove the housing cover on terminal compartment side.

Note

Do not remove the cover in explosive atmospheres when the circuit
is live. Signal wiring supplies all power to the indicator.

2. Connect the power leads to the terminals marked “FIELDBUS
WIRING” as shown in Figure 1-1.

Note

The power terminals are not polarity sensitive.

3. Plug and seal unused conduit connections on the indicator housing
to avoid moisture accumulation in the terminal side.

a. If you do not seal unused connections, mount the indicator

with the electrical housing positioned downward for
drainage.

b. Install wiring with a drip loop.

c. Arrange the drip loop so the bottom is lower than the conduit

connections and the indicator housing.

Note

Do not apply high voltage (e.g. ac line voltage) to the indicator terminals.
Abnormally high voltage can damage the unit. Indicator terminals are rated
to 32 Vdc.

Figure 1-1: Fieldbus Terminal Block

Quick Start Guide 3

Quick Start Guide April 2021

Electrical considerations

Proper electrical installation is necessary to prevent errors due to improper
grounding and electrical noise. Shielded, twisted pair cable should be used
for best results in electrically noisy environments. Cable type A is
recommended by FOUNDATION™ Fieldbus protocol.

Power supply

The indicator requires between 9 and 32 Vdc (9 and 15 Vdc for FISCO) to
operate and provide complete functionality. The dc power supply should
provide power with less than two percent ripple.

Power conditioner

A Fieldbus segment requires a power conditioner to isolate the power
supply, filter, and decouple the segment from other segments attached to
the same power supply.

Grounding

Signal wiring of the Fieldbus segment cannot be grounded. Grounding out
one of the signal wires will shut down the entire FOUNDATION™ Fieldbus
segment.

Shield wire ground

To protect the Fieldbus segment from noise, grounding techniques for
shield wire usually require a single grounding point for shield wire to avoid
creating a ground loop. The ground point is typically at the power supply.

4 Rosemount 752

I

J

H

H

F

B

C

D

E

A

G

April 2021 Quick Start Guide

Figure 1-2: FOUNDATION Fieldbus Indicator Field Wiring

Intrinsically safe installations may allow fewer devices per I.S. barrier due to
current limitations.

A. Power supply
B. Integrated power conditioner and filter
C. 6234 ft. (1900 m) max (depending upon cable characteristics)

D. Terminators

E. Fieldbus segment

F. Trunk
G. FOUNDATION™ Fieldbus configuration tool
H. Spur

I. Signal wiring
J. Fieldbus devices on segment

(1)

(1) The power supply, filter, first terminator, and configuration tool are typically located

in the control room.

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Quick Start Guide April 2021

Surges/transients

The indicator 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 indicator.

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 Rosemount 752

), and is