Betriebsanleitung Ausgabe 06/01

SIWAREX IS

Equipment Manual Release 06/01

Product Overview

SIWAREX IS 23 J31069-D0614-U001-A0-0018

Table of Contents

1. Product Overview......................................................25

1.1. General....................................................................25

1.2. Design .....................................................................27

2. Installation ................................................................28

2.1. Assembly.................................................................28

2.2. Contact Positions .....................................................29

2.3. Equipotential Bonding................................................30

2.4. Wiring and Maintenance............................................312.4.1. 2.4.1 Connection Notes...................................312.4.2. Cable Shields.................................................322.4.3. Connection of a Load Cell................................322.4.4. Connection of Several Load Cells .....................352.4.5. Service/Maintenance.......................................35

3. Technical Data ..........................................................37

4. Dimensioned Drawing...............................................41

5. Order Data.................................................................42

6. Certificates................................................................43

24 SIWAREX ISJ31069-D0614-U001-A0-0018

Product Overview

SIWAREX IS 25 J31069-D0614-U001-A0-0018

1. Product Overview

1.1. General

SIWAREX IS is a safety barrier and represents theinterface between the system components located in thehazardous area and the safe area.The device is designed especially for the special requi-rements of industrial weight and force measurements.The Ex i interface is switched between the "electronicfeed and evaluation unit" and the sensing elements toconnect force and pressure sensors located within thehazardous area.SIWAREX IS allows 6 lines to be connected to a load cell(feeder line, feedback line, test leads) as intrinsically safe"e" type wires [EEx ib] IIC.Adherence to and compliance with all applicablestandards and regulations is certified by the EC type-examination certificate (TÜV 01 ATEX 1722 X).

DangerThe safety of the EX area depends onthis device!Only qualified personnel may performthe necessary connection andinstallation tasks.Compliance with the applicableinstallation rules and regulations ismandatory (EN60079-14 and forGermany VDE0165 Part 1).The device has to be installed outsideof the hazardous area.Nonobservance of the assembly and

26 SIWAREX ISJ31069-D0614-U001-A0-0018

installation instructions results in anEXPLOSION HAZARD!

Note Qualified personnel are individuals whoare familiar with the installation,assembly, initial startup, and operationof the product and who possess theskills required by their respectiveactivities, e.g.: Training or instructionsor authorization to work on electriccircuits of facilities and systems withan explosion risk.

For the equipotential bonding process, SIWAREX IS hasto always be connected with the equipotential bondingconductor or potential equalization line (PAL).

The potential equalization line is connected to theSIWAREX IS via the provided EX protected shield clamp.

Potential equalization line and ground may be connectedonly once at the central grounding location of the building.Any other connection is unacceptable.

Product Overview

SIWAREX IS 27 J31069-D0614-U001-A0-0018

1.2. Design

SIWAREX IS allows for the realization of 6 safetybarriers.

The two supply lines feature 2 voltage limitations and 2active current limitations each.The test leads and the feedback lines feature 2 voltagelimitations and a passive current limitation each.

Fig. 2.1 Block Diagram

(passiv)

(passiv)

Schirm Schirm

Bereicheigensicher

'Signal -

'Signal +

'Sense -

'Sense +

'Exc -

'Exc +

Signal -

Signal +

Sense -

Sense +

Exc -

Exc +

leitungenMesswert-

leitungenRückführungs-

leitungenVersorungs-

4

5

6

(aktiv)

Strombe-

Strombe-

Strombe-

3

2

1

begrenzung

begrenzung

begrenzung

Spannungs-

Spannungs-

Spannungs-

Schutzleiter (PE) Potentialausgleichsleiter (PAL)

grenzung

grenzung

grenzung

Keine Verbindung zu PAL!

Input

2 x

2 x

2 x

2 x

1 x

1 x

Output

Voltagelimitation

Voltagelimitation

Voltagelimitation

Currentlimitation(active)

Currentlimitation(active)

Currentlimitation(passiv)

Shield Shield

Supply lines

Feedbacklines

Testlines

Equipmentgroundingconductor (PE)

Intinsicallysafe area

Potential equalization line (PAL)

28 SIWAREX ISJ31069-D0614-U001-A0-0018

2. Installation

Important Notes• Only qualified personnel may perform the necessarytasks.• Comply with the ESD rules and guidelines when

handling the SIWAREX IS.• Comply with the Siemens installation rules and

guidelines RFA 2.5 as well as the EN 50 020 rulesand guidelines!

• See technical data for ambient temperature atinstillation location.

2.1. Assembly

The device has to be installed outside of the hazardousarea within an electrical cabinet.A vertical fitting position according to Fig. 2.1 is required.SIWAREX IS is snapped onto to a 35 mm standard baraccording to EN 50 022.

A junction box is required to connect several load cells.The case of the junction box has to be insulated whenattached if it is not guaranteed that the mounting basecarried the potential of the potential equalization line andthe distance between SIWAREX IS and load cell is longerthan 50 m.Use an insulating installation plate when attaching theunit as part of an insulated installation. The insulationvoltage amounts to 500 V!

Installation

SIWAREX IS 29 J31069-D0614-U001-A0-0018

2.2. Contact Positions

Install SIWAREX IS as depicted in Fig. 2.1. The contactsfor the safe area are at the top, those for the intrinsicallysafe area and the PAL connection at the bottom (adifferent installation requires the appropriate contactchanges). The contact positions are coded to preventcables being confused if the cable case is properlyconnected.

Fig. 2.2 Equipment Connectors

Bereichsicherer

Bereicheigens.Ex i

LED

PWRPAL

Typenschild

6

654321

54321

Anschluss für WägezellePAL-Anschluss

Anschluss für Speise- und Auswerteelektronik

X6

X4 hellblaugekennzeichnet

PAL Connection Load Cell Connection

Type Plate

markedlight blue

intrins.savearea

safearea

X6

30 SIWAREX ISJ31069-D0614-U001-A0-0018

2.3. Equipotential Bonding

For the equipotential bonding process, SIWAREX IS hasto always be connected with the equipotential bondingconductor or potential equalization line (PAL)!The connecting line has to have a copper cross-sectionof 1.5 mm². Potential equalization line and ground maybe connected only once at the central grounding locationof the building. Any other connection is unacceptable.

The potential equalization line is connected to theSIWAREX IS via the provided EX-protected shield clamp.

Note Neither the shield of the line leading tothe "electronic feed and evaluation unit"nor any other component con-nectedwith the grounding conductor (PE) maybe connected to the case of theSIWAREX IS.The standard bar on which theSIWAREX IS is mounted has to beconnected with the potential equaliza-tion line (PAL).

Installation

SIWAREX IS 31 J31069-D0614-U001-A0-0018

2.4. Wiring and Maintenance

2.4.1. Connection Notes

A special "EX load cell cable" (blue) has to be used forthe intrinsically safe circuits (connection of SIWAREX ISwith load cell).

The load cell cable within the intrinsically safe area has tobe able to withstand a testing voltage of at least

500 V.

Jacks with a cable case are provided for the X4 and X6pin-and-socket connectors. The cable case serves thestrain relied of the connected conductors. The strainrelief of the cable with a diameter of 4 to 13.5 mm uses aclamp or cable tie. The jacks are suitable for conduc-torcross-sections of 0.08 to 1.5 mm2. The jacks featureinterlocks. These interlocks ensure that the cable casesare vibration-free and firmly connected with the pincontact strips. Just press on the lateral flanges to detachthe cable cases.

Notes ESD NotesThe following is recommended toimprove the interference immunity:• Install signal cables separately from

cables with high voltages andcurrents.

• Avoid proximity to large electricsystems and equipment.

• Use shielded cables.

32 SIWAREX ISJ31069-D0614-U001-A0-0018

2.4.2. Cable Shields

The shield for the signal lines between "electronic feedand evaluation unit" and SIWAREX IS is placed on thePE potential on both sides.

The shield for the signal lines between SIWAREX IS andthe load cells is installed on PAL in close proximity to theEx i interface. PAL (potential equalization lines) is usedas shield potential.

If the shield may not be applied with connecting lines, theblank end of the shield is to be isolated with shrinkdownplastic tubing. (ESD resistance not guaranteed!)

2.4.3. Connection of a Load Cell

A load cell can be directly connected on the lower plugconnection.The load cells can be connected using a 4-conductor or6-conductor technique..The 6-conductor technique has to be used betweenevaluation electronics and SIWAREX IS.

The voltage drops of the lines between SIWAREX IS andthe load cell cannot be detected id the 4-conductortechnique is used, which leads to additional measuringerrors.

Installation

SIWAREX IS 33 J31069-D0614-U001-A0-0018

Fig. 2.4 Load cell with 4-conductor connection

SenseMeas.Feed

Um:Use:Us+:

SIWAREX IS

grgnrtwsswbl

Um-Um+Us-Us+

-

-

+

+

654321

PAL Connect.

PAL

Shield

Shield

1 2 3 4 5 6

gr gn rt ws sw bl

Use-Use+ Um-Um+Us-Us+

To feed & eval. unit

Shield bar

PE

34 SIWAREX ISJ31069-D0614-U001-A0-0018

Fig. 2.5 Load cell with 6-conductor connection

The 6-conductor technique has to be applied if- Line lengths between Ex i interface and load cell exceed20 meters- A junction box is used.

Meas.SenseFeed

Um:Use:Us+:

SIWAREX IS

grgnrtwsswbl

Use-Use+Um-Um+Us-Us+

-

-

+

+

654321

PAL Connect.

PAL

Shield

Shield

1 2 3 4 5 6

gr gn rt ws sw bl

Use-Use+ Um-Um+Us-Us+

To feed & eval. unit

Shield bar

PE

Installation

SIWAREX IS 35 J31069-D0614-U001-A0-0018

2.4.4. Connection of Several Load Cells

The junction box (JB) is to be used of several load cellsare to be parallel connected to the measurement system.The connection between junction box and SIWAREX ISuses an Ex load cell cable.

Load cells may be placed parallel only if the have thesame characteristic quantity, the same nominal load, andthe same internal resistance. The total resistance of theparallel connection is dependent on the type of SIWAREXSI (see technical data).Fig. 2.5 depicts the complete connection schemata fromthe weighing electronics to the load cells.

2.4.5. Service/MaintenanceThe device does not require any maintenance. If thedevice requires servicing, please send it to the repairlocation since only the factory is authorized to performrepairs.

36 SIWAREX ISJ31069-D0614-U001-A0-0018

Sense

SignalExcitation

SIWAREX ..

SIMATIC- shield attachment

save area

Wägezelle(n)load cell(s)

junction box

4 or 6 wiresshield

hazardous area

PAL

potential equallisation

Ex iLED

PWRPAL X4

654321

Ex i - InterfaceSIWAREX IS

654321

23 4

X

PE

PE

Fig. 2.6 Connecting several load cells via junktion box

load cell(s)

Technical Data

SIWAREX IS 37 J31069-D0614-U001-A0-0018

3. Technical Data

Technical Data

Not Intrinsically SafeCircuits

SIWAREX ISStandard Version

SIWAREX ISLow-Current Design

Type7MH4 710-5BA

Type7MH4 710-5CA

Weighing accuracy inconnection with:SIWAREX U 0.05 % (3000 d) 0.05 % (3000 d)SIWAREX M,SIWAREX A

0.01 % (6000 d) 0.01 % (6000 d)

SIWAREX P 0.10 % 0.10 %

Load Cell FeedNominal Voltage Un1 DC 10 V DC 10 VPermissible TouchPotential

AC 250 V AC 250 V

Internal Load CellResistance

> 87 Ω > 180 Ω

(Total) < 4010 Ω < 4010 Ω

Sense LeadNominal Voltage Un2 DC 10 V DC 10 VPermissible TouchPotential

AC 250 V AC 250 V

Test LeadNominal Voltage Un3 DC 10 mV to

40 mVDC 10 mV to40 mV

Permissible TouchPotential

AC 250 V AC 250 V

Intrinsically SafeCircuits

Load Cell FeedNo-Load Voltage U01 < DC 13.1 V < DC 13.1 V

38 SIWAREX ISJ31069-D0614-U001-A0-0018

< DC 6.05 Vagainst PAL

< DC 6.05 Vagainst PAL

Fault Current I01 < DC 120 mA < DC 58 mA

Sense LeadNo-Load Voltage U02 < DC 14.4 V < DC 14.4 V

< DC 7.2 Vagainst PAL

< DC 7.2 Vagainst PAL

Fault Current I02 < DC 25 mA < DC 25 mA

Test Data LeadNo-Load Voltage U03 < DC 12.8 V < DC 12.8 V

< DC 6.4 Vagainst PAL

< DC 6.4 Vagainst PAL

Fault Current I03 < DC 54 mA < DC 54 mA

Total Connected Load(When InterconnectingCircuits)No-Load Voltage U0 < DC 14.4 V < DC 14.3 VFault Current I0 < DC 199 mA < DC 137 mAPower P0 < DC 1835 mW < DC 1025 mW

For Gas Group II CHighest PermissibleOuter Inductivity La

0.15 mH 0.5 mH

Highest PermissibleOuter Capacity Ca

500 nF 450 nF

For Gas Group II BHighest PermissibleOuter Inductivity La

1 mH 2 mH

Highest PermissibleOuter Capacity Ca

2000 nF 2000 nF

Technical Data

SIWAREX IS 39 J31069-D0614-U001-A0-0018

General DataPermissible AmbientTemp.- During Operation -10°C to 60°C -10°C to 60°C- During Operation forIndustrial Scales

-10°C to 40°C -10°C to 40°C

- During Transport andStorage

-40°C to 85°C -40°C to 85°C

Permissible Rel.Humidity

< 95 % < 95 %

Case Dimensions See DimensionedDrawing

See DimensionedDrawing

Weight 500 g 500 gSystem of Protection IP 20 IP 20

PermitsEC Type-ExaminationCertificate No.

TÜV 01 ATEX1722 X

TÜV 01 ATEX1722 X

Type of Protection "e" Intrinsic Safety "i" Intrinsic Safety "i"II (2) G [EEx ib] II C II (2) G [EEx ib] II C

FM/CSA Certification in preparation in preparation

Calibration Permit(PTB Test Certificate)According to

EN45501, OIML R76-1, 90/384/EWG

EN45501, OIMLR76-1, 90/384/EWG

Permissible Cable Lengths

Type 7MH4 710-5BACable length in Ex area with Excables110 pF/ 60 pF, 1 µH per meter (up-and-down line)

Gas Group IIC 150 mGas Group IIB 1000 m

Type 7MH4 710-5CA

40 SIWAREX ISJ31069-D0614-U001-A0-0018

Cable length in Ex area with Excables110 pF/ 60 pF, 1 µH per meter (up-and-down line)

Gas Group IIC 546.81 ydGas Group IIB 1000 m

The information concerning the total cable lengths in therespective equipment descriptions of the evaluation electronicsare to be considered as well.

Electromagnetic CompatibilityResistance to jamming according to EN 61326 / 1999 andNAMUR NE21 / 1998. (Burst ± 700 V performance criteria A)Radio shielding according to EN 50 081-1 tolerance class B.

Mechanical Operating Conditions

SIWAREX IS is designed only for the following mechanicaloperating stresses.

Vibratory Stresses According toIEC 68068-2-6

9.81 m/s2

Impact Stress According toIEC 68068-2-27

150 m/s2; 11ms

Accessories:Cable case, model WAGO, consisting of the following:

Item Order No.Multiple Contact Strip 734-206Case 734-636Cable Clamp 209-177Screws 209-176

Dimensioned Drawing

SIWAREX IS 41 J31069-D0614-U001-A0-0018

4. Dimensioned Drawing

PAL-Anschluss

105

75 141

Bereichsicherer

Bereicheigens.Ex i

LED

PWRP A L

Typenschild

6

6

5

5

4

4

3

3

2

2

1

1

ca. 50 mm für Biegeradiusfür Kabelabgang vorsehen

PAL-connection

42 SIWAREX ISJ31069-D0614-U001-A0-0018

5. Order Data

Designation Order No.Ex i interface for SIWAREX IS with ashort circuit current of < DC 199 mA

7MH4 710-5BA

Ex i interface for SIWAREX IS with ashort circuit current of < DC 137 mA

7MH4 710-5CA

Ex load cell cable, blue(shielded 6 * 0.75 mm² )

7MH4 702-8AA

Connection "feed and evaluationelectronics" -Ex i interface SIWAREX IS, gray(shielded 6 * 0.75 mm² )

7MH4 702-8AB

Junction box for several load cells MH4 710-1BA

Certificates

SIWAREX IS 43 J31069-D0614-U001-A0-0018

6. Certificates

44 SIWAREX ISJ31069-D0614-U001-A0-0018

Certificates

SIWAREX IS 45 J31069-D0614-U001-A0-0018

46 SIWAREX ISJ31069-D0614-U001-A0-0018

SIEMENS AGBereich Automatisierungs- und AntriebstechnikWägesystem SIWAREXA&D PI 14D-76181 Karlsruhe

Siemens Aktiengesellschaft

© Siemens AG 2001Änderungen vorbehalten

Bestell-Nr.: J31069-D0614-U001-A0-7418Printed in the Federal Republic of Germany