Pepperl+Fuchs NCN3-F31K2 Series Manuel utilisateur

ISO9001

Functional Safety

Inductive Dual Sensor

NCN3-F31K2(M)-N*-B*3-S

FACTORY 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 NCN3-F31K2(M)-N*-B*3-S

Content

2019-11

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 Safe. . . . . . . . . . . . . . . . . . . . 8

3 Planning . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9

3.1 System Structure. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9

3.2 Assumptions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10

3.3 Safety Function and Safe State . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11

3.4 Characteristic Safety Values . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12

3.5 Useful Lifetime . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13

4 Mounting and Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14

4.1 Mounting. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14

4.2 Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14

4.3 Configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14

5 Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15

5.1 Proof Test . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15

6 Maintenance and Repair . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16

7 List of Abbreviations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17

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Functional Safety NCN3-F31K2(M)-N*-B*3-S

Introduction

1 Introduction

1.1 Content of this Document

This document contains safety-relevant information for usage of the device.

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!

For full information on the product, refer to the further documentation on the Internet

at www.pepperl-fuchs.com.

Functional Safety NCN3-F31K2(M)-N*-B*3-S

Introduction

2019-11

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 NCN3-F31K2(M)-N*-B*3-S

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 NCN3-F31K2(M)-N*-B*3-S

Product Description

2019-11

2 Product Description

2.1 Function

General

The device is an inductive dual sensor. Dual sensors are used, for example, to detect the final

positions of valve positions in valve actuators.

Inductive dual sensors consist of 2 sensor circuits arranged one above the other.

Each sensor has its own coil. If a measuring plate is inside the sensing range of one

of the coils, the magnetic field of the coil is influenced and an electrical switching signal

is generated.

The device is a NAMUR sensor with 2 independent sensor circuits in 2-wire configuration.

The device transmits the binary signal according to NAMUR to a connected control unit.

A control unit can, e. g., be a switch amplifier or an I/O card in a PLC.

NCN3-F31K2(M)-N4-B*3-S

The sensor has two separate sensor circuits with NC function (normally-closed).

The device is in high impedance state when a measuring plate is located within the sensing

range of the respective sensor circuit.

The sensor has a rated operating distance sn of 3 mm.

NCN3-F31K2-N5-B*3-S

The sensor has two sensor circuits. One sensor circuit of these sensor circuits is activated

depending on the polarity of the supply voltage. The active sensor circuit is in high impedance

state when a measuring plate is located within the sensing range of this sensor circuit.

The sensor has a rated operating distance sn of 3 mm.

2.2 Interfaces

The device has the following interfaces.

• Safety relevant interface: device output

• Non-safety relevant interface: none

Note

See corresponding datasheets for further information.

Note

For corresponding connections see datasheet.

2019-11

Functional Safety NCN3-F31K2(M)-N*-B*3-S

Product Description

2.3 Marking

2.4 Standards and Directives for Functional Safe

Device-specific standards and directives

Pepperl+Fuchs Group

Lilienthalstraße 200, 68307 Mannheim, Germany

Internet: www.pepperl-fuchs.com

NCN3-F31K2-N4-B13-S

NCN3-F31K2-N4-B33-S

NCN3-F31K2M-N4-B13-S

NCN3-F31K2M-N4-B23-S

NCN3-F31K2-N5-B13-S

NCN3-F31K2-N5-B33-S

Up to SIL 2

Functional safety IEC/EN 61508, part 1 –2, edition 2010:

Functional safety of electrical/electronic/programmable electronic

safety-related systems (manufacturer)

Functional Safety NCN3-F31K2(M)-N*-B*3-S

Planning

2019-11

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:

• the PFDavg 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:

• the PFH value (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.

2019-11

Functional Safety NCN3-F31K2(M)-N*-B*3-S

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 safety-related device is considered to be of type A device with a hardware fault

tolerance of 0.

• 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

Only use the device in SIL 2 applications in combination with a control unit according

to EN 60947-5-6 (NAMUR).

• The device claims less than 25 % 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 1 x 10-2,

hence the maximum allowable PFDavg value would then be 2.5 x 10-3.

• For a SIL 2 application operating in high demand mode the total PFH value

of the SIF should be smaller than 1 x 10-6 per hour, hence the maximum allowable

PFH value would then be 2.5 x 10-7 per hour.

• Since the safety loop has a hardware fault tolerance of 0 and it is a type A device,

the SFF must be > 60 % according to table 2 of IEC/EN 61508-2 for a SIL 2 (sub) system.

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