Beijer Electronics BoX2 pro Installation Manual

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Page 1

BoX2pro

InstallationManual

English

MAEN275,2018-03

Page 2

Page 3

Foreword

Installationmanual forBoX2pro

Foreword

All operator panelsare developed to satisfy the demands of human-machine communication. Built-in functions such as displaying and controlling text, dynamic indication, time channels, alarm and recipe handling are included.

The operator panel works primarily in an object-oriented way, making it easy to understand and use. Conﬁguration is carried out on a PC using iX Developer software. The project can then be transferred and stored in the operator panel itself.

Various types of automation equipment such as PLCs, servos or drives can be connected to the operator panels. In this manual, t he term “thecontroller” refers to the connected equipment.

This manual explains how to install the operator panel. Please refer to the iX Developer reference manual for further information.

Order no: MAEN275

The information in this document is subject to changewithoutnoticeandisprovidedasavailableatthe

time of printing. Beijer Electronics AB, including all its group companies, reserves the right to change any

information without updating this publication. Beijer Electronics A B,includingallits group companies,

assumesnoresponsibilityforanyerrorsthatmayappear in this document. Read the entire installation

manual prior to installing and using this equipment. Only qualiﬁed personnel may install, operate or repair

this equipment. Beijer Electronics AB, including all its group companies, are not responsible for modiﬁed,

altered or renovatedequipment. Because the equipment has a wide range of applications, users must acquire

the appropriate knowledge to use the equipment properly in their speciﬁc applications. Persons responsible

for the application and the equipment must themselves ensure that each application is in compliance with

all relevant requirements,standardsandlegislationinrespecttoconﬁgurationandsafety. Onlypartsand

accessoriesmanufacturedaccording to speciﬁcations set by Beijer Electronics AB, including all its group

companies, may be used.

BEIJER ELECTRONICS AB, INCLUDING ALL ITS GROUP COMPANIES,SHALL NOT BE LIABLE TO ANYONE FOR ANY DIRECT, INDIRECT, SPECIAL, INCIDENTALOR CONSEQUENTIAL DAMAGES RESULTINGFROMTHE I NSTALLATION,USE OR REPAIROF THIS EQUIPMENT, WHETHER ARISING IN TORT, CONTRACT, OR OTHERWISE. BUYER'S SOLE REMEDY SHALL BE THE REPAIR, REPLACEMENT, OR REFUND OF PURCHASE PRICE, AND THE CHOICE OF THE APPLICABLE REMEDY SHALL BE AT THE SOLE DISCRETION OF BEIJER ELECTRONICS AB, INCLUDING ALL ITS GROUP COMPANIES.

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Foreword

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Contents

1 Safety Precautions ....................................................... 7

1.1 General ...........................................................

1.2 Hazardous Materials .... . ........................................

1.3 Disposal RequirementsUnder WEEE Regulations ...........

1.4 UL and cUL Installation .........................................

1.5 During Installation ..............................................

1.6 During Use .......................................................

1.7 Service and Maintenance ........................................

1.8 Dismantling and Scrapping .....................................

2 Installation ............................................................... 11

2.1 InstallationProcess ..............................................

2.1.1 Connectionsto the Controller ......... .........................

2.1.2 OtherConnectionsandPeripherals .............................

3 TechnicalData ........................................................... 15

4 ChemicalResistance .................................................... 17

4.1 Metal Casing .....................................................

5 OperatorPanel Drawings .............................................. 19

5.1 Connectors .......................................................

5.1.1 CommunicationPorts ...........................................

5.2 BoX2 pro Outline ................................................

6 Additional Installation Tips . . .......................................... 21

6.1 Grounding the operator panel ..................................

6.2 Ethernet Connection in the OperatorPanel ...................

6.3 To Achieve Better EMC Protection .............................

6.4 Ambient Temperature ...........................................

6.5 Safety .............................................................

6.6 Galvanic Isolation ................................................

6.7 Cable and Bus Termination RS-485 ............................

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Contents

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Safety Precautions

1SafetyPrecautions

Both the installer and the owner and/or operator of the operator panel must read and understand this installation manual.

1.1 General

• Read the safety precautions carefully.

• Check the delivery for transportationdamage. If damage is found, notify the

supplier as soon as possible.

• Do not use the operator panel i n an environment with high explosive hazards.

• The supplier is not responsible for modiﬁed, altered or reconstructed

equipment.

• Use only parts and accessories manufactured according to speciﬁcations of

the supplier.

• Read the installation and operating instructions carefully before installing,

using or repairing the operator panel.

• Neverallowﬂuids,metalﬁlingsorwiringdebristoenteranyopeningsinthe

operator panel. This may cause ﬁre or electrical shock.

• Only qualiﬁed personnel may operate the operator panel.

• Theﬁguresinthismanualserveanillustrativepurpose. Becauseofthemany

variables associated with any particular installation, the supplier cannot assume responsibility for actual use based on the ﬁgures.

• The supplier neither guarantees that the operator panel is suitable for your

particular application, nor assumes responsibility for your product design, installation or operation.

• It is recommended to turn on and shut down the operator panel at least once

before installing any components/cards or before connecting the operator panel to external devices; for example serial devices.

• ForMarine panels only:

– The operator panelmust be installed and operated as described in this

document to meet thiscertiﬁcation.

– Observe precautions for handling electrostatic discharge sensitive devices

1.2 HazardousMaterials

Toxic andhazardousmaterialsor elements

有毒和有害的材料或元素

Partdescription

零件描述

Pb Hg Cd Cr6+ PBB PBDE

PCBandelectronic components

PCB和电子元件

XOO O O O

O:Indicatesthattheconcentration ofthehazardoussubstanceinallhomogeneous materialsinthepartsisbelowtherelevantthresholdof theGB/T26572-2011 standard.

O：表示该有害物质在该部件所有均质材料中的含量均在 GB/T26572-2011规定的限量要求以下。

X:Indicatesthattheconcentrationofthehazardoussubstanceof atleastoneof allhomogeneousmaterialsinthepartsisabovetherelevantthresholdof theGB/T

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Safety Precautions

26572-2011standard. But stillcomplieswiththeEU RoHSDirective2011/65/EU.

X:表明该有害物质至少在部件的某一均质材料中的含量超出GB/T26572-2011规定的限量要求。但仍然符合EURoHS 指令2011/65/EU 。

1.3 DisposalRequirementsUnder WEEERegulations

Forprofessional users in the European Union: If you wish to discard electrical and electronic equipment (EEE), please contact your dealer or supplier for further information.

Fordisposal in countries outside of the European Union: If you wish to discard this product please contact your local authorities or dealer and ask for the correct method of disposal.

1.4 ULandcULInstallation

Caution:

Thissectionisonlyvalidfor ULlabeledX2panels.

• This equipment is suitable for use in Class 2 non-hazardous locations only.

[Combinations of equipment in your system are subject to investigation by the local authority havingjurisdiction at the time of installation].

• All devices have to be supplied by a Class 2 power supply.

Warning:

OnlyULandcUL approvedexpansionunitsareallowedtobeconnected to theportdesignated“EXPANSION”. Atthemoment therearenosuch units evaluatedorallowed.

SEULESLESUNITÉSD'E XTENSIONCERTIFIÉESULET cULPEUVENTÊTRE RACCORDÉESAUPORTDÉSIGNÉ«EXPANSION». ÀL'HEUREACTUELLE,AUCUNE UNITÉDECETYPE N'AÉTÉTESTÉE OUAUTORISÉE.

• This equipment is suitable for use in Class 2 non-hazardous locations only.

[combinations of equipment in your system are subject to investigation by the local authority having jurisdiction at the time of installation].

• All devices have to be supplied by a Class 2 power supply.

Warning:

OnlyULandc

ULapprovedexpansionunits areallowedtobeconnected to

theportde

signated“EXPANSION”. Atthemomentthereare nosuchunits

evaluate

dorallowed.

SEULESL

ESUNITÉSD'EXTENSIONCERTIFIÉESULET

cULPE

UVENTÊTRERACCORDÉESAUPORTDÉSIGNÉ«EXPANSION».

ÀL'HE

UREACTUELLE,AUCUNEUNITÉDE CETYPEN'AÉTÉ TESTÉE

OUAU

TORISÉE

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Safety Precautions

Warning:

Batterymayexplodeifmistreated. Do notrecharge,disassembleor dispose ofinﬁre.

LABATTERIEP E UT EXPLOSERENCAS DEMAUVAISEMANIPULATION. NELARECHARGEZPAS,NELADÉMONTEZ PAS ETNELA JETEZ PAS DANS LE FEU.

• This product contains a battery; this must only be changed in an area known

to be non-hazardous.

• Replace the battery with a BR 2032 battery. Useof another type of battery

may present a risk of ﬁre or explosion.

• Foruse on a ﬂat surface of a type 4X enclosure indoor use only.

• Use minimum 75°C copper conductors only.

• To make wiring connections to the power supply connector, follow the table

with cable and torque speciﬁcations below:

Terminal BlockConnector WireSizeAWG Torque (Lb.In.)

X1/X100Phoenixconnectors AWG30– 12 5–7 X1/X100Anytek connectors AWG24– 12 3.5 X1/X100DECA connectors AWG24–12 7

• ThesedevicesareClass2suppliedprogrammablecontrollers(industrialPCs)

for the use in industrial control equipment and are intended to be (front) panel mounted (Type 12 and 4x for indoor use only).

Caution:

TheenclosureprovidesadegreeofprotectionofatleastIP20,butwheninstalledinan apparatus,itshouldmeetIP65..

LEBOÎTIEROFFREUN DEGRÉDEPROTECTIOND'AUMOINSIP20,MAIS LORSQU'ILESTINSTALLÉDANSUNAPPAREIL,ILDOITÊTRE DECLASSEIP65.

1.5 DuringInstallation

• The operator pane

l is designed for stationary installation on a planar surface,

where the followi

ng conditions are fulﬁlled:

– no high explosiv

erisks

– no strong magne

tic ﬁelds

– no direct sunl

ight

– no large, su

dden temperature changes

• Install the operator panel according to the accompanying installation

instructions.

• Ground the operator panel according to the accompanying installation

instructions.

• Only qualiﬁed personnel may install the operator panel.

• Separate the high voltage, signal, and supply cables.

• Make sure that the voltage and polarity of the power source is correct before

connecting the operator panel to the power outlet.

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Safety Precautions

• Peripheralequipment must be appropriate for the application and location.

1.6 DuringUse

• Keep the operator panel clean.

• Emergency stop and other safety functions may not be controlled from the

operator panel.

1.7 ServiceandMaintenance

• Only qualiﬁed personnel should carry out repairs.

• The agreed warranty applies.

• Before carrying out any cleaning or maintenance operations, disconnect the

equipment from the electrical supply.

• Replacing the battery incorrectly may result in explosion. Only use batteries

recommended by the supplier. During the warranty period, the battery needs to be replaced by an authorized Beijer Electronics service center.

1.8 DismantlingandScrapping

• The operator panel or parts thereof shall be recycled acco

rding to local

regulations.

• The following components contain substances th

at might be hazardous to

health and the environment: lithium batteryan

d electrolytic capacitor.

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Installation

2Installation

2.1 InstallationProcess

5.5

11.7

5.5

11.7

127.6 M4 x 0.7

1 (6x)

5.5

TheBoX2procanbeusedasabenc

h top device or clipped onto a DIN rail. For

custom mounting, the DIN rail m

ount can be moved from the standard position,

opposite the connection, to a

side. The mount can be removed for access to all the

mounting points shown ab

ove.

The following is needed:

• No tools required - stand

ard usage

• A Phillips screwdriver

for movement or removal of the DIN rail mounting

bracket

Unpackand check the delivery. If damage is found,notify the supplier.

Note:

Placetheoperatorpanelo n astablesurfaceduring installation. Droppingtheoperatorpanelorlettingitfallmay causedamage.

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Installation

Connect the cables in thespeciﬁed order, according to the drawing and steps below.

Caution:

• Theoperatorpanelmustbebroughtto ambienttemperaturebeforeitisstarted

up. Ifcondensationforms,ensurethat theoperatorpanelisd ry beforeconnecting ittothepoweroutlet.

• Ensurethattheoperatorpaneland thecontrollersystemhavethe sameelectrical

grounding(referencevoltagelevel),otherwiseerrors incommunicationmay occur.

• Ensurethatthe voltageandpolarityofthepowersourceiscorrect.

• Separatehighvoltagecablesfromsignalandsupplycables.

• Shieldedcommunicationcablesarerecommended.

24V DC

RS232/ RS422/ RS485

24V DC

Controller

Power

Ethernet

The image is ill ustrative only and may differ slightly from the actual panel.

– Connect cable A. – Connect cable B, using 14-20 AWG (2.08–0.52 mm

), 180–220 N-cm

torque.

– Connect cable C. – Connect cable D. The recommended cross-section of the cable is 1.5

2.1.1 ConnectionstotheController

Forinformation about the cablesto be used when connecting the operator panel to the controller, please refer to the help ﬁle for the driver in question.

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Installation

2.1.2 OtherConnectionsandPeripherals

Cables, peripheralequipment and accessories must be suitable for the application and its environment. For further details or recommendations, please refer to the supplier.

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Installation

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Technical Data

3TechnicalData

Parameter BoX2 pro

Dimensions,W×H×D 128×101×39mm Sealing IP20 Framematerial Powder-coatedaluminum Weight 0.4 kg CPU i.MX6DualLite

DualARMCortex-A9Core

1.0GHz 512kBL2cache

Serialports StandardD-sub(9Pin,female)

COM1: RS-232withRTS/CTS COM2: RS-422/RS-485 COM3: RS-485

EthernetLANA 10/100MbitBase-T(shieldedRJ45withLEDs) EthernetLANB 10/100MbitBase-T(shieldedRJ45withLEDs) USB 1×USBHost 2.0,maxoutputcurrent500 mA

SupportsuptoUSB 2.0HighSpeed

Externalstorage media

1×SDcard

Flashmemory (application memory)

1.5GBSSD(eMMC)

MemoryRAM 1GBDDR3 NVRAM 128kB Real timeclock Yes Battery BR2032lithiumbattery,

replaceable

Powerconsumption atratedvoltage

Fuse InternalDCfuse,3.14AT,5×20mm Powersupply +24VDC(18–32VDC)

CE:Thepowersupplymustconformw ith therequirements accordingtoEN/IEC60950andEN/IEC61558-2-4. ULandcUL:Thepowersupplymustconformwiththe requirementsforclass2power supplies.

Operating temperature

-10°Cto+60°C

Storagetemperature -20°Cto+70°C Relativehumidityin

operation

5%–85%non-condensation

Vibration 1g,accordingtoEN/IEC 60068-2-6,Test Fc Mechanicalshock 15g,half-sine,11msaccordingtoEN/IEC60068-2-27 Approvalsand

certiﬁcations

CE/FCC/KC Informationisavailableon www.beijerelectronics.com

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Technical Data

Parameter BoX2 pro

ULapproval Yes, informationavailableatUL.com Marinecertiﬁcates Informationisavailableonwww.beijerelectronics.com

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Chemical Resistance

4 ChemicalResistance

4.1 MetalCasing

The frame and c asing material is powder-coated aluminum. This powder paint withstands exposure to the following chemicalswithout visible change:

Aceticacid10% Phosphoricacid4% Citricacid10% Phosphoricacid10% Diesel Seawater Distilledwater Sodiumchloride2% Edibleoil Sodiumchloride20% Fueloil Sulphuricacid20% Hydrogenperoxide3% Tapwater

The powder paint shows limited resistance to the f

ollowing chemicals at room

temperature:

Butanol Nitricacid3% Hydrochloricacid5% Nitricacid10% Isopropylalcohol Phosphoricacid43% Sodiumhypochlorite10% Turpentine

Note:

Ifexposure toanyof theabovechemicalsisdemanded, itisrecommendedtoﬁrsttest thechemicalinahidden spotofthemetalcasing.

Thepowderpaintshowslittleornoresistancetothefollowingchemicalsatroom temperature:

Aceticacid,conc. Methyl-ethylketone Toluene Acetone Nitricacid30% Trichlorethylene Ammonia5% Phenol Xylene Ammonia,conc. Sodiumhydroxide5% 97octaneunleadedpetrol Ethylacetate Sodiumhydroxide30% 98octaneleadedpetrol

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Chemical Resistance

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Operator PanelDrawings

5 OperatorPanelDrawings

5.1 Connectors

Pos. Connector Description

1 Powersupply +24VDC(18–32V DC) 2 LANA 1×10/100Base-T(shieldedRJ45) 3 LANB 1×10/100Base-T (shieldedRJ45) 4 COM Serialcommunication port

5.1.1 CommunicationPorts

Serialport,9-pin female

COM1 COM2 COM 3

RS-422Tx+

RS-485Tx+/Rx+

2RS-232RxD - 3RS-232TxD - 4 - RS-422Rx+ RS-485T x+/Rx+ 5GND GND -

RS-422Tx-

RS-485Tx-/Rx-

7RS-232RTS - 8RS-232CTS - 9 - RS-422Rx- RS-485Tx-/Rx-

Note:

Inordertoutilizetwocommunication ports,theY-split cableCAB109mustbeused. InordertoutilizethreecommunicationportsthesplitcableCAB150 mustbeused. TouseRS-232andRS-422,useCAB 109. TouseRS-232andRS-485,useCAB 150.

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Operator PanelDrawings

5.2 BoX2proOutline

128

Note:

AStepCADﬁle isavailableonthewebsitewww.beijerelectronics.com

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Additional Installation Tips

6 AdditionalInstallationTips

When experiencingcommunication problemsin noisy environments or when operating close to temperature limits, the following recommendations are to be noticed.

6.1 Groundingtheoperatorpanel

5350

Door

Operator panel

Ferrite core

Mounting plate in the cabinet

Power supply

24 V DC

The mounting clamps of the operator panel do not provide a secure grounding connection between the panel and the device cabinet, see 1 in drawing above.

Connect a wire, that is sized correctly according to local electrical codes, between the quick-connect terminal connector on the operator panel and the chassis of the panel, see 2 in drawing above.

Connect a wire or grounding braid, that is sized correctly according to local electrical codes, between the chassis of the operator panel and the closest grounding point on the door, see 3 in drawing above.

Connect a strong but short grounding braidbetween the door and the device cabinet,see 4 in drawing above.

Twist the cables onto the24

V DC feed, see 5 in drawing above. 2 turns around the ferrite core provide 4 times the suppression of 1 turn. 3 turns around the ferrite

core provide 9 times the suppression of 1 turn.

Connect a wire or grounding braid, that is sized correctly according to local electrical codes, between the chassis of the operator panel and the closest grounding point.

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Additional Installation Tips

Note:

Thegroundingwiresshouldbeshortandtheconductor shouldhavealargearea. Along,thingroundingwire hasaveryhigh impedance(resistance)athighfrequencies anddoesnot guidedisturbancestotheground. Multi-wireconductorsarebetterthan singlewireconductorswiththesamearea. Abraidedconductorwire withthesameareais evenbetter. Thebest isashort,thick groundingbraid.

6.2 EthernetConnectioninthe OperatorPanel

RJ45

Industrial Ethernet

Operator panel

Shielded

Short and unshielded

0.1 μF 250 V

1-1 3-3

8-8

2-2

In some industrial unitsfor Ethernet, the RJ45 contact’sshield is connected to the chassis via a capacitor, see 1 in drawing above.

The operator panel’sEthernet shield is directly connected to the chassis, see 2 in drawing above.

Check whether the other Ethernet unit has its shield directly grounded or grounded via a capacitor.

Note:

Inmanycases,connectingtheshieldedEthernetcablingtothechassisat bothendsis inappropriate. Humorgroundingloops canoccur. Unshieldedcablingmayevenresult infewercommunicationerrors.

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Additional Installation Tips

A good solution may be to use a shielded Ethernet cable, but to connect the shield at one end only.

One option is tobreak the shield, see 3 in drawing above. A more elegant methodis to expand the shielded Ethernet cabling with a pieceof

unshielded Ethernet cable, see 4 in drawing above. The shield can be grounded via an external 0.1 μF/250 V ﬁlm capacitor,see 5 in

drawing above. This connects the HF transients to ground.

6.3 ToAchieveBetterEMCProtection

• Initially, use the original cabling from Beijer Electronics primarily.

• Useshielded cables for RS-232 communication.

• Usetwisted pair and shielded cabling for RS-422 and RS-485.

• Usethe cabling intended for the bus type; Ethernet, Proﬁbus, CC-Link,

CAN, Device Net etc.

• Install and connect according to applicable speciﬁcations for the relevant bus

standard.

• Useshielded cabling for Ethernet,preferably with foil and a braided shield.

• D-sub covers should be shielded, and the shield should be connected to the

cover 360° where the cable enters.

• Connect the shield at bothends.

Shielded cable

Not same potential

Ground plane 1 Ground plane 2

Ground plate Ground plate in another building

0.1 μF/250 V

With longer distances, there is a risk that the ground potential may be different. In that case, the shield should only be connectedat one end. A good alternative is to connect the other end of the shield to the ground via a 0.1 μF/250 V ﬁlm capacitor. Both ends are then connected to the ground in terms of HF, but only connected to the ground at one end in terms of LF, thus avoiding the 50/60 Hz grounding loops.

Metal cabinet Metal cabinet

Terminal or connector Terminal or connector

EMC cable gland

Plastic cable gland

Shielded cable

Short distance

Cable clamp in steel

Shielded cable

Usean EMCcable gland or regular plastic cable gland, remove the outer jacket andconnecttheshieldtotheinstallation plate with a 360° metal cable clamp.

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Additional Installation Tips

Place the 24 V DC and communicationscabling in one cable trunk/cable duct and 230/380 V AC in another. If the cables need to be crossed, cross them at 90° only. Avoid combining the cabling for stronger 24 V DC outputs with the communication cabling.

Ferritecores that are snapped onto the shielded cabling may remove minor disturbances. Large ferrite pieces that are snapped onto unshielded cabling and where the wires go 2-4 times around the cores are approximately 5-25 times more efﬁcient.

6.4 AmbientTemperature

The maximum ambient temperature for the operator panel is provided in the speciﬁcations. The ambient temperature refers to the temperature in the device cabinet which cools the operator panel’selectronics.

Operator panel

Powe r

30 °C outside

To p 50 °C inside

Bottom 40 °C inside

Middle 45 °C inside

Airflow

Axial fan 120 x 120 mm

Inmostcases,theambienttemperaturefortheoperatorpanelissigniﬁcantly higher than the device cabinet’s ambient temperature.

If the cabinet is tall and there a re a

number of heat-generating devices, the

temperature at the top of the cabin

et is considerably higher than the temperature

increase that would be expect

ed. All electronics are sensitive to heat. The lifespan

of an electrolytic capacito

r is cut in half with an 8-10 °C increase in temperature. A

15-20 °C temperature incre

ase results in a quarter of the lifespan etc.

Rittal has a go od program for estimating the anticipated average temperature in the cabinet as well as a large program for controlling the temperature in the device cabinet.

An enamel-coated stee

l cabinet has a radiant heat value of 5.5 W/m

per degrees C.

Installing a fan inside the cabinet evens out the temperature, while moving air provides considerably better cooling than still air.

Install the fan so tha

t it sits in a cooler area and b lows cold air against the operator

panel. If the fan is m

ounted at the topand sucks warm air upwards, the ambient

temperature of the

fan becomes higher, resulting in a shorter lifespan.

An approximate value of the net power consumption for the operator panel can be calculated by multiplyingthe supply voltage with the current drawn by the operator panel. This is assuming that all supplied power is transformed to heat.

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Additional Installation Tips

6.5 Safety

Power supply 230 V AC to 24 V DC

Operator panel

Distance?

Small controller with expansion unit

+24 V

0 V

230 V AC

COM1

COM100

Ch0

Ch1

Ch100

Ch101

5355

If a power supply that meets safety standardsis used and only powers the operator panel, there is no problem. See 1 in drawing above.

However, if a 24 V unitthat also powers other

unitsisused,thereisreasontobe

cautious, see 2 indrawing above. The opera

tor panel does not have insulation

that meets safety requirements in the eve

nt of a potential short circuit between

230 V AC and 24 V DC. It is assumed that the 2

4 V power supply is secure, for

example, SELVaccording to EN 6095

0 (protection against electric shock) and

UL 950.

Note:

Hereisanexample thatexplainswhyasecure 24VDCpowers upply canberuinedby mixing24V relaycontacts with230V ACrelaycontacts inasmallercontroller. Check thattheclearancesandcreepage distancesbetween24VDC and230VACfulﬁll EN60950orUL950. Ifnot, inputaseparate24Vunit intotheoperatorpanel.

If there is a substantial distance between the relay contactsfor 24 V DC and 230VAC,itisOKtousethesame24Vdevicesforallfeeds. See3indrawing above.

Connect 0 V on the 24 V power supply to the ground, see 4 in drawing above. This offers three advantages:

• Safety is increased. The 24 V power supply is not live in the event of a faulty

connection or short circuit between 0 V (24 V) and 230 V phase.

• Transients on the 24 V feed are connectedto theground.

• No risk that the 24 V feed is at a high level in relationship to the ground. This

is not unusual since there is high static electricity.

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Additional Installation Tips

6.6 GalvanicIsolation

USB

RS232RS422/485

+24 V DC

0 V

Filter

DC/DC galvanic isolation

VCC

0 V (GND)

DC/AC

CFL

Ethernet

Internal electronics

1.5 m

The operator panel has galvanic isolation against the 24 V DC power supply but no galvanic isolation between the communication ports for RS-232, RS-422/RS-485 and USB. Only the Ethernet connection has galvanic isolation.

* *

***

Operator panel Modular controller Printe

PCPC

Different ground potential

= Internal 0 V (GND) connection

Power CPU COM COM2

RS422 RS232 USB

When a PC is connected to the operator panel, the internal 0 V (GND) of the panel is connected to the protective ground via the PC.

A number of USB devices can have the shield connected together with the protective ground. Here,the 0 V (GND) of the operator panel is connected to the protective ground when, for example, a USB memory stick, keyboard, or similar device is plugged in.

If a number ofunits are connected that have a 0 V and a ground connection, and these are connected to various grounding points, there is a substantial risk of problems. Grounding currents go through communication cables, the rear plate of the controller,internally in the operator panel, and can cause errors.

Use external units to improve communication and achieve galvanic isolation. Westermo has good industry-standard insulators that are also insulated from the 24 V DC feed.

Note:

Itisveryimportanttomakesurethatt he 24Vfeedintheexternalinsulationunitis not connectedtooneo f thecommunicationoutlets. Ifitdoesnothave100%insulation againstthe24Vf eed, disturbancesandgroundingcurrentsfromthe 0Vonthe24 V sidedisruptthecommunication. Usingthistypeofunit solvesoneproblembut createsalargerp roblem! Asubstandard installationmayworknow,butproblemsmayarisewhenother devicesareconnected.

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Additional Installation Tips

6.7 CableandBusTerminationRS-485

• If maximum transfer distance and maximum transfer speed is needed,

shielded and twisted pair cable should be used. The mutual capacitance may not exceed 52.5 pF/m, and the cable area should be at least 0.25 mm

(AWG 24).

• 0 V, the reference voltage for communication should be included in

the cabling. With two-way communication use two pairs; one pair for communication and one pair for 0 V.

• The shield must be g roundedat one end. The other end is usually grounded,

but with longer distancesor when there is a difference in the ground potential, theshieldshouldbeconnectedtothegroundvia0.1μF/250Vﬁlmcapacitor to prevent ground current in the braided shield. A number of manufacturers recommendthattheshieldbegroundedateachnode. Variousmanufacturers have different systems for bus termination.

Depending on the recipients’ design, the bus wires may be on the same level or require pull-up or pull-down to ensure that no faulty signals are detected when the bus is in resting mode (all transmitters are disconnected).

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