presentation: electronic housings for industrial applications

8/6/2019 Presentation: Electronic Housings for Industrial Applications

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Electronic Housings

Considerations, Standards and Practicesfor Industrial Applications

By Mike Nager

Phoenix Contact,

Inc.

The following was presented at

the IPC APEX EXPO Conference

and Exhibition in Las Vegas, April

13, 2011. The notes provided in

this scroll have been added for

on-line use. A technical paper is

also available providing more

detailed technical information. Allrights reserved.


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What is Industrial?

Its good to

define our termsup front, sotheres no

confusion. Justwhat do I meanby industrial?


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This

Instead of long

windedexplanations,lets just give

some examples.This is anexample of

industrial. Itsan outdoorharbormonitoring app.


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Flickr/ rack in pro tools suite / Chris Campbell

Not That!

But audio / video

equipment is notwhat I considerindustrial. Suchequipment ismounted inracks, indoors

and not subjectto harshenvironments.


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Flickr/Pelco Surveillance Cameras/takomabibelot

This

Security

applications,especially whenoutside, aregood examplesof industrial.

Note the all the

steel cabinetsundoubtedlyPCBs are inside.


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Flickr/ the pinky rack / pallotron

Not That!

But the IT racks

that many of arefamiliar with donot fit theindustrialdefinition for thisdiscussion.


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This

Electronics usedin any type ofpowergeneration willalmost always fitour idea ofindustrial. Here

is a panel usedat a solar plant.


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Flickr/ altoids crystal radio /BitHead

Not That!

But devicesused forpersonal or evencommercial usewill not requireindustrial

housings

almost any willdo for theseapplications.


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Flickr / Not a sign of sunshine / cablefreak

This

Applications formonitoring,controlling, orautomating thecollection of dataare oftenindustrial.


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Flickr/Jardin Electrique/meddygarnet

Not That!

While others arenot, but theyshould be.Actually Im not

sure exactlywhat to sayabout this

housing choiceother than dont

touch it!


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How to Protect a

Sensitive Product?

Flickr / JTAG board 1 / AMagill

The primarypurpose of anyelectronichousing is toprotect yourPCB design

and perhaps

even increasethe functionalityof the circuit.


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Control Cabinets

Remember thephotos - the endproduct will beplaced into acontrol cabinet,often made ofsteel, to keep out

the harshenvironments. Aback mountingplate is used.


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Panel Mount

Flickr / backs of small drives /

Panel mountingis a way ofputting electronicdevices in thecabinet but its

not very flexible.Individual and

unique mountingholes areneeded for everydevice.


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DIN Rail Dimensions

DIN rail follows astandarddeveloped inEurope soproducts fromdifferentmanufacturers

are guaranteedto work witheach other.


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DIN Rail Variations

It comes in acouple differentsizes and is soldin two meterlengths whichare cut to fit ontothe mounting

plate, eithervertically orhorizontally.


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Easy On / Easy Off

A really nicefeature is thathousing simplyclick onto the railwith no tools,and are alsoeasily removed

with just ascrewdriver!


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Vertical and Horizontal PCBs

PCB boards arealso defined bytheir orientationto the DIN rail.On the left, isone horizontalPCB and on the

right, two typesof vertical PCBsalignments areshown.


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Grounding

Flickr / Keeping my feet on the ground / purplemattfish

No, not this typeof ground. I wantto discusselectricalgroundingconsiderations!


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Grounding

Electronichousings cantake advantageof the fact thatDIN rails arealmost alwayselectrically

grounded so aspecial foot can

bring it into thePCB circuit!


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IP Ratings

IP rating andtouch safe isvery importantfor the housingand connectors.Test apparatus isused to

determine ifproducts meetthe safetyrequirements.


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Busing Options

Flickr / East London Bus Group / AndrewHA

No, not this typeof bus. I meantto discusselectricalbusingconsiderations!


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Busing Options

It is possible touse the housingto bus commonpower and signalconnectionswithout daisy-chaining wires

between thedevices. Severaltypes are shownhere.


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PCB Trays

The simplestway of getting aPCB circuit ontoa DIN rail is touse a tray thatholds the circuitto the rail. Quick

and easy - notmuch protectionfor the PCBthough.


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Tray Accessories Protective Covers

Labels

But even for traysystems, thereare some niceaccessories likecovers andlabels that canreally polish up

the appearanceand make it looknice.


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More Functional Housing

Fully Enclosed

IP20

Vented

User Configurable PCB

Removable or Fixed

Connectors

Grounding via DIN rail

Narrow design

Housings withmany morefeatures areavailablehowever. Sincecustomersinteract with your

circuit via thehousing,consider all yourchoices carefully.


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Building Automation

DIN 43880

For built-in

electronicsStandardized

dimensions

For buildingautomationapplications,especially inEurope, aspecific standardhas been

devised so alldevices will worktogether.


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Special Application Colors

Colors can beused to signifyspecificindustrialapplicationssuch as safetycircuits or

intrinsically safecircuits. Or justprovide visualappeal!


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Power DissipationTable 2: Maximum Heat Dissipation:

How Vents and Spacing Change the Maximum AllowedHeating [i]

@ 20C Ambient Temperature

Vents Present?

Yes No

No spacing between housings 4.4 W 4.3 W

20 mm between housings 8.4 W 7.1 W

[i] Data from Phoenix Contact ME 12,5 series of electronic housings

Housingmanufacturerswill give youguidelines onhow much heata housing candissipate under

certainconditions.


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Temperature Derating

0

0.2

0.4

0.6

0.8

1

20 30 40 50 60 70 80

Heat dissipationcapability can besharply reducedif the expectedambienttemperature isgreatly elevated

though!


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Thermography

Before After

After circuitprototyping, itsuseful tothermally imagethe design in thehousingto makesure there are no

hot spots andoptimize thedesign!


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Test and Standards to prevent

UL94 IEC Glow Wire Test

Reputablehousing vendorsshould be ableto tell you whatflammabilitystandards thehousings are

designed to.


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Flickr/ inside the control box / Tom Gill (lapstrake)

This.

Because the lastthing you want isfor the circuit tocause a fire oremit harmfulfumes if it ignitesfor any reason.


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Customization

Milling Injection Molding

Sometimes youmay need holesor slots in thehousing for lightindication oraccess topotentiometers.

Different choicesare available.


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ConnectorsPluggable

or Fixed

Technologies

Connectors areextremelyimportant sinceyour customerinterfaces withthem directlytechnologies are

available toprovide theoptimal userexperience.


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Questions?

Flickr/Kookaburra-in-the-junction box/Trois Ttes (TT)

Thanks forhanging through

to the end! Formuch moredetailedinformation viewor download the

actual technicalwhitepaper!


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Thank you

Mike Nager

[email protected]

[email protected]

I can be contacted at Mike Nager on LinkedIn, Twitter
mailto:[email protected]:[email protected]:[email protected]:[email protected]

presentation: electronic housings for industrial applications

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