Eaton 9372-FB-P Series User manual

9372-FB-Px-xx
5-spur redundant fieldbus barrier
November 2016
INM 9370-RD Rev 5
Instruction manual
MTL fieldbus networks

INM 9370-RD Rev 5
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DECLARATION OF CONFORMITY
A printed version of the Declaration of Conformity has been provided separately within the original shipment of goods.
However, you can find a copy of the latest version at http://www.mtl-inst.com/certificates

INM 9370-RD Rev 5 1
CONTENTS
DECLARATION OF CONFORMITY . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . II
GENERAL SAFETY INFORMATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2
1 OVERVIEW ........................................................................3
2 DESCRIPTION ......................................................................4
2.1 General ................................................................................4
2.2 Configuration options ....................................................................4
2.3 Trunk Terminal Assembly ..................................................................5
3 MECHANICAL INSTALLATION.........................................................5
3.1 Mounting overview ......................................................................5
3.2 Preparation .............................................................................7
3.3 Mounting...............................................................................7
4 INITIAL ELECTRICAL INSTALLATION ...................................................8
4.1 Overview ...............................................................................8
4.2 Grounding ..............................................................................8
4.3 Trunk connections ......................................................................11
4.4 Trunk Terminator module 9378-FT. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .13
4.5 Trunk Surge module 9376-SP .............................................................13
4.6 Spur connections .......................................................................13
4.7 Blanking Plugs .........................................................................14
4.8 Final Checks ...........................................................................15
5 MAINTENANCE ...................................................................15
5.1 General ...............................................................................15
5.2 Fieldbus Barrier maintenance procedures ...................................................15
5.3 Terminator and Trunk Surge Protection modules .............................................17
5.4 Spur connections .......................................................................18
5.5 Trunk connections ......................................................................19
5.6 Regular Maintenance checks. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .19
6 TROUBLESHOOTING ...............................................................20
7 ALARM MODULE - OPERATION & CONFIGURATION .....................................22
7.1 Introduction. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .22
7.2 Device details ..........................................................................22
7.3 Alarm module fitting or replacement.......................................................24
8 ATEX INFORMATION ...............................................................25
8.1 General ...............................................................................25
8.2 Installation ............................................................................25
8.3 Inspection and maintenance .............................................................25
8.4 Repair ................................................................................26
8.5 Marking ...............................................................................26
9 APPENDIX 1 - ENCLOSURE WIRING DIAGRAM. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .27

INM 9370-RD Rev 5
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GENERAL SAFETY INFORMATION
Safety instructions for installation and operating personnel
The operating instructions provided here contain essential safety instructions for installation personnel
and those engaged in the operation, maintenance and servicing of the equipment.
WARNING!
Failure to comply with these instructions can endanger the lives or health of
personnel and risk damage to the plant and the environment.
WARNING!
The responsibility for planning, installation, commissioning, operation and
maintenance, particularly with respect to applications in explosion-hazard areas,
lies with the plant operator.
Before commencing installation or commissioning:
• Read and understand the contents of this manual
• Ensure installation and operating personnel have received adequate training for this task
• Ensure that any operating instructions are fully understood by the personnel responsible.
• Observe national and local installation and mounting regulations (e.g. IEC 60079-14).
WARNING!
These assemblies may not be used in explosion-hazard area applications if they
have been used previously in general electrical installations.
During operation:
• Make the relevant instructions available at all times to the operating personnel.
• Observe safety instructions.
• Observe national safety and accident prevention regulations.
• Operate the equipment within its published specification.
• Servicing, maintenance work or repairs not described in this manual must not be performed without
prior agreement with the manufacturer.
• Any damage to this equipment may render its explosion protection null and void.
• No changes to any of the components that might impair their explosion protection are permitted.
If any information provided here is not clear:
• Contact Eaton’s MTL product line or one of its representatives.
Note: Improper installation and operation of the enclosure can result in the invalidation of the guarantee.
CAUTION
Earlier models of the Fieldbus Barrier Module (9377-FB) that do not have the “-R” at the
end of the model number cannot be used in the produbts described here.
A mechanical interlock prevents their being fitted to the carriers. Do not attempt to fit
these models as damage to the carrier may result.

INM 9370-RD Rev 5 3
1 OVERVIEW
This manual explains the installation and maintenance procedures for the
9372-FB-xx-yy Redundant Fieldbus Barrier enclosures and must be read in association
with the product datasheets that contain the electrical data.
The 9372-FB-xx-yy Redundant Fieldbus Barriers are field-mounted wiring hubs that create
five (or six*) intrinsically safe spur connections from a high-energy trunk, for connection
to suitably certified Foundation™ fieldbus H1 instruments.They may be installed in
Zone 1 (gas) or Zone 21 (dust) hazardous areas, with the trunk wiring implemented using
suitably protected cable and increased safety (Ex e) connection facilities.
Each enclosure system uses a pair of Fieldbus Barrier modules in a “redundant spur“
configuration to achieve significantly higher system availability than equivalent ‘simplex’
units.The 9372-FB-xx-yy may therefore be selected for critical process applications where
failure of the Fieldbus Barrier would otherwise result in unacceptable downtime or lost
production. It is also ideal for use in Fieldbus Safety Instrumented Function (SIF) networks
in which nuisance trips cannot be tolerated. Failure annunciation to the host control
system is provided by means of an integrated Foundation™ fieldbus device with Digital
Input Function Block capability.
The enclosure options are: electrochemically polished 316 stainless steel or glass-reinforced
plastic (GRP) and either may be installed in a Zone 1 or Zone 2 hazardous area.
The following enclosure types are available by ordering the appropriate model number.
9372-FB-Px-yy 5-spur Redundant Fieldbus Barrier enclosure
9375-FB-Px-yy 6-spur Redundant-ready Fieldbus Barrier enclosure
Where Px = PS (pluggable screw terminal connectors) or
PC (pluggable spring clamp connectors)
and yy = SS (316L stainless steel enclosure) or
PP (GRP enclosure- black)
* See section 2.2
937X-FB-Px-yy Redundant Fieldbus Barrier
5-spur enclosures
Figure 1.1 - Example of model 9372-FB-XX-SS

INM 9370-RD Rev 5
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2 DESCRIPTION
2.1 General
The standard models comprise a stainless steel or GRP, increased safety, Ex e
enclosure, containing a trunk-wiring terminal assembly (TTA), two carrier-mounted
fieldbus barriers and a fieldbus alarm module.
Each barrier module can convert a single, non-intrinsically safe fieldbus trunk into
six, galvanically isolated, intrinsically safe (IS) spur connections for connection to
Foundation™ fieldbus H1 fieldbus instruments. However, only six spurs are available
at any one time because they are configured as “redundant pairs”. On power-up the
spurs in one barrier are configured to be in “active” mode, while the spurs in the
other barrier remain in “standby”. In the event of a spur circuit failure in the “active”
barrier module, an automatic switchover ensures that the external spur field circuit
continues to be supported by the corresponding spur in the “standby” module.
Figure 2.1 illustrates an example where Module A - on the left- is the active barrier
and Module B the standby. Spurs 1,2, 4, 5 and 6 of Module A are shown as active
(‘A’) but spur 3 has failed (and effectively gone into standby) so module B has
automatically taken control of spur 3 (‘A’) to maintain full service to the affected field
circuit.
++++++

Spur Electronics Spur Electronics
= Active
S= Standby
0V 0V







     

SS SSS
AlarmAlarm
S



Figure 2.1 - Redundant spurs block diagram + optional alarm module
The spurs are galvanically isolated from the trunk allowing the user to choose the
type of grounding scheme most suitable to their system.
Spur short-circuit protection is provided by the barrier and surge protection can
also be added on individual outgoing spurs by the use of individual Spur Surge
protection modules (part no. FS32).
2.2 Configuration options
There are six spur outputs from each barrier and, as described above, these can
operate in a redundant fashion, supporting each other to maintain continuous
availability for field spur devices. However, if a spur “fails-over” to the other barrier,
the situation might go undetected without frequent inspection of the status of the
barrier LEDs. For this reason, a “failure-reporting” configuration is provided, where
Spur 6 is assigned to an internally located Alarm Module (model 9379-ALM) -
see Figure 2.1.

INM 9370-RD Rev 5 5
Consequently, if a spur ‘fail-over’ occurs, an alarm is signalled quickly to the host,
via the fieldbus connection, to facilitate any necessary remedial action.The five
remaining spurs are available to the user for connection to field devices.
Note: A redundant-capable version of the 9372-FB-Px-yy can also be supplied,
part-populated with a single 6-spur module (order as model number 9375-FB-Px-
yy).This permits a future upgrading from the simplex mode to a redundant mode
simply by plugging in an additional Fieldbus Barrier module- and the optional alarm
module, if required.
2.3 Trunk Terminal Assembly
The incoming trunk wiring is terminated inside a separate compartment, called the
TrunkTerminal Assembly (TTA), that contains increased safety (Ex e) trunk wiring
terminals.This assembly has a protective cover to deter interference, and carries a
warning to the user about working on trunk wiring without first isolating the power.
A fieldbusTerminator module (part no. 9378-FT) is supplied pre-fitted on theTTA.This
is to remain installed if the enclosure is at the end of the segment. If the incoming
fieldbus trunk will be onward linked to a further node on the segment the terminator
can be removed. See Section 4.4 on page 13 for additional information.
An optionalTrunk Surge module (part no. 9376-SP) can be plugged into theTTA to
protect the fieldbus barrier against damaging voltage and current surges on the
incoming trunk wiring.
Either enclosure may be installed in a Zone 1 or Zone 2 hazardous area; in which
case, the trunk wiring must be implemented using suitably protected cable.The
enclosures provide excellent chemical and moisture resistance and are suitable for
use in a wide range of corrosive environments.
The 9372-FB-Px-yy and 9375-FB-Px-yy Fieldbus Barrier enclosures are bus-powered
and require no additional power supply in the field. When used with a fieldbus host
control system, power for the trunk MUST be provided only by a supply conforming
to IEC 61158-2, e.g. MTL F800 or 918x range of redundant power supplies.The
enclosures are supplied pre–drilled for all trunk and spur cable entries and fitted
with Ex e certified blanking plugs and a breather.
3 MECHANICAL INSTALLATION
See Figures 3.1 and 3.2 for the dimensions, fixing locations and cable gland
positions for both enclosure models.
3.1 Mounting overview
Before mounting an enclosure, consider the following points.
a) The permitted ambient temperature range external to the enclosure (–40°C to
+70°C) must not be exceeded. Avoid radiant heat by locating the enclosure away
from direct sunlight or local sources of heat.
b) The enclosure has an ingress protection rating of IP65 or IP66 (to EN60529)
depending on the manufacturing date. The mounting location should be chosen
to comply with the rating of the enclosure.
c) The enclosure is designed for mounting on a vertical surface, with the cable
entry at the lowest point, as shown in the upper part of Figure 3.1 or Figure 3.2.
d) The nominal weight of the individual enclosures, including two barrier modules,
but excluding any surge protection modules (trunk or spur) is:
Model type Nominal weight
Stainless steel enclosure 8.0 kg
GRP enclosure 7.8 kg
e) Adequate security should be provided against unauthorised interference.

INM 9370-RD Rev 5
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Figure 3.1 - External dimensions and mounting hole positions for the stainless steel enclosure
Figure 3.2 - External dimensions and mounting hole positions for the GRP enclosure

INM 9370-RD Rev 5 7
a) All the necessary gland holes have been prepared in the enclosure. One has
a breather fitted and the others are fitted with appropriate blanking plugs.
Where the blanking plugs are replaced by cable gland, the fitted glands must
be Ex e certified and have an ingress protection (IP) rating that maintains the
overall rating of the enclosure.
b) All cable gland holes must be fitted with either a suitable cable gland or
blanking plug.
CAUTION
It is not permitted to create additional holes in the enclosure as this would violate
the certification.
3.2 Preparation
a) Remove any temporary protection or packing materials.
b) The enclosure can be mounted on any suitable structure using the
enclosure’s integral mounting brackets.
c) The fixing bolts must be suitable for the mounting surface and the
environmental conditions.
d) Prepare holes in the mounting surface, on the centres shown in Figure 3.1 or
3.2, to accept suitable screws/bolts for mounting.
e) It is advisable before mounting, to do any necessary replacement of the
cable entry blanking plugs with a suitable gland. For further details see
Section 3.1 f) & g).
3.3 Mounting
WARNING!
To minimise the risk of ignition by electrical apparatus in hazardous
areas, efficient installation, inspection and maintenance of apparatus
and systems is essential, and the work should be carried out by suitably
trained personnel in accordance with the prevailing code of practice.
The certification documents specify “Conditions for safe use” that
must be adhered to and the copy certificate supplied should be
studied and understood. Additionally it is recommend that a working
knowledge of IEC EN 60079 -14 be attained, as this standard provides
guidance in respect to the installation of electrical equipment in
hazardous areas.
3.3.1 The SS enclosure
It is suggested that the upper two fixing bolts have washers fitted before
screwing them into prepared holes to a depth that will allow the enclosure to be
safely hung on them.The enclosure can then be supported on these top bolts
while the lower fixings are put in place. Finally, all fixings can be tightened to
the torque level recommended by their manufacturer.
3.3.2 The GRP enclosure
It is recommended that a washer, not exceeding the 12mm diameter specified in
Figures 3.1 and 3.2, is placed under the head of each of the bolts used to fix the
enclosure to its mounting surface.
NOTE!
It is important to recognise that the hole centres for the middle fixings on the GRP
enclosure are NOT aligned with the holes for the end fixings.
Study Figure 3.2 for full details.
It is suggested that the lower fixings should be put in place first, so that the
enclosure can be supported by them while the upper fixings are put in place.

INM 9370-RD Rev 5
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After mounting the enclosure
Check that:
• it has not suffered any damage,
• the IP rating is not affected; for example, by distortion of the enclosure,
• the mounting bolts/nuts are all tightened as recommended above.
4 INITIAL ELECTRICAL INSTALLATION
WARNING!
Before starting any electrical installation work, ensure that the
incoming trunk connection is isolated from any source of power.
CAUTION
The temperature inside the enclosure could rise to 75°C. Ensure that all cables and
cable glands fitted are rated to withstand these temperatures.
4.1 Overview
Captive screws are used to secure the lid. Loosen these screws to obtain entry.
CAUTION
The lid of the stainless steel enclosure is connected to the enclosure body with a
protective grounding cable.
DO NOT leave the lid hanging by this link cable while work is carried out!
• The enclosure receives power from the incoming trunk cable and requires no
further source of power.
• The equipment shall only be powered from supplies conforming to IEC 61158.
• Type ‘A’ fieldbus cable is recommended for fieldbus trunk connections.
• The terminal blocks for the trunk fieldbus cables have either screw terminal
connectors or cage clamp connectors according to the enclosure model
specified, but both are suitable for cables from 0.5mm2/AWG 20 up to 2.5mm2/
AWG 14.
On completion of installation, check all blanking plugs and cable glands are tightened
to ensure IP rating of the enclosure is maintained.
Details of the internal wiring for the two enclosure types is provided in Appendix 1.
4.2 Grounding
Two distinct ground concepts should be recognised before wiring of the enclosure
begins:
a) Protective local ground- mandatory
b) Cable shield ground
These two concepts and their implementation are explained below.
4.2.1 Protective local ground
This ground connection is required to ensure that any exposed metalwork in, or
on, the enclosure does not present a hazard to personnel; it also provides a low
impedance earth grounding circuit for any surge protection items used in the
enclosure. An external M10 earth-grounding stud is provided on the side wall of the
enclosure to enable a connection to be made to the local ground.
Use a ring terminal to make a good quality, plant safety-earth connection (4mm2
cross-sectional area or better) to this bolt and tighten it to a recommended torque of
5Nm.
Note: It is important to prevent this connection from loosening and also to protect it
from corrosion against the stainless steel grounding stud.
4.2.2 Cable shield ground
The enclosures can be configured by the user to either of two grounding methods.The
user should adopt the one that conforms to their system’s normal grounding method.