Pepperl+Fuchs KFD0-CS 50 Series User manual

ISO9001
2
Functional Safety
Current Driver/Repeater
KFD0-CS-(Ex)*.50(P),
KFD0-CS-(Ex)*.51(P)*
PROCESS AUTOMATION
MANUAL

With regard to the supply of products, the current issue of the following document is applicable:
The General Terms of Delivery for Products and Services of the Electrical Industry, 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"
Functional Safety KFD0-CS-(Ex)*.50(P), KFD0-CS-(Ex)*.51(P)

Functional Safety KFD0-CS-(Ex)*.50(P), KFD0-CS-(Ex)*.51(P)
Content
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1 Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
1.1 Content of this Document. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
1.2 Safety Information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
1.3 Symbols Used . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
2 Product Description. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
2.1 Function . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
2.2 Interfaces . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
2.3 Marking . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
2.4 Standards and Directives for Functional Safety . . . . . . . . . . . . . . . . . . 8
3 Planning . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
3.1 System Structure. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
3.2 Assumptions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
3.3 Safety Function and Safe State . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
3.4 Characteristic Safety Values . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
3.5 Useful Lifetime . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
4 Mounting and Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
4.1 Configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
5 Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
5.1 Proof Test . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
6 Maintenance and Repair . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
7 List of Abbreviations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18

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Functional Safety KFD0-CS-(Ex)*.50(P), KFD0-CS-(Ex)*.51(P)
Introduction
1Introduction
1.1 Content of this Document
This document contains information for usage of the device in functional safety-related
applications. You need this information 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
•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
• FMEDA report
• Assessment report
• Additional documents
For more information about Pepperl+Fuchs products with functional safety,
see www.pepperl-fuchs.com/sil.
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.

Functional Safety KFD0-CS-(Ex)*.50(P), KFD0-CS-(Ex)*.51(P)
Introduction
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1.2 Safety Information
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.
Intended Use
The device is only approved for appropriate and intended use. Ignoring these instructions
will void any warranty and absolve the manufacturer from any liability.
The device is developed, manufactured and tested according to the relevant safety standards.
Use the device only
• for the application described
• with specified environmental conditions
• with devices that are suitable for this safety application
Improper Use
Protection of the personnel and the plant is not ensured if the device is not used
according to its intended use.

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Functional Safety KFD0-CS-(Ex)*.50(P), KFD0-CS-(Ex)*.51(P)
Introduction
1.3 Symbols Used
This document contains symbols for the identification of warning messages and
of informative messages.
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.

Functional Safety KFD0-CS-(Ex)*.50(P), KFD0-CS-(Ex)*.51(P)
Product Description
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2 Product Description
2.1 Function
KFD0-CS-*.50
This signal conditioner provides the galvanic isolation between field circuits and control
circuits.
The device can be used as a repeater or transmitter power supply for 2-wire transmitters.
The device is loop powered. From the control side no additional power supply has
to be connected.
Use the technical data to verify that proper voltage is available to the field devices.
The device is mounted on a 35 mm DIN mounting rail according to EN 60715.
KFD0-CS-Ex*.50(P)
This isolated barrier is used for intrinsic safety applications.
The device can be used as a repeater or transmitter power supply for 2-wire transmitters.
The device is loop powered. From the control side no additional power supply has
to be connected.
Use the technical data to verify that proper voltage is available to the field devices.
The device is mounted on a 35 mm DIN mounting rail according to EN 60715.
P Version
A reverse polarity protection prevents damage to the device caused by faulty wiring.
KFD0-CS-*.51(P)
This signal conditioner provides the galvanic isolation between field circuits
and control circuits.
The device transfers DC signals of fire alarms and smoke alarms from the field side
to the control side. The device can also be used to control I/P converters, valves, indicators,
and audible alarms.
The device is loop powered. From the control side no additional power supply has
to be connected.
Use the technical data to verify that proper voltage is available to the field devices.
The device is mounted on a 35 mm DIN mounting rail according to EN 60715.
P Version
A reverse polarity protection prevents damage to the device caused by faulty wiring.

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Functional Safety KFD0-CS-(Ex)*.50(P), KFD0-CS-(Ex)*.51(P)
Product Description
KFD0-CS-Ex*.51(P)
This isolated barrier is used for intrinsic safety applications.
The device transfers DC signals of fire alarms and smoke alarms from the hazardous area
to the non-hazardous area. The device can also be used to control I/P converters, valves,
indicators, and audible alarms.
The device is loop powered. From the control side no additional power supply has
to be connected.
Use the technical data to verify that proper voltage is available to the field devices.
The device is mounted on a 35 mm DIN mounting rail according to EN 60715.
P Version
A reverse polarity protection prevents damage to the device caused by faulty wiring.
2.2 Interfaces
The device has the following interfaces.
• Safety-relevant interfaces:
• 1-channel devices: input I, output I
• 2-channel devices: input I, input II, output I, output II
• Non-safety-relevant interfaces: none
2.3 Marking
2.4 Standards and Directives for Functional Safety
Device specific standards and directives
System-specific standards and directives
Note!
For corresponding connections see datasheet.
Pepperl+Fuchs GmbH
Lilienthalstraße 200, 68307 Mannheim, Germany
Internet: www.pepperl-fuchs.com
KFD0-CS-1.50, KFD0-CS-2.50, KFD0-CS-2.51P
KFD0-CS-Ex1.50P, KFD0-CS-Ex2.50P, KFD0-CS-Ex1.51P,
KFD0-CS-Ex2.51P
Up to SIL 2
Functional safety IEC/EN 61508, part 1 –7, edition 2010:
Functional safety of electrical/electronic/programmable
electronic safety-related systems (manufacturer)
Functional safety IEC/EN 61511, part 1 –3, edition 2003:
Functional safety –Safety instrumented systems
for the process industry sector (user)

Functional Safety KFD0-CS-(Ex)*.50(P), KFD0-CS-(Ex)*.51(P)
Planning
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3 Planning
3.1 System Structure
3.1.1 Low Demand Mode of Operation
If there are two control loops, one for the standard operation and another one for the
functional safety, then usually the demand rate for the safety loop is assumed to be less
than once per year.
The relevant safety parameters to be verified are:
•thePFD
avg value (average Probability of dangerous Failure on Demand) and the
T1value (proof test interval that has a direct impact on the PFDavg value)
• the SFF value (Safe Failure Fraction)
• the HFT architecture (Hardware Fault Tolerance)
3.1.2 High Demand or Continuous Mode of Operation
If there is only one safety loop, which combines the standard operation and safety-related
operation, then usually the demand rate for this safety loop is assumed to be higher
than once per year.
The relevant safety parameters to be verified are:
•thePFHvalue(Probability of dangerous Failure per Hour)
• Fault reaction time of the safety system
• the SFF value (Safe Failure Fraction)
• the HFT architecture (Hardware Fault Tolerance)
3.1.3 Safe Failure Fraction
The safe failure fraction describes the ratio of all safe failures and dangerous detected failures
to the total failure rate.
SFF = (s+ dd) / (s+ dd + du)
A safe failure fraction as defined in IEC/EN 61508 is only relevant for elements or (sub)systems
in a complete safety loop. The device under consideration is always part of a safety loop
but is not regarded as a complete element or subsystem.
For calculating the SIL of a safety loop it is necessary to evaluate the safe failure fraction
of elements, subsystems and the complete system, but not of a single device.
Nevertheless the SFF of the device is given in this document for reference.

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Functional Safety KFD0-CS-(Ex)*.50(P), KFD0-CS-(Ex)*.51(P)
Planning
3.2 Assumptions
The following assumptions have been made during the FMEDA:
• Failure rate based on the Siemens standard SN 29500.
• Failure rates are constant, wear is not considered.
• External power supply failure rates are not included.
• The device will be used under average industrial ambient conditions comparable
to the classification "stationary mounted" according to MIL-HDBK-217F.
Alternatively, operating stress conditions typical of an industrial field environment similar
to IEC/EN 60654-1 Class C with an average temperature over a long period of time
of 40 ºC may be assumed. For a higher average temperature of 60 ºC, the failure rates
must be multiplied by a factor of 2.5 based on experience. A similar factor must be used
if frequent temperature fluctuations are expected.
SIL 2-Application
• The device shall claim less than 10 % of the total failure budget for a SIL 2 safety loop.
• For a SIL 2 application operating in low demand mode the total PFDavg value
of the SIF (Safety Instrumented Function) should be smaller than 10-2, hence
the maximum allowable PFDavg value would then be 10-3.
• For a SIL 2 application operating in high demand mode the total PFH value
of the SIF should be smaller than 10-6 per hour, hence the maximum allowable PFH value
would then be 10-7 per hour.
• The safety-related device is considered to be of type Adevice with a hardware fault
tolerance of 0.
• Since the safety loop has a hardware fault tolerance of 0and it is a type Adevice,
the SFF must be > 60 % according to table 2 of IEC/EN 61508-2 for a SIL 2 (sub) system.
3.3 Safety Function and Safe State
Safety Function
The device transfers current signals from the input to the output with a maximum tolerance
of 5 % related to the full signal range.
Safe State
In the safe state the output is < 3.6 mA.
Reaction Time
The reaction time for all safety functions is < 20 ms.
Note!
See corresponding datasheets for further information.