Pepperl+Fuchs KFD2-ELD-Ex16 Manuale utente

ISO9001

Functional Safety

Ground Fault Detection

KFD2-ELD-(Ex)16

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 KFD2-ELD-(Ex)16

Content

2017-09

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. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7

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. . . . . . . . . . . . . . . . . . . . . . . . . . . 10

3.5 Useful Life Time . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11

4 Mounting and Installation . . . . . . . . . . . . . . . . . . . . . . . . 12

4.1 Configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12

5 Operation. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13

5.1 Proof Test Procedure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13

6 Maintenance and Repair . . . . . . . . . . . . . . . . . . . . . . . . . 14

7 List of Abbreviations . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15

Functional Safety Manual HiD2872, HiC2873(Y1), HiD2876, HiC2877

2017-09

Functional Safety KFD2-ELD-(Ex)16

Introduction

1 Introduction

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:

•Presentdocument

• 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 functional safety products from Pepperl+Fuchs 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 KFD2-ELD-(Ex)16

Introduction

2017-09

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.

2017-09

Functional Safety KFD2-ELD-(Ex)16

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 KFD2-ELD-(Ex)16

Product Description

2017-09

2ProductDescription

2.1 Function

General

The device detects ground faults on field lines.

The 16 channels of the device continuously monitor galvanically isolated circuits

and warns if their resistance to ground falls below 10 k.

During an alarm condition, the appropriate channel LED is illuminated and the

change-over contact is initiated (S1 = position I). The function of this relay can be

reversed with switch S1 (S1 = position II).

A self-test can be activated via the test input of the device. The device reacts by

switching the relay. The self-test can be triggered manually by the user or

remotely by the control system.

A fault is signalized by LEDs and a separate collective error message output.

If the device is operated via Power Rail, additionally a collective error message is

available.

The device is mounted on a 35 mm DIN mounting rail according to EN 60715.

KFD2-ELD-16

This signal conditioner provides the galvanic isolation between field circuits and

control circuits.

KFD2-ELD-Ex16

This isolated barrier is used for intrinsic safety applications.

2.2 Interfaces

The device has the following interfaces:

• Safety relevant interfaces: inputs 1 to 16

• Non-safety relevant interfaces: outputs 1 to 16 and supply

Note!

For corresponding connections see datasheet.

Functional Safety KFD2-ELD-(Ex)16

2017-09

Functional Safety KFD2-ELD-(Ex)16

Product Description

2.3 Marking

2.4 Standards and Directives for Functional Safety

Device-specific standards and directives

System-specific standards and directives

Pepperl+Fuchs GmbH

Lilienthalstraße 200, 68307 Mannheim, Germany

Internet: www.pepperl-fuchs.com

KFD2-ELD-16, KFD2-ELD-Ex16

Functional safety IEC/EN 61508, part 2, 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 KFD2-ELD-(Ex)16

Planning

2017-09

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 T

value (proof test interval that has a direct impact on the PFD

avg

value)

•theSFFvalue(Safe Failure Fraction)

•theHFTarchitecture(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

•theSFFvalue(Safe Failure Fraction)

•theHFTarchitecture(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 = (

+ 

) / (

+ 

)

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.

Functional Safety KFD2-ELD-(Ex)16

2017-09

Functional Safety KFD2-ELD-(Ex)16

Planning

3.2 Assumptions

The following assumptions have been made during the FMEDA:

• Failure rate based on the Siemens standard SN29500.

• 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, which

are comparable with the classification "stationary mounted" in MIL-HDBK-

217F. Alternatively, the following ambient conditions are assumed:

• IEC/EN 60654-1 Class C (sheltered location) with temperature limits in the

range of the manufacturer's specifications and an average temperature of

40 ºC over a long period. The humidity level is within manufacturer's rating.

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.

3.3 Safety Function and Safe State

The device itself does not have a safety function. But in the case of failure, the

device can influence a connected safety loop.

The device can be used in conjunction with safety loops up to SIL 3. For the

SFF calculation, the failure rate of the device is added to the failure rate of the

safety loop. See chapter 3.4

3.4 Characteristic Safety Values

If a safety loop contains a KFD2-ELD-(Ex)16 device, the values of the device

must be added to the values of this safety loop.

The configuration of the device has no influence on the safety characteristic

values. There are no further failures that have a negative effect on the connected

safety loop.

Parameters acc. to IEC 61508 Characteristic values



0.002 FIT

PFH 2 x 10

-12

1/h

PFD

avg

for T

= 1 year 8.76 x 10

-9

Table 3.1

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