Emerson Rosemount 752 Quick Installation Manual

Quick Installation Guide

Step 1:Wiring Connection
Step 2: Configure the Transducer Block
Product Certification

Star t

End

00825-0100-4377, Rev BA
October 2010

Rosemount 752

Rosemount 752 Remote Indicator with

OUNDATION

F

™

fieldbus Protocol

¢00825-0100-4377J¤

www.rosemount.com

Quick Installation Guide

IMPORTANT NOTICE

WARNING

00825-0100-4377, Rev BA

Rosemount 752

© 2010 Rosemount Inc. All rights reserved. All marks property of owner. Rosemount and the Rosemount logotype are
registered trademarks of Rosemount Inc.

Rosemount Inc.

8200 Market Boulevard
Chanhassen, MN USA 55317
T (US) [phone]
T (Intnl) [phone]
F [phone]

This installation 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 (document number 00809-0100-4377) for more instruction. This manual is also
available electronically on www.rosemount.com.

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. Please review the approvals section
of the Rosemount 752 reference manual for any restrictions associated with a safe installation.

• Before connecting a Fieldbus-based communicator in an explosive atmosphere, make sure the
instruments in the loop 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.

October 2010

2

Quick Installation Guide

STEP 1: WIRING CONNECTION

See Safety Messages page 2 for complete warning information.

00825-0100-4377, Rev BA
October 2010

Rosemount 752

Wiring for FOUNDATION fieldbus protocol

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
indicator.

2. Connect the power leads to the terminals marked “FIELDBUS WIRING” as shown in
Figure 1. 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. If you do not seal unused connections, mount the
indicator with the electrical housing positioned downward for drainage. Install wiring with
a drip loop. 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 poser terminals are rated to 32 Vdc.

Figure 1. Fieldbus terminal block

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 F

Power Supply

The indicator requires between 9 and 32 Vdc (9 and 15 V dc for FISCO) to operate and
provide complete functionality. The dc power supply should provide power with less than 2%
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 can not be grounded. Grounding out one of the signal
wires will shut down the entire 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.

OUNDATION fieldbus.

3

Rosemount 752

Power

Supply

Terminators

Integrated Power

Conditioner

and Filter

(Trunk)

(Spur)

(Spur)

(The power supply, filter, first

terminator, and configuration tool

are typically located in the control

room.)

Fieldbus
Segment

6234 ft (1900 m) max

(depending upon cable

characteristics)

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

fieldbus devices

on segment

FOUNDATION

fieldbus

Configuration

Tool

Signal
Wiring

Figure 2. FOUNDATION fieldbus indicator field wiring

Quick Installation Guide

00825-0100-4377, Rev BA

October 2010

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 V
designed to limit common mode voltages to 90 V and cannot be used in these extreme
operating conditions.

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
( ), and is standard on the 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.

4

common mode signal. The transient terminal block was

rms