Type 8791

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Table of contents

1. General technical data

4

1.1.

Positioner SideControl Type 8791....................................................................................................................................................4

1.2.

Without fieldbus communication .....................................................................................................................................................5

1.3.

With fieldbus communication: AS-Interface ....................................................................................................................................6

1.4.

With digital communication: IO-Link................................................................................................................................................6

1.5.

With digital communication: Bürkert system bus (büS)...................................................................................................................6

1.6.

Linear remote position sensor (ELEMENT Type 8798).....................................................................................................................7

1.7.

Rotative remote position sensor (NAMUR) ......................................................................................................................................7

1.8.

Position feedback with proximity switches (accessories for retrofitting) .........................................................................................8

2. Approvals and conformities

9

2.1.

General notes...................................................................................................................................................................................9

2.2.

Conformity .......................................................................................................................................................................................9

2.3.

Standards.........................................................................................................................................................................................9

2.4.

Explosion protection ........................................................................................................................................................................9

Positioner SideControl Type 8791....................................................................................................................................................9

2.5.

North America (USA/Canada) ..........................................................................................................................................................9

Positioner SideControl Type 8791....................................................................................................................................................9

Linear position sensor, remote (ELEMENT Type 8798)....................................................................................................................9

Rotative position sensor, remote (NAMUR Type 8798)....................................................................................................................9

2.6.

Others ............................................................................................................................................................................................10

China Compulsory Certification (CCC) ..........................................................................................................................................10

3. Dimensions

11

3.1.

NAMUR/Remote Version ...............................................................................................................................................................11

3.2.

Mounting specification of NAMUR/Remote version ......................................................................................................................12

NAMUR version .............................................................................................................................................................................12

Remote version ..............................................................................................................................................................................13

3.3.

ATEX/IECEx version .......................................................................................................................................................................13

3.4.

Remote position sensor version ....................................................................................................................................................14

3.5.

Mounting on control valve according to NAMUR ..........................................................................................................................14

4. Device/Process connections

15

4.1.

Electrical connections....................................................................................................................................................................15

Multipole connection......................................................................................................................................................................15

AS-Interface connection ................................................................................................................................................................16

Position feedback with proximity switches....................................................................................................................................17

Cable gland....................................................................................................................................................................................17

IO-Link connection.........................................................................................................................................................................19

Connection of digital remote position sensor Type 8798, M8 socket, 4-pin (optional) .................................................................19

Bürkert system bus (büS) connection............................................................................................................................................19

Connection of digital remote position sensor Type 8798, M8 socket, 4-pin (optional) .................................................................19

5. Performance specifications

21

5.1.

Signal flow diagram........................................................................................................................................................................21

Position control loop ......................................................................................................................................................................21

Additional software options of positioner SideControl Type 8791 (extract)...................................................................................21

5.2.

Interface diagram ...........................................................................................................................................................................22

Version without fieldbus communication .......................................................................................................................................22

Version with fieldbus communication ............................................................................................................................................22