Pepperl+Fuchs FieldConnex Segment Coupler 3 User manual

®
PROFIBUS Power Hub
Segment Coupler 3
(SK3)
With HD2-GTR-4PA Gateway
PROCESS AUTOMATION
MANUAL

With regard to the supply of products, the current issue of the following document is ap-
plicable: The General Terms of Delivery for Products and Services of the Electrical Indus-
try, published by the Central Association of the Electrical Industry (Zentralverband
Elektrotechnik und Elektroindustrie (ZVEI) e.V.) in its most recent version as well as the
supplementary clause: "Expanded reservation of proprietorship"
PROFIBUS Power Hub Segment Coupler 3 (SK3)

PROFIBUS Power Hub Segment Coupler 3 (SK3)
3
1 Introduction................................................................................. 5
1.1 Contents................................................................................................ 5
1.2 Target Group, Personnel...................................................................... 5
1.3 Symbols Used ...................................................................................... 5
2 Product Specifications............................................................... 7
2.1 Overview and Application ................................................................... 7
2.2 Coupling................................................................................................ 8
2.3 Segment Supply................................................................................... 9
2.4 System Components ........................................................................... 9
2.5 Recommended System Combinations............................................. 11
2.6 Component Overview ........................................................................ 14
2.7 Technical Data .................................................................................... 15
2.8 Dimensions......................................................................................... 18
3 Installation and Commissioning ............................................. 19
3.1 Mounting and Dismounting............................................................... 19
3.2 Shielding/Grounding ......................................................................... 21
3.2.1 Connection to Equipotential Bonding System .................................. 21
3.3 Connections ....................................................................................... 23
4 Hazardous Area Installation and Use ..................................... 25
4.1 Installation in Zone 2, Category 3G .................................................. 25
5 PROFIBUS Commissioning ..................................................... 26
5.1 Device Address Assignment............................................................. 26
5.2 Cyclic Data Exchange ........................................................................ 26
5.2.1 Information on GSD File Conversion................................................ 27
5.2.2 GSD Converter ................................................................................ 28
5.2.3 Information on Watchdog Time (TWD)............................................. 29
5.2.4 Retry Limits...................................................................................... 31
5.2.5 Device Type Manager (DTM): Installation and Commissioning ........ 31

4
PROFIBUS Power Hub Segment Coupler 3 (SK3)
6 Operation................................................................................... 35
6.1 Built-In Slave (BIS) Description ........................................................35
6.2 Coupled Slaves...................................................................................37
6.3 Acyclic Data Exchange with Built-In Slave via Device Type Manager
37
6.3.1 Brief Introduction to DTM with PACTwareTM (Example)...................38
6.3.2 Overview of the Device Type Manager User Interface......................39
6.3.3 HD2-GTR-4PA Structure Diagrams ..................................................39
6.3.4 Watchdog Time in the Device Type Manager ................................... 40
6.3.5 PROFIBUS PA Retry Limit in the Device Type Manager ................... 41
6.3.6 Restart Functions, Redundancy Switchover, and Firmware Update .41
6.4 Redundant Operation.........................................................................44
7 Advanced Diagnostics with the PROFIBUS Power Hub ....... 46
7.1 Advanced Diagnostics Infrastructure ..............................................46
7.2 PROFIBUS Advanced Diagnostics Integration ................................49
8 Basic Redundancy Concepts .................................................. 51
9 Glossary .................................................................................... 54
10 Parameter Reference List ........................................................ 56
10.1 General Parameters ............................................................................56
10.2 Diagnostic Parameters.......................................................................56
11 Troubleshooting........................................................................ 59
11.1 Faults Indicated via LEDs ..................................................................59
11.2 Fault Indicated via DTM......................................................................60
11.3 Fault Indicated via DCS......................................................................61
11.4 Problems with Gateway Operation....................................................62

PROFIBUS Power Hub Segment Coupler 3 (SK3)
Introduction
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1Introduction
1.1 Contents
This document contains information that you need in order to use your product throughout the
applicable stages of the product life cycle. These can include the following:
■Product identification
■Delivery, transport, and storage
■Mounting and installation
■Commissioning and operation
■Maintenance and repair
■Troubleshooting
■Dismounting
■Disposal
The documentation consists of the following parts:
■Present document
■Instruction manual
■Datasheet
Additionally, the following parts may belong to the documentation, if applicable:
■EU-type examination certificate
■EU declaration of conformity
■Attestation of conformity
■Certificates
■Control drawings
■Additional documents
1.2 Target Group, Personnel
Responsibility for planning, assembly, commissioning, operation, maintenance, and
dismounting lies with the plant operator.
Only appropriately trained and qualified personnel may carry out mounting, installation,
commissioning, operation, maintenance, and dismounting of the product. The personnel must
have read and understood the instruction manual and the further documentation.
Prior to using the product make yourself familiar with it. Read the document carefully.
1.3 Symbols Used
This document contains symbols for the identification of warning messages and of informative
messages.
Note!
This document does not substitute the instruction manual.
Note!
For full information on the product, refer to the instruction manual and further documentation on
the Internet at www.pepperl-fuchs.com.

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PROFIBUS Power Hub Segment Coupler 3 (SK3)
Introduction
Warning Messages
You will find warning messages, whenever dangers may arise from your actions. It is mandatory
that you observe these warning messages for your personal safety and in order to avoid
property damage.
Depending on the risk level, the warning messages are displayed in descending order as
follows:
Informative Symbols
Action
This symbol indicates a paragraph with instructions. You are prompted to perform an action or
a sequence of actions.
Danger!
This symbol indicates an imminent danger.
Non-observance will result in personal injury or death.
Warning!
This symbol indicates a possible fault or danger.
Non-observance may cause personal injury or serious property damage.
Caution!
This symbol indicates a possible fault.
Non-observance could interrupt the device and any connected systems and plants, or result in
their complete failure.
Note!
This symbol brings important information to your attention.

PROFIBUS Power Hub Segment Coupler 3 (SK3)
Product Specifications
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2 Product Specifications
2.1 Overview and Application
Various simplex or redundant Power Hub solutions provide power to PROFIBUS PA segments.
Power Hubs are available for high–power trunk, FISCO, and DART. As part of the Power Hub
system, the PROFIBUS Power Hub Segment Coupler SK3 connects and supplies 4
PROFIBUS PA segments per gateway to PROFIBUS DP in accordance with IEC 61158–2. The
Segment Coupler ensures communication and galvanic isolation between PROFIBUS PA and
PROFIBUS DP.
The Segment Coupler SK3 may be installed in Zone 2 equipment category 3G hazardous
areas. Types of protection are Ex nA (non-sparking) for Zone 2, gas groups IIC, IIB, and IIA.
The SK3 can be used in all system environments that are compliant to industry standard
PROFIBUS DP masters.
The FieldConnex®PROFIBUS Power Hub system has a modular design. A number of possible
combinations is available in order to meet the specific requirements of different explosion
protection concepts or the need for increased segment availability. Functionally, the system can
be divided into 2 types of component categories:
■Coupling components (described in this document)
■Segment supply components (described in the Power Hub manuals)
The following table lists the modules and motherboards and shows in which category they
belong:
Coupling Components Segment Supply Components
Modules
Ga t ew a y m o d u l e H D 2 - G T R - 4 . PA Power supply modules HCD2-FB*
Diagnostic modules HD2-DM*
Motherboards
Gateway motherboard simplex, 
MBHC-FB-4.GT
Gateway motherboard redundant, 
MB-FB-GTR1
Power Hub motherboards simplex or
redundant: 
MBHC-FB-4.HSC, 
MBHC-FB-4R.HSC*
DART Power Hub motherboard redundant:
KT-MB-FB-D-4R.GEN

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PROFIBUS Power Hub Segment Coupler 3 (SK3)
Product Specifications
Various Power Hub power supply solutions offer simplex or redundant power to PROFIBUS PA
segments. The Power Hub consists of a motherboard with sockets for plug-in modules.
■1 power supply module per segment in simplex mode or 2 power supply modules per
segment in redundant mode
■1 physical layer diagnostic module HD2-DM*
The Power Hub feeds segments following the high–power trunk concept for explosion
protection. High energy on the trunk line is fed to the field devices via couplers such as
FieldBarriers or Segment Protectors. A dedicated version of the DART Power Hub supports the
intrinsically safe concept for fieldbus.
Also, a plug-in advanced diagnostic module for fieldbus is available. This module monitors the
physical layer online and in real time, enabling detection of degradation and faults during
operation. Measurement data and alarms are transmitted to the control room. This way, they
make the fieldbus physical layer visible which can now be treated as an active component in
plant asset management systems. Operating personnel are enabled to decide on proactive
measures to avoid unwanted situations while the plant is running smoothly.
2.2 Coupling
Coupling involves a gateway motherboard and 1 or, in the case of redundant coupling,
2 gateway modules. The purpose of coupling is to adjust the physical data transfer properties
on the PROFIBUS DP side (RS–485) to those of PROFIBUS PA (in conformity with
IEC 61158–2). The coupling provides a baud rate of 31.25 kbit/s on the PROFIBUS PA side. In
addition, the coupling generates galvanic isolation between PROFIBUS DP and
PROFIBUS DP
PROFIBUS PA
Power
4 x PA Fieldbus Trunk
Coupling Segment Supply
PROFIBUS Power Hub
Note!
The segment supply is part of the PROFIBUS Power Hub system. For detailed information go
to www.pepperl-fuchs.com and look up to the corresponding documentation of the fieldbus
power supply you installed.

PROFIBUS Power Hub Segment Coupler 3 (SK3)
Product Specifications
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PROFIBUS PA. The DP/PA coupling of the PROFIBUS Power Hub system is functionally
compatible with the Pepperl+Fuchs Segment Coupler 2. The coupling of the PROFIBUS PA
slave to the PROFIBUS DP is transparent. This means that all PA slaves appear on the
PROFIBUS DP bus and are interpreted by the host as PROFIBUS DP slaves. A PROFIBUS DP
address is also assigned to the gateway itself for diagnostic and parameterization purposes.
Cyclic data exchange can be connected redundantly to the PROFIBUS DP line by using the
redundant gateway motherboard MB–FB–GTR1 and 2 HD2-GTR-4PA gateways.
The gateway module HD2-GTR-4PA supports the PROFIBUS flying redundancy (see chapter
8), as well as all non-redundant DP masters. The gateway fulfills the following tasks:
■Conversion of the PROFIBUS DP physical layout to that of PA
■Adjustment of the PROFIBUS DP transfer rate to the PA transfer rate
■Galvanic isolation between PROFIBUS DP and PA
■Elementary functional diagnostics via LEDs
■Ensuring increased availability through redundant coupling of cyclic data exchange (with
redundant layout)
■Acyclic parameterization of gateway parameters by FDT/DTM
■Redundancy diagnostics (with redundant layout)
2.3 Segment Supply
The field devices are supplied with power via power supply modules on a Power Hub
motherboard and via fieldbus lines to the individual segments. The simplex Power Hub version
features 4 power supply slots, the redundant Power Hub version 8 power supply slots.
PROFIBUS PA segments can receive redundant power supplies if a redundant Power Hub
motherboard is used with 2 power supply modules for each segment.
In summary, the segment supply fulfills the following tasks:
■Power supply of field devices: power and communication signal
■Redundant supply for high system availability
■Elementary diagnostic information via LEDs
■Advanced physical layer diagnostics via the HD2-DM* diagnostic module and the
FDT/DTM software package (see corresponding documentation)
2.4 System Components
Motherboards
The following types of motherboards are available:
The gateway motherboard MB-FB-GTR1 has 2 slots for up to 2 HD2-GTR-4PA Segment
Coupler 3 gateway modules. The gateway motherboard is designed for the use with Power Hub
motherboards holding power supply modules supplying PROFIBUS PA segments. The
motherboards are connected with a customized cable that is included in the delivery of the
gateway motherboard. The MB-FB-GTR1 motherboard can also be used with one gateway in
simplex operation. In this case special handling of slave address setting is required. For more
information, see chapter 5.1.
The following versions of power supply motherboards are available:
■MBHC-FB-4.HSC* supports 4 simplex segments, redundant bulk power supply
■MBHC-FB-4R.HSC* supports 4 redundant segments, redundant bulk power supply
■MBHD-FB-D-4R.GEN supports 4 redundant DART intrinsically safe segments, redundant
bulk power supply
For further information refer to the specific product documentation.

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PROFIBUS Power Hub Segment Coupler 3 (SK3)
Product Specifications
The MBHC-FB-4.GT compact motherboard features slots for HD2-GTR-4PA 1 gateway,
4 simplex power supply modules, and 1 diagnostic module.
Ga t e w a y M o d u l e
The Segment Coupler 3 gateway module HD2-GTR-4PA connects 4 PROFIBUS PA segments
to PROFIBUS DP. Together with fieldbus power modules, PROFIBUS PA segments are
supplied directly via fieldbus lines.
Coupling is transparent, so each PA device is addressed and configured as a PROFIBUS DP
device.
The HD2-GTR-4PA module includes 4 PROFIBUS PA masters for time-independent data
transfer.
An FDT/DTM-based PC software is available for the parameterization of the gateway and for
performing several status and diagnostic functionalities.
When used with the respective motherboard, 2 gateways provide redundant coupling. HD2-
GTR-4PA supports the PROFIBUS "flying redundancy" as well as all non-redundant masters.
Fieldbus Power Supply Modules
The fieldbus power supplies supply the PROFIBUS PA segments with power. For different
application requirements, dedicated power supply modules are available:
■HCD2-FBPS-1.500. Output: 30 V at 500 mA with an intrinsically safe limited voltage for
Zone 2 of Uo= 30 V
■HCD2-FBPS-1.23.500. Output: 23 V at 500 mA with an intrinsically safe limited voltage for
Zone 2 of Uo= 24 V
■HD2-FBPS-IBD-1.24.360. Output: 24 V at 360 mA for intrinsically safe (DART) segments
installed in Zone 1
The power supply modules provide full galvanic isolation between the bulk power supply and
the PA segments. The modules offer system reliability for applications where cabling and wiring
are routed through critical or harsh electrical environments, with full protection from
electromagnetic interference (EMI).
Power supply modules are plugged into the motherboard slots and can be exchanged during
system operation. In redundant configuration, load is shared between 2 power supply modules.
Diagnostic Modules
Basic Diagnostic Module
The basic diagnostic module provides basic system diagnostics. It monitors the input voltage
of the bulk power supply and each segment for overload and short circuit conditions. Each
power supply module is checked for proper function. Power supply modules operating in
redundant configuration are checked for compatibility. LEDs indicate both status and fault
information. This information can be transmitted via volt-free contact.
For further information refer to the manual "Basic Diagnostic Module " at www.pepperl-
fuchs.com.
Advanced Diagnostic Module
The advanced diagnostic module is a comprehensive measurement tool for the PROFIBUS PA
physical layer, and supports commissioning, online monitoring, and maintenance tasks. The
module provides the exact segment and individual device data needed for detection of
changes in the fieldbus physical layer. Segment measurements include fieldbus voltage and
load current. Device-specific measurements are signal level, noise, and jitter. All data is
transmitted to the control room via Ethernet. The basic edition of the diagnostic manager

PROFIBUS Power Hub Segment Coupler 3 (SK3)
Product Specifications
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displays all data in an easy-to-use user interface. The professional edition of the diagnostic
manager offers extended software functions: the commissioning wizard generates automated
reports; the software displays clear-text messages for troubleshooting of out-of-specification
behavior. The OPC server transmits user-selectable common alarms to the process control
system.
For further information refer to the manual "Advanced Diagnostic Module " at www.pepperl-
fuchs.com.
2.5 Recommended System Combinations
Simplex Power Feed for 4 Segments with Gateway Redundancy
Figure 2.1 MBHC-FB-4.HSC motherboard for the simplex supply of 4 segments combined with
the MB-FB-GTR1 motherboard and 2 gateway modules HD2-GTR-4PA for redundant
gateway coupling.
The simplex system with a redundant gateway coupling consists of the following components:
■Combined Power Hub gateway motherboard MBHC–FB–4.HSC
■HD2-GTR-4PA* (x 2)
■Power supply modules (x 4)
■Sub-D cable, 9 pins
Optional components:
■Diagnostic module
■Surge protectors TPH-LBF-IA1.36.DE* (x 4)
■Earth bar for surge protectors ACC–LBF–EB.4
PROFIBUS DP
PROFIBUS PA
Power
4 x PA Fieldbus Trunk
Coupling Segment Supply
PROFIBUS
Power Hub

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PROFIBUS Power Hub Segment Coupler 3 (SK3)
Product Specifications
Simplex Power Feed for 4 Segments with Single Gateway
Figure 2.2 MBHC-FB-4.GT* motherboard for the simplex supply of 4 segments amd 1 gateway
module HD2-GTR-4PA for simplex gateway coupling.
The one-board simplex system with single gateway coupling consists of the following
components:
■Combined Power Hub gateway motherboard MBHC–FB–4.GT
■HD2-GTR-4PA* (x 1)
■Power supply modules (x 4)
Optional components:
■Diagnostic module
■Surge protectors TPH-LBF-IA1.36.DE* (x 4)
■Earth bar for surge protectors ACC–LBF–EB.4
PROFIBUS DP
Power
4 x PA Fieldbus Trunk
Coupling Segment Supply
PROFIBUS
Power Hub

PROFIBUS Power Hub Segment Coupler 3 (SK3)
Product Specifications
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Redundant Power Feed for 4 Segments with Gateway Redundancy
Figure 2.3 MBHC-FB-4R.HSC motherboard for the redundant supply of 4 segments combined
with the MB-FB-GTR1 motherboard and 2 gateway modules HD2-GTR-4PA for
redundant gateway coupling.
The redundant system with a redundant gateway coupling consists of the following
components:
■Combined Power Hub gateway motherboard MBHC–FB–4R.HSC
■HD2-GTR-4PA* (x 2)
■Power supply modules (x 8)
■Sub-D cable, 9 pins
Optional components:
■Diagnostic module
■Surge protectors TPH-LBF-IA1.36.DE* (x 4)
■Earth bar for surge protectors ACC–LBF–EB.4
PROFIBUS DP
4 x PA Fieldbus Trunk
Coupling Segment Supply
PROFIBUS
Power Hub
PROFIBUS PA
Power
Note!
Combining a simplex gateway motherboard with a redundant Power Hub motherboard is not
recommended. Since a fault in the coupling of DP to PA results in failure of all 4 segments at
once, but the failure of a single segment does not have any effect on the remaining segments,
increased segment availability can be achieved most easily with redundant coupling.

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PROFIBUS Power Hub Segment Coupler 3 (SK3)
Product Specifications
2.6 Component Overview
Figure 2.4 MB-FB-GTR1* component identity
MB-FB-GTR1* Component Overview
1Motherboard MB-FB-GTR1*
2Gateway HD2-GTR-4PA
3Connections: Volt-free contact alarm and diagnostic bus. 
Diagnostic link cable ACC-MB-HDC, optional accessory
4Sub-D interface for the connection of Power Hub motherboards
5Rotary switches for gateway addressing, x1, x10, x100
6Earth connection
7Mounting slot for DIN mounting rail
7
4
5
3
1
2
6

PROFIBUS Power Hub Segment Coupler 3 (SK3)
Product Specifications
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Figure 2.5 HD2-GTR-4PA component identity
2.7 Technical Data
HD2-GTR-4PA Component Overview
1Quick Lok bar
2LED "PWR":
- Green: Power on
3LED "DP/ERR":
- Red flashing at 2 Hz: DP error
- Red constant: Hardware error
4LED "Redundancy": 
- Yellow constant: Redundancy operation (this gateway module is the primary device)
- Yellow flashing at 2 Hz: Synchronization or redundancy are not available (this gateway
module is the primary device)
- LED off: Single operation (simplex). In redundant mode, this gateway module is the sec-
ondary device
5LED Seg 1 ... Seg 4:
- Red, flashing at 2 Hz: PA error 
- Any segment LED in combination with LED "DP/ERR" on: MAU hardware error
6PROFIBUS DP interface
PROFIBUS
DP/P A
Gateway
HD2-
GTR-
4PA
Seg4
Seg3
Seg2
Seg1
PWR
DP/
ERR
Red.
1
5
1
4
6
3
2
System Overview
Ambient conditions
Ambient temperature -40 ... 60 °C (-40 ... 140 °F)
Storage temperature -40 ... 85 °C (-40 ... 185 °F)
Relative humidity < 95 % non-condensing
Shock resistance 15 g 11 ms
Vibration resistance 1 g , 10 ... 150 Hz
Pollution degree max. 2, according to IEC 60664
Corrosion resistance acc. to ISA-S71.04-1985, severity level G3
Mechanical specifications
Degree of protection IP20
Mounting motherboard mounting

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PROFIBUS Power Hub Segment Coupler 3 (SK3)
Product Specifications
HD2-GTR-4PA
MB-FB-GTR1*
Standard conformity
Electrical isolation IEC 62103
Electromagnetic compatibility NE 21:2011
Degree of protection IEC 60529
Fieldbus standard IEC 61158-2
Shock resistance EN 60068-2-27
Vibration resistance EN 60068-2-6
System Overview
Supply
Rated voltage 19.2 ... 35 V DC
Rated current 160 ... 90 mA
Power dissipation 3 W
Fieldbus interface
PROFIBUS DP
Connection 9-pin Sub-D socket
Protocol PROFIBUS DP V1
Electrical isolation
CH/PROFIBUS DP functional insulation acc. to IEC 62103, rated insulation
voltage 50 Veff
PROFIBUS DP/Supply
CH/CH
All circuits/FE
Data for application in connection with Ex-areas
Statement of conformity TÜV 04 ATEX 2500 X
Group, category, type of
protection, temperature class II 3 G Ex nA IIC T4 Gc
Directive conformity
Directive 94/9/EC EN 60079-0:2012 , EN 60079-11:2012 , EN 60079-
15:2010
International approvals
FM approval CoC 3024816, CoC 3024816C
Approved for Class I, Division 2, Groups A, B, C, D, T4 / Class I, Zone 2,
AEx/Ex nA IIC T4
IECEx approval IECEx TUN 13.0038X
Approved for Ex nA IIC T4 Gc
Supply
Rated voltage 19.2 ... 35 V SELV/PELV
Rated current 2 ... 3 A
Indicators/operating means
System Overview

PROFIBUS Power Hub Segment Coupler 3 (SK3)
Product Specifications
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Fault signal VFC alarm output via connectors
Rotary switch bus addressing, gateway-specific
Data for application in connection with Ex-areas
Statement of conformity TÜV 15 ATEX 7735 X
Group, category, type of
protection, temperature class II 3 G Ex ec IIC T4 Gc
Directive conformity
Directive 94/9/EC EN 60079-0:2012 , EN 60079-7:2015 , EN 60079-11:2012
International approvals
IECEx approval IECEx TUR 16.0007X
Approved for Ex ec IIC T4 Gc
Accessories
ACC-MB-HDC Diagnostic link cable, length 6 cm
ACC–MB–HGC Sub-D cable, 9 pins for connecting the gateway
motherboard and Power Hub motherboard. Included in the
delivery of gateway motherboards.
Overview of Ordering Information
HD2–GTR–4PA Gateway module for 4 PROFIBUS PA segments
MB-FB-GTR1 Motherboard for gateway redundancy, slots for 2 gateway
modules with removable screw terminals
MB-FB-GTR1.1 Motherboard for gateway redundancy, slots for 2 gateway
modules with removable spring terminals

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PROFIBUS Power Hub Segment Coupler 3 (SK3)
Product Specifications
2.8 Dimensions
Figure 2.6 All dimensions in millimeters and without tolerance indication.
Component Dimensions
39 mm
166 mm
135 mm
150 mm

PROFIBUS Power Hub Segment Coupler 3 (SK3)
Installation and Commissioning
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3 Installation and Commissioning
In the following section you find information on how to install and commission the device in your
fieldbus topology.
3.1 Mounting and Dismounting
Danger!
Explosion hazard from exposure to potentially explosive gas atmosphere
If the device is installed in Zone 2 without mounting it in a sufficiently suitable enclosure, gas,
dust, water or other external interferences can cause the live device to spark. The sparks can
ignite the surrounding potentially explosive atmosphere.
Only mount the device in an enclosure with degree of protection IP54 according to
IEC/EN 60529. The enclosure must have an EU declaration of conformity according to the
ATEX Directive for at least equipment category 3G.
Danger!
Explosion hazard from exposure to potentially explosive dust atmosphere
If the device is installed in Zone 22 without mounting it in a sufficiently suitable enclosure, dust,
water or other external interferences can cause the live device to spark. The sparks can ignite
the surrounding potentially explosive atmosphere.
Only mount the device in a suitable enclosure. The enclosure must have an EU declaration of
conformity according to the ATEX Directive for at least equipment category 3D.
Danger!
Explosion hazard from live wiring
If you connect or disconnect energized non-intrinsically safe circuits in a potentially explosive
atmosphere, sparks can ignite the surrounding atmosphere.
Only connect or disconnect energized non-intrinsically safe circuits in the absence of a
potentially explosive atmosphere.
Note!
Read the instruction manual first!
Before you install and commission this product: Read the instruction manual for this product
carefully. Make sure you have understood all information that is relevant for your application.
Danger!
Danger to life from wrong mounting and installation
Incorrect mounting and installation of the device can compromise its function and its electrical
safety.
■Observe the safety instruction in the instruction manual.
■Observe the information in the manual.

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PROFIBUS Power Hub Segment Coupler 3 (SK3)
Installation and Commissioning
Mounting of Fieldbus Motherboards on DIN Mounting Rail
In order to mount a motherboard on a DIN mounting rail, proceed as follows:
1. Place the motherboard on the DIN mounting rail.
2. Tighten the two fastening screws to attach the motherboard on the DIN mounting rail.
The motherboard has been mounted.
Mounting Plug-In Modules on the Motherboard
To install a new plug-in module on the motherboard, proceed as follows:
1. Carefully center the polarization holes and mate the 2 connectors, then gently press down
the module.
2. Push down the red Quick Lok bars on each side of the module to fix it to the panel. No tools
required.
The new module has been installed.
Dismounting Modules from the Motherboard
To dismount a module from the motherboard, proceed as follows:
Pull up the red Quick Lok Bars on each side of the module and carefully lift off the entire
module.
The module has been removed from the motherboard.
Danger!
Explosion hazard from damaged electronic components
Premature wear of electronic components in a device that was previously used in a general
electrical installation can cause sparks that can ignite the surrounding potentially explosive
atmosphere.
Never install devices that have already been operated in general electrical installations in
electrical installations used in combination with hazardous areas!