Tm 5-7045 SEARCHLIGHT, 60-INCH MODEL 1942 AND CONTROL STATION

7/28/2019 Tm 5-7045 SEARCHLIGHT, 60-INCH MODEL 1942 AND CONTROL STATION

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S

el1942

s:

uctionsManual

Lists

anual

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icDomain,Google-digitized

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ructionManual,

ODEL1942,and

hedbytheGENERAL

ishedforthe information

ned.

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ROLSTATION

EARCHLIGHT

6879INCLUSIVE

S.ARMY


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sbeenpreparedtoaid intheopera-

neralElectric60-inchAntiaircraft

constructionandcoverstheopera-

controlstation only.Maintenance

recoveredbyaseparateMaintenance

perationandmaintenanceofthe

ecoveredrespectivelybyaPowerPlant

7049)andaPowerPlantMainte-

).

havebeen numberedconsecutively

re suitablytitled.Alistof these

numberonwhichtheyappear,will be

ghtto theantiaircraftproblem,as

plesunderlyingthedesignofthe

cussedinanaddendumtothis Manual.

thereferencenumbersofpartsand

hereferencenumbersofthesameparts

chlightandControlStationParts and

epurposeofthis istofacilitatethe

njunctionwitheachother.

ecommendedthatitbestudiedin

ge1.Skippingaround,especiallyinthe

edandtechnicaldescription,willlead

eitmore difficulttounderstandthe

t.


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3

..................................IX

.......XI

nsions............................XI

.................................149

STRUCTIONS

..............1

..............................3

4

....6

............7

.............10

...............................12

........13

mechanismAssembly..............16

oller.............................17

Frame...........................17

...........18

er-baseAssembly...............18

embly.............................20

..........20

ESANDMISCELLANEOUS

Cables..........................22

ent..............................22

ox..............................22

wageBox..........................23

............................23

s..................................23


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nt'd)

towing24

PMENTSETUP

on26

tup27

29

ntPoint.30

ctionofUnits32

ndCarboning33

ons35

l35

odsofD.E.C39

rol39

ol40

ontrol42

3


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nt'd)

NDTECHNICAL

ge

stem46

fLampOperation48

on48

8

49

tion49

rent54

ruments56

6

s58

58

ce58

eaderSystem58

m59

m60

rolTransformers60


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nt'd)

s62

apterRelay62

PilotLight63

use63

Switch63

TROLSYSTEM

D.E.C63

atibn64

chlightandControlStation65

odsofD.E.C65

matSearchlight66

matControlStation72

m73

rator74

oftheAmplidyne....74

ftheAmplidyne75

eGenerator76

ghtOperation76

77

ubsystem77

78

er78

s81

81

cuit82

cuit83


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nt'd)

Low-speedSystemsCombined...84

thLow-speedSystemAlone..84

5

ManualD.E.C86

86

6

86

tor87

88

ctor88

tSwitch88

witches89

s89

BRICATION,

ON

91

7

sformers108

ControlTransformer109

ControlTransformer114

mits117

118

t119

sion120

22

23

thClutch.123

th-flywheelClutch124


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nt'd)

n125

eZero-indicationSystem128

icationSystem128

peration128

edIndicators129

cator129

dicator130

eedIndicators130

icator131

dicator131

E.C.Operation131

ystem132

LEM

39

ectorDiameter140

the Source142

ciency143

143

osphere144

cteristicsoftheTarget145

er147

fGlasses148


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EquipmentXII

gPosition1

tationPosition2

2

4

anismBox16

bly17

3

earchlightEquipment27

t36

tion37

GeneralArcSystem45

LampGearing51,52

7

Zero-readerSystem59

TransmitterandControlTransformerat

TransmitterandControlTransformerin

on61

AzimuthD.E.C.System64

SearchlightGearing67,68

Control-stationGearing69,70

Power-driveSubsystem74

eratorTheory75

Electrical-actuationSubsystem78

ElectronicAmplifier79

nbetween1-speedand33-speedSystems84

ProtectiveSubsystem87

mp-mechanismBox92

mpandMirror94


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ont'd)

earchlightAssembly94

hassis96

ase96

rntable96

zimuthCorrector98

nctionBox98

zimuthControlBox98

evationControlBox100



ontrolStation102

ontroller102

evationInstrumentHousing106

ontrollerInstruments107

urntableLevels108


evationHigh-speedControlTransformer.111

PointsinjunctionBox112

o-indexPointer113

ontrolTransformerAdjustingWorm..113

vationHigh-speedControlTransformer114

ontrolTransformer.115

vationLow-speedControlTransformer.116

vationLow-speedControlTransformer.117

amp-mechanismBox118

earchlightLamp119

esinPosition 120

hermostatMirror121

round-glassFinder122

ontroller123

rSearchlightandControlStation135

ramforSearchlightandControlStation137

Arc140

Arc140

genceT141

eIntensityofBeam142

fAngleofAspect146

sibilityof theTarget147

sitionwithRespecttoArcon Visibility


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ileddescriptionofthe operation

chlightequipment,itisimportant

with therelationshipofthisequipment

aftbattery.

chabattery istodefendaposition

heantiaircraftgunsarethe nucleusof

roperlydirectthegunfireona swiftly

roldirectorisemployed.Inthepresent

viewthe targetinorderto obtainthe

tationoffuturetargetposition.At

ansofilluminatingthetargetmustbe

tionofthe searchlightequipment.

pointinspacetowhichthe search-

d,thepositionofthetarget isdeter-

gulardisplacementofthesearchlight

fromthelocator.However,fortactical

rable,especiallyafterthetarget

olthesearchlightbeamfromacontrol

entrequirements,thelocatorandcon-

at pointsdistantfromthesearchlight,

ollingthesearchlightfromthesere-

Thisisthe functionofthedistant-

stem.Thenecessarypowerforproper

unitsis suppliedbythepowerplant

or.Adescriptionofeachunit ofthe

lbefoundinSectionI. Ageneralar-

entisshownin Fig.1.Actualemplace-

edindetailin SectionI.

NDDIMENSIONS

Binoculars


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ghtequipment


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TRUCTIONS

ations,associatedreferencesandtext,provides

esearchlightequipmentsufficientonlyforoper-

rchlightequipmentconsistsofalltheitemsshown

however,willnotbediscussedinthis book,

sand MaintenanceManualprovidedseparately

riousparts willbemadeinmore detailinsub-

visionsofthesearchlightareshownin Fig.2,

hlightarrangedbothforoperationandfor trans-

onsaredesignatedbyletterreferences,inorder

edandreferredtothroughoutthis instruction

fied.

atingposition


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HTANDCONTROLSTATION

portationposition

smBox


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UIPMENT

howninFig.3. Theillustrationinitselfpre-

ofmanyof thedetails,andsuchitemsrequireno

ection.Foroperation,andfor otherdetailswhich

escriptivecommentshavebeenprovidedwith

usin-

e

ergize

their

rting-

mbly

and

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19/162

OX

s

h

able

able

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ble

y)

gative

he

orfor

erre-

ator

nput

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HTANDCONTROLSTATION

sociatedreferencesdescribe,themajorcom-

bly.

Trans-

volt-

e

sition

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th

ator

hen

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on

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ONTROLBOX

thitsmechanicalandelectricalelementsare

x

dicator

muth

rom

ers

or

-gen-

cuit

uth

ve

33-

em

r

th3 3-

or

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HTANDCONTROLSTATION

x(Cont'd)

h

ampli-

dazi-

dicator

33-

em

tor\

h

embly

caland

constitutingtheturntableassembly.

ook

bly

nter

min

hlight

n

while

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E

e

mbly

or

run-

sing

or-

tor

ontrol

gs

and

e

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TANDCONTROLSTATION

ndits principalmechanicalandelectrical

Fig.8.

x


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CONTROLBOX

ch

Arms

Sock-

ol

ts

Selec-

ws

cir-

mp

ment

ampli-

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HTANDCONTROLSTATION

mplifierandfuseboardareillustratedin

r

er

evation

on-

tion

tor

speed

3-

r

ampli-

nts

al

nal

ower

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TROLSTATION

rfocal

on

r

hlight

ment

ntoa

on

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STATION

mer

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eader

sta-

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RMOUNT


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HTANDCONTROLSTATION

ESANDMISCELLANEOUSEQUIP-

embliesforusewiththis searchlightequipment

torcableorafifteen-conductorcable,furnished

t,isrequiredforconnectionbetweenthelocator

fteen-conductorcableiskeyeddifferentlyfrom

leusedbetweenthesearchlightandthecontrol

eofthesecablesis impossible.Theplugsareso

onin,or withdrawalfrom,theirpropersockets

he plugbodies.Anattempttowithdrawaplug by

sult inbrokenconductors.Allplugsmustbe

ymeansoftheirassociatedwingnuts. Maleplugs

with protectivecapswhichmustbefirmlyattached

tsassoonasthe cableisdisconnected.Thiswill

heskirtbeing forcedoutofround.Atough,flexible

both powerandcontrolcables;care,however,

ventdamagetothe sheathandtoavoidsharpbends

ent

veboxes,cablereelsandreplacementcarbons

hlightequipment.Ageneraldescriptionofeach

providedbythe directlyfollowingparagraphs.

ationsparepartsandtools,togetherwiththe

nsportingcase,formaseparatesingleitem ofthe

.1.Parts andtoolsarelistedupon theinnerside

forreference,arealsolisted intheMaintenance

chitemis eitherapparentorwillbedescribedin

anceManual.


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INGANDSTOWING

sthecorrespondingclampassemblyontheturn-

the"A"framecannotbesecuredto theturntable

"A"framesarehigherthantheircorresponding

urntablearms,turneitherthe right-rearjackscrew

nacounterclockwisedirectiontolowerthe

eft-rearjackscrewortheright-frontjackscrew

ssisuntilthesocketsengagetheir respectiveclamp

arelowerthanthe clampassemblies,turnoneof

sitedirectiontothatgiven aboveuntilthesockets

ampassemblies.Afterboth"A"frameshavebeen

aiseall ofthejackscrewsandsecurethemwith

positionfor loading,andattachtheload-

bolt.Thetowingbarshouldbeusedto assistin

ringtheloadingprocedure.

dsecureit inplaceonthetransporting

ntofthevehicleturnbucklestothechassishold-

rnbucklesbymeansoftheirlockingnuts.Remove

hassiseyebolt.

wingbar onthesearchlightchassisrack.

tendedhandcontrollerin theproper

nsportingvehicle.

nvascoverandstowit atasuitableloca-

hicle.

sandopensightfromthe binocular

nS498fromthebinocularmount.Collapsethe

sition,andlockit inplacebythelinkagepin.

ntuntiltheyokeis overheight-adjustmentcrank

meansof thecrankifnecessary.Nowlowerthe

okestraddlesthecrankhousing.Releasebinoc-

hecontroller,andremovethebinocularmount

.PlaceandclampsocketcoverS63inthe socket

ebinoculars,opensight,andbinocularmount

xshowninFig.15.Lockand stowthisboxin

nsportingvehicle.

edthumbscrewsontheundersideof the

resoarrangedthat releaseofthecontrollercan

sremainingattachedtothe tripodproper.The

dbythehandlesS32. Stowthecontrollerinits

rtingvehicle.

braces,collapsethelegs,andstowthe

eon thetransportingvehicle.Properstowage

mentofthetripodjackscrews.


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CHLIGHT

ntof

towingspringfromthel ugontherear

toitsstoragehookT90on theturntablearm.

esbylooseningtheclampson theturn-

htis standingonslopingorunevenground,

ovethe jackscrewlockingchainsandpartially

owingaproceduresimilartothat outlinedin

the'"A"-framesocketscanbedisengagedfrom

"framesdownwardtoanapproximatelyhori-

agetheframesfromthe jointsupportsonthe

groundunder thechassis.

rake,lowerthedrumto itsapproximate

ndresetthebrake.

upport,suchassolidground,or rockor

stsatthejack-feetlocations.Turnthesearchlight

pointedoverthejunction-boxendof thechassis.

yremovingtheirchains.Levelthechassisbyscrew-

screws.Thejackscrewsmustbeloweredtosuch

e searchlightwillberemovedfromeachofthe

esearchlightwiththedrum inthepreceding

ostaccuratelevelingforall azimuthpositions,

hatthelevelbubbleswillnot remaincentralat

nylevelingprocedure.


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HTANDCONTROLSTATION

theirretainingholesonthetripod, and

setfirmly,andapproximatelylevel,inplace.

ositionon thetripod.Exercisecarein

thereceptacleandthecenteringflangepassthrough

Rotatethecontrolleruntilthe shouldersonthe

softhecontrollerbase.Should thecontrollerbase

ller,duetoslippageofthe azimuthclutch,lift

otakeits weightoffthetripodwhilerotatingit

heshouldersengagetheholes.Securethe con-

ethreeknurledthumbscrewsonthetripodtop.

mountsocketcoverandattachittoits

ontroller.

ntcouplingS438atthelowerendofthe

eeofsandor dirt.

eholeinthe sideofthebinocular-mount

sertthebottomof thecolumnintothemount

tilthealigning slotengagesthealigningkey.

tslowly,usingaslightoscillatorymotionof

0tofindwhenthecouplingsengage.Turnbinoc-

33whilepushinginon ituntiltheclampengages

thebinocular-mountcolumninplace.Raisethe

einchwiththecrank.

linkagepinandsetthelinkagein its

cethepintolockthelinkagein thisposition.

headjustinghandlesuntilelevationindex

orthe maximumdistancebetweenthe

bincocularhingeintheslotof binocularmounting

ecesatal owerpositiontowardtheopenyokeof

ewonopensightSl6 asfaraspossible,

astenedtothe bottomofthescrewuntilit is

tbar.Insertthe indexendofthesight barinto

blockslot,andslide thebarintothe slotuntilthe

ointof thebinocularhinge.Tightentheclamp

kappliesmoderatepressureonthe binocular

cularsinplace.

embledcontrolstationbyadjustmentof

piecestoa suitableseparationforthe

nocular-mountheightwiththeadjustingcrank.

lantcontainsthe necessaryfuel,oiland


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N

breakeris intheOFFposition.Complywithin-

ePower-plantOperator'sManual.

lestothejunction-boxreceptaclesat

ssociatedreceptaclesatthepowerplant. The

gsareidentifiedbyplusand minusmarksandby

ys.Itisimpossibleto seatunassociatedpower

mpletely.Locktheplugssecurelyinplaceintheir

-nutclampsprovided.

wercablesusedaffectstheresistanceof

thevoltageatthe searchlight.Ballastresistor

rovidedsothatfixed resistancesmaybeputin

s,tapson thisresistorcanbeutilized tocom-

resistance.Properadjustmentcanbemadeby

heballastunitand attachingthecabletothe

ed"FOR200FEET,""FOR400FEET"or"FOR

gthcableisused.IRRESPECTIVEOFTHE

CABLES,ALWAYSBESURETHATTHE

WHICHENTERSTHETURNTABLEBASE

RMINALSTUDMARKED"FOR600

cablefromthejunctionboxis connectedtoits

bove.

bleplugsandreceptaclesatboththe

tioninthesamemanneras previouslyindicated

ons.Thesereceptaclesandplugsarealso pro-

andkeywaystopreventincorrectconnections.

elocator-cableplugsandreceptaclesat

cator.

srequired thatthelocator,searchlight,and

orientedtoa commonbaseline,andsynchro-

tion.Underthis instructionitisassumedthatthe

ensetup; thatnoparallaxcorrectionisbeingpro-

ll electricinterconnectionshavebeenmade;

;that searchlightazimuthandelevationclutches

HANDpositions;thata-cselectorswitchJ77

on(unlessalocatorsupplyinga-cpoweris

d beinitsEXTERNALposition);thatD.E.C.

ontrolstation isinits AUTOMATICposition;

sareclosed;and thattheamplidyneswitches

scellaneouslightingswitchesareintheirOFF


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HTANDCONTROLSTATION

edthatthepowerplanthasbeenplacedin opera-

ePower-plantOperator'sManual,andthatsupply

werreceptaclesonthe searchlightjunctionbox.

ntPoint

whichtheequipmentcanbe readilyoriented.

shesorientationbydirectingallthepertinent

dadistantpoint,suchas astarora fixedlight,

ved.Sincetheinfluenceofparallaxwillvary

etothepoint used(orientationpoint),chooseas

orientationpointinaccordancewithin-

eOperator'sManualforthatequipment.

atinglamp E30attheelevationcontrol

rakeatthe elevationcontrolbox.

rchlightdruminazimuthand elevation

s sightedatthecross-wireintersection,F23,of

E56atthe elevationcontrolboxtoits

azimuth-scaleclampingscrewsandrotate

zero pointisdirectlybeneaththeazimuthpointer.

escrews.Donotmovethesearchlightfromthe

th-correctorclampT130atthelower

pon beingassuredthatthelocatoris directed

nt,observethepositionofthe searchlight1-

atorpointerontheelevationcontrolbox.Thezero-

ersaremarkedwithluminouspaintand can,

rvedinthedark.With caretakennottomovethe

zimuthposition,observewhetherthe1-speed

theGO RIGHTortheGOLEFTsector.

rectorknobT138inthedirectionindicated

e(clockwiseforGORIGHTorcounterclockwise

ndicatorpointeris alignedwithitscenter

thepointerwillfirst moveawayfromthecenter

en returntothezero pointaftertheazimuth-

rtherinthe samedirection.Thecorrectorknob

ectionindicatedbythezero-indicator-pointer

mentmustbecontinueduntilthezeropointeris

extremelyunlikely,thatuponfirst notingthe

o-indicatorpointer,itwill beatitszero position.

ecorrectorknobineither directiontodeflectthe

proceedasinstructedabove.]Tightenthe1-

clamp.


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N

muthclutchleverA109to itsD.E.C.

loperationmustbeperformedonly

ectorisequippedwithboth1-and 33-speed(low-

nsmitters:loosen33-speedazimuth-corrector

hcontrolbox.Withcaretaken nottomovethe

zimuthposition,observewhetherthepointerof

icatorA43isin theGORIGHTorthe GOLEFT

-speedazimuth-correctorknobA203inthe

correctornameplateuntilthezero-indicator

centerindex.[Ifthepointeris initiallyatzero,or

stobethewrong direction,followtheinstruc-

raph28a(6)in connectionwiththe1-speed

enthecorrectorclamp.Afterthisadjustmentis

evershouldbelefti nitsD.E.C.position,since

tiondisengagesthegearingbetweenthesearch-

muthcontrolbox,thus breakingthemechanical

muth33-and1-speedcontroltransformers.This

ondencebetweenthesetwocontroltransformers.

benecessarytosetthesearchlightat itszero

e1-speedzero indicator,andthentorezerothe

mers.

larlocatorisusedwitha searchlight,

softheelevationtransmittersinthe locatorandthe

mersinthesearchlightasfollows:accuratelyset

vation.

a1-speedtransmitter,placeelevation

itchEl87initsLOWSPEED(1-speed)position.

nthe directionindicateduntiltheelevationzero

rumshouldnowbe atzero-milselevation.

33-and1-speedtransmitters,setthe

ro-milselevation.Placetheselectorswitchinits

osition,andturnthedruminthe directionin-

atorreadszero.The drumshouldnowbeat

withoutmovingthedrum,throwtheselector

osition.Thezeroindicatorshouldstill read

enot met,refertoParagraph64ofthese in-

evationclutchlevertoits D.E.C.posi-

witchatthe controlstationtoitsON

uthand elevationzero-readeroperators'hand-

tilthe control-stationzero-readerindicatorsare

wheelsatthese settings,andpointing


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HTANDCONTROLSTATION

telyinthesamedirectionasthecontrollerhous-

ousinginazimuthwith respecttoitsbaseand

vationbyadjustinghandlesS483 untiltheorien-

hecenterofthebinocularfield.Afteraligningthe

onpoint,repositiontheminelevationto thezero

oindexmarkon gearboxS457withindicator

thebinocularsarenotavailable,theopensight

roximatelythepropersetting ofthebinocular

.E.C.transferswitchS71totheMAN-

and elevationamplidyneswitcheson

positions,standingclearin casethesearchlight

er,thesearchlightwillnotmoveiftheforegoing

andaccuratelyfollowed.

ctionofUnits

orientationpointisnotdiscernible,the

dbytheinterdirectionofunits. Undersucha

sarytoprovidesuitableillumination.Orientation

tsasindicatedbytheprecedingdistant-point

gdetailedexceptions:

dicatedbyParagraphs28a(l) and

rdirectlyatthecenterof thesearchlightdrum;

ghtheorientationsight,ata pointapproximately

enterofthelocator.

containedinParagraph28a(5) toset

azimuthscaleat3200mils (or180degrees),

200mils (180degrees)inazimuthtoread zero,

cator.

lledforinParagraph28a(13)and (14),

d.Withthe elevationandazimuthclutchlevers

othamplidyneswitchesON,andthecontrol-

tchinitsMANUALposition,turnthesearchlight

tionhandwheelssothatitpoints directlyaway

oldingtheoperatinghandwheels,sightthe

cturer'smonogramattherearofthe drumthrough

controllerhousingandelevationmovementofthe

Returnthesearchlighttoitsoriginalpositionby

ositetothatinitiallyemployed.Thismethodwill

justmentofthe binocularswhenthesearchlight

parison.

nt,setupandorientation,acheckoftheequip-


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CHECK

erminethat itisin satisfactoryoperatingcondi-

heckprocedureareas follows:

E.C.transferswitchinitsAUTOMATIC

throughseveralrevolutionsclockwiseandcoun-

lsoupanddowntheelevationrange,andobserve

moflocatorandsearchlightcanbemaintained

iththecontrol-stationD.E.C.transferswitchinits

inewhetherthesearchlightcanbe movedin

entofthecontrol-stationzero-readeroperators'

atthebuzzer-signalcircuitsfromthecontrol

romthelocatorto thecontrolstation,andfrom

htareoperable.

ngthesearchlightbyeitherautomatic

LEAVETHEDRUM,FORMORE

ES,ELEVATEDORDEPRESSED

TALIMITSWITCHISACTU-

approximatelyindicatedbytheeleva-

ositionlimitswitchis actuatedat2200

sitionlimit switchisactuatedat 175

etothedesirabilityoftransportingthe search-

lledinthel amp,anditisthereforeassumedthat,

carbonsarenotinstalled.Priortoinstallationof

heelevationcontrolboxshouldbe placedinits

onmadeconcerningtheapparentsatisfactory

htventilatingmotorandelectricallydrivenlamp

FFthearcswitchaftercheckingfortheabove.

hestotheirOFFpositions,butLEAVE

ATIONCLUTCHHANDLESINTHEIR

edrumat itszero-elevationposition.Operate

engagedposition.Lightthe recarboninglamp

tdrumdoorfor accesstothedruminterior.

tlinedand illustratedbyFig.17.CARBONIN

AIROFCARBONS.

L384onthe lamp.Insertapositivecarbon

gofthefront glassdoorandthehole inthelamp

muntilitprojectsfrom%toJ inchbeyondthe

nosecap.Rotatethecarbontofacilitateentry

hes.Operatethepositivelevertoengagethe car-

rollers.

ersin openpositionbypushingforward


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HTANDCONTROLSTATION

n

y

-

m

everassemblyL410tothe positionshownin

nd ofanegativecarbonthroughthenegative

4inchfrom thetipofthe positivecarbon.Operate

gethecarbonwith thenegative-feedrollers.Close

erecarboning-lampswitch.

rake,andpositionthesearchlightin both

hatthezero-indicatorpointersare approximately

plidyneswitchestotheir ONpositions.

ORSUDDENMOVEMENTOF

THESESWITCHESAREOP-

rchlightvoltmeterindicatesapproximately

mmeterisatitszero point.Anyrequiredvoltage

eatthepowerplant inaccordancewithinstruc-

er-plantOperator'sManual.Failureoftheam-

equire adjustmentoftheammeterpointer.

ofground-glassfinderF29 andpeep

-drivecrankL168andpositive-feedbutton


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NTOFCARBONS

smboxareintheir lower,orout,positions.Also

ate-adjustmentknobL232onthelamp-mechanism

mumfeed.

ons

engthcarbonswhenrecarboning.Entranceto

hroughthe leftdrumaccessdoorinorderto avoid

nteringthe drum,takecarenottodrop carbons

when removinghotcarbonstubs;andhandle

voidbreakage.Onlyspecialhigh-intensitycar-

slamp.

leverbypushingits lowerendtowardthe

ouldberemovedby meansoftongs.Caution

ngthestub,toavoidthepossibilityof thestub

eheadanddroppingonthemirror.Spreadthe

apartbyraisingthepositive-carbonclamping

rbonwithapair ofrecarboningtongs.Tofacili-

arbon,it issuggestedthattheendof thenew

ed endofthepositivehead,and bepushed

ed stub.Thenewcarbonshouldbepushed

ecarbonprojectsbeyondthepositivenosecap

h.In theinitialposition,thenewcarbonwill

gatthecenterof thefrontdoor.Re-engagethe

sitive-carbonclampinglever.Insertthepointed

rboninto therearofthenegativehead,and push

s within^inchoftouchingthepositive carbon.

oorsarefullyclosed.

l

videdfurnishestwomethodsforremotedirec-

CDISTANTELECTRICCONTROLand

ICCONTROL.Thatis,thesearchlightmay

aticallyfromthelocatorormanuallyfromthe

guponthesettingofthe transferswitchatthe

ainswitchshouldbeONwhilepre-

ngtracking.Thisis necessarytopro-

ndthe indicatingsystemssothatthe

alignmentwiththe locator.

18and19indicatethe locationsofthevarious

hallbereferredto.In caseoffailureofthe

lightmaybeoperatedbyhandbyuse oftheex-

ricControl

iresthat:a-cselectorswitchJ77be inits


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CTRICCONTROL

lstation


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HTANDCONTROLSTATION

Control

ontrolstationfortrackingthetarget and

cator.The sameequipmentsetupasaboveexists

hattheD.E.C.transferswitchshouldbein its

o-readerinstrumentsatthecontrolstationwill

mbetweenthelocatorandthecontrolstation;

mentsatthesearchlight(onthe elevationcontrol

nismbetweenthecontrolstationandthesearch-

oper procedureforManualD.E.C.operation:

E.C.withhand-controloperation.

trackedbythelocator,theazimuthand

ratorsatthecontrolstationshallobservemove-

nstrumentpointers.Maintenanceofsynchronism

ontrolstationisindicatedbythe centering,or

r-instrumentpointers,andissecuredbymoving

s'handwheels.Forpropersynchronization,move-

ustbein thedirectionindicatedbytheinstruction

nstrumentwindow.Thatis,tomovethezero-

t,i tsrespectivehandwheelmustberotated

ockwiseforaleft-handmovementofthepointer.

an oppositedirectionitindicatesthatthetrans-

e controltransformeratthecontrolstation

ase.Correctionforthisconditionisobtainedby

ntinuouslyinonedirection,whichwillcausefirst

tionandthenanultimatereturnto thezeroposi-

-operators'handwheelsassmoothlyand

tofacilitatethetargetpickup.Thisis particularly

arc strikeinorderto minimizethejumpwhich

pply voltagemomentarilydecreasing.

rshouldstandby hisstationatthebinoc-

yreadilyobservetheilluminatedfieldwhenthe

cis struck,theobservermustcarefully

throughthebinoculars,inorder toascertainthe

uctionsforstrikingthearc andoperatingthe

h32 whichfollows.

otseethetargetimmediately,thezero-

xplorethefieldaroundthe positionindicatedby

irhandwheelsS258andS348,so thattheinstru-

wlyfromonesideto theotherofthezero index.

eenpickedupbytheobserver,he should

targetwiththe observer'shandwheelsSi85

zimuthhandwheelisprovidedwitha two-

edbyplungerSi88 passingthroughtheknob


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TIONALCONTROL

eeddrive,whichisengagedby pressingtheend

screwhead,is particularlyusefulinfollowing

gtarget.

owed,thebinocularsmaymovefromthe

rallaxbetweenthesearchlightandthe control

htontotheil luminatedfieldagainbymovingthe

byadjustinghandlesS483.Thesehandlesmaybe

ocularsbothin azimuthandelevation.Such

slightlyaffectthealignmentinelevationbetween

ntrolstation.

odsofD.E.C.

rationsitwillbeessentialthat transferbe

ethodsofcontrol.Thistransfermustbe accom-

ovement,orjump,ofthe searchlightbeamto

cedurefortheD.E.C.transferis outlinedbythe

pmentisoperatedfromthelocatorwith

tatargethasbeenpickedup bythelocatorandis

hlight,itmaybe desirabletoreleasethelocator

ethe searchlightandcontrolstationcontinue

This transferisobtainedbyturningcontrol-

tchS71totheMANUALposition.Detrimental

ebeamcanbepreventedif thezero-readeropera-

onthe azimuthandelevationzero-readerinstru-

istransfer.The aboveprocedureisfollowed

mpislightedor isnot.

maintainedunderManualD.E.C.andit

utomaticD.E.C.,itis essentialthatthecontrol

esodirectedthatthe zero-readerinstrumentsat

zero orthatthelocatoris broughtbackinto

controlstation.Suchreadingswillshowthat

rchlightandthelocatorare insynchronism,

vementwilloccuratthe timeoftransfer.After

tozero, turntheD.E.C.transferswitchto

rol

nddirectionalcontrolofthe searchlightcanbe

wingmanner:

azimuthclutchleversin theirHANDposi-

muthandelevationamplidyneswitches.Re-

dinserttheextendedhandcontrollerin itssocket

x.Applyaslight pressuretowardthesearchlight

untilthecouplingsmateand thelatchfallsintoits


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HTANDCONTROLSTATION

sproperlyengaged,thesearchlightwillturn

ationofthe handwheel.

controlofthesearchlightmayfollow

mentoftheextendedhandcontrollerkeepingthe

reader-instrumentpointersontheirzero positions.

struckandthetargetpickedup,manual

earchlightshouldbecontinuedbydirectobserva-

f byinstrumentindications.

orthreemethodsoflampcontrol,designated

atic,andmanual.Theautomaticcontrolisintended

emiautomaticandmanualcontrolsprovidemeans

fthelampin theeventoffailureofcertain features

eference,Fig.20indicatesthelocationof the

ampoperation.Underanycondition,makesure

arboned.(Referbacktocarboninginstructions

30.) Neverstartanoperationunlessthepositive

toprotrudeatleasttwoinchesfrom thefeedend

defrom%toJ inch beyondthenosecap.The

minalvaluesof150 amperesand78voltsas read

ents.Themethodofsettingthe abovecurrentis

efollowinglamp-operationmethods;andthe

cribedforthepowerplantby thePower-plant

ependsuponproperpositioningoftheposi-

adbeamtheoperatorshouldfrequentlycheck

tivecratertipismaintainedcloseto theblackor

assfinder.THEPOSITIVECARBONSHOULD

BURNBACKBEYONDTHEREDOR

alsodependentuponmaintenanceofproper

sshouldbecheckedfrequently.Theadjustmentis

0oftheseinstructions.CAREMUSTBEEXER-

THEPOSITIVECARBONREMAINSOF

LURETOOBSERVETHISPRECAUTION

IVECARBONBEINGFEDTOTHE

GQUICKLYBURNEDTOSUCHAN

HLIGHTWILLBECOMPLETELYOUT

ol

iresthatpositive-drivecrankL77,positive-

ative-drivecrankL168beintheir out,orlower,

edrate-adjustmentknobL232beatitsmininium-


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OL

m

-glassfindercoverF34andpeep-sightcoverF82

maccessdoorsbeclosed.Operationprocedureis

eE217).Theventilatingmotorand the

lstart rotating.Thelampmechanismwillauto-

ecarbontostrikethepositivecarbon,andthen

egativecarbontoobtainalampcurrentin accord-

djustmentofthis setting,whichshouldbefor150

tammeter,ismadeatthe lampcontrolbox,andis

raph68 andintheMaintenanceManual.


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HTANDCONTROLSTATION

rcstrike,observethroughthe peepsight

positivecarbonhasremainedapproximately

thatitis notbrokenbadlyenoughtoendangerthe

seof abadbreak,thepositive-feedrateknob

etoitsmaximum-feedposition,andthepositive-

rpositionandrotatedrapidlytobring thepositive

dthepositivenosecap.When thepositivecrater

ositive-feedrateknobshouldbeset backto

e-drivecrankreleased.

oes notautomaticallypullawayfromthe

touch,thenegativecarbonshouldberetractedby

e-drivecrankandturningitcounterclockwise

50amperes.Thenthenegative-drivecrankmay

utomaticcontrol.Ifthecarboncannotbere-

htoOFF,enterthe drum,disengagethenegative

s,andreengagethe negativecarbon.Closethearc

ethermostatpreventsunderfeedingof

esnotpreventoverfeeding.Ifthe pro-

onincreasesbeyondtheusual %to

ive-feedratebyturningthe positive-

inimum-feedposition.

s'operation,theimageofthepositive

sfinderdoesnotterminateat theblack,orfocal,

sight andobservewhethertheprotrusionofthe

oximately%inch.If theprotrusioniscorrect,

ngknobR50to bringtheendofthe imageonthe

hangefromthissettingduringoperation,immedi-

ositive-carbonlengthbyobservingwhetheritis

ead.Ifthepositivecarbonis longenoughtoro-

offthefocalline, resorttosemiautomaticoperation,

gsubparagrah.

minatingagreaterfield atshorterranges

nedbyturningthefocusingknobina counter-

movingthelampclosertothemirror.Afterthis

andredli nesontheground-glassfinderno

ce.Theoperationofthearc,therefore,mustbe

throughthepeepsight.

ontrol

ouldfail,the lampstrikeisunaffectedand

memannerasforautomaticlampcontrol;the

arbon,however,mustberegulatedbyturning

bclockwisetowarditsmaximum-feedposition.

ocausethepositivecarbonto feedatsucharate


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L


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NDTECHNICALDESCRIPTION

descriptionprovidedbythissectionrelates

stemsofthe generalsearchlightequipment.It

cquaintthereaderwith allessentialfeatures

hegeneralsearchlightequipmentisdividedinto

eyaretheGeneralArcSystem,the Zero-reader

ectric-controlSystem.Eachoftheseprimary

therbreakdownintoitssubsystemsandassemblies.

mofgeneralarcsystem


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HTANDCONTROLSTATION

stem

cludes:thesearchlightlampandlamp-con-

witch;searchlightpowerinstruments;theven-

ilspertainingtothe lampanditscontrol;and

quiredinthegeneral-arc-systemcircuit.Fig.21

eabove-mentioneditems.Referencetothisfigure

mbolswillbe madethroughoutthissubsection.

mpleteconnectiondiagramandschematicwiring

chlightequipment.

ositive-carbonrotationandforpositive-and

escribedinthefollowingtext.Notethatthe method

hepositiveand negativecarbonsemployscontact

mpheads.Feedrollers,gearing,gearing-support

noseareinsulatedfromthe current-carrying

s insulationpreventsarccurrentfrombeing

er

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AMPASSEMBLY

-


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LAMPOPERATION_

isobtainedbypropersetting ofthe

mentknobL232which,throughan eccentric

utomatic-feedcontactsL245andL246.These

greaterorlessrelativetimeof contactagainstfeed

ositive-feedmagnetfora correspondingperiod

c-feedcontactsL245andL246arein parallel,

atcontactsL441andL442(Fig. 21)sothateither

matureL273.

anualfeedisas shownfortheautomatic

atpositive-feed-magnetarmatureL273ismanual-

dbuttonL276.

utomatic-feedandretractiondriveis

pmotorLa4. Thelamp-motordriveisthrough

tonegative-clutcharmatureL151.Thenegative-

slideonthedriveshaft whichcarriesbevelgear

haftsothatit rotateswithit.Inits normalposi-

tcontactnegative-drivediskLl63a.However,

orthefeedcoil isexcited,thearmatureispulled

scontactwith diskL163adrivingitin eithera

kwisedirectiondependingonwhichcoil is

ounterclockwiserotationofthenegative-drive

rodL6,bevelgearsL4 15andL 416,wormL4 17,

tive-feed-rollergearsL403,andfinallytonegative

withthe negativecarbon.Thenegativecarbon

ed toward,thepositivecarbon.

anualfeedorretractionis asdescribed

rbonautomaticfeed,exceptthattheinitialdrive is

rotationofnegative-drivecrankL168andbevel

hare engagedbypushinginthenegative-drive

tion

luminousballofvapor,whichis formedin

arbon,atapresetpoint inrelationtothepositive

,thisis performedbyutilizingtheheat

onto controlpositive-feed-magnetarmature

used bymeansofthermostatmirrorL435(refer

heyareproperly directedonthermostatbimetal-

hesestripsbendwith heatandaresoassembled

nttemperature,thebendingis thesameinboth

hstripcarriesa contact;thesecontactsactasa

-magnetcircuit.Themirrorandthermostatare


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HTANDCONTROLSTATION

the positivecarbonthat,whenthepositive-

oint,theheat raysareequallydistributedonthe

ngeachstripanequal amountandbendingboth

ee.Underthiscondition,thethermostatcontacts

rcuitto thepositive-feedmagnetopen.The

gagedposition.Astheedgeof thecraterburns

thattheyaremoreonthe rightbimetallicstrip

windowinthe thermostathousing)thanonthe

ght striptobendmorethan theleftsothat the

handclosethecircuittothepositive-feedmagnet

ve-feed-magnetarmaturecausesthedetentto

eel,andthuscausesthe positivecarbontofeed

onfeedsforwarduntiltheheatraysagain fall

heats theleftstripand allowstherightoneto

hermostatcontacts,andtherefore,thecircuitto

Whenthefeedmagnetopens,thedetentdisengages

dthefeed ofthepositivecarbonisstopped.


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DCONTROLSTATION


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HTANDCONTROLSTATION

whichisdescribedbythedirectlyfollowingpara-

derautomaticoperationduetothe factthatthe

edcontactsL245andL246isinparallelwith the

enthethermostatcontactsarenotclosed,thefeed

peratedbytheactionofthese positive-feedcon-

ttentpositive-carbonfeed.Therateofthe feed

ob L232,butshouldneverbesetat suchahigh

ngofthe positivecarbon.Overfeedingisacondi-

erateoffeed isgreaterthantherate ofburning.]

operation,thethermostatandelectric

onsideredinoperative.Insteadofthermostat

dthroughpropersettingofpositive-feedrate-

chpositionsthepositive-feedcontactsin

losingthemand energizingthepositive-feed

dthussuitablypositioningthepositivecarbon.

n,properfeedingofthepositivecarbon

agraph37d.Note thatcontrolisprovidedonly

tivecarbon,andthat thepositivecarboncannot

eenoverfed.

rent

enegativecarboninsuchapositionwith

bonthata nominalcurrentof150amperesatthe

aintained.

hecurrentthroughthe arcdecreasesas

rclengthisthe distancefromthenegative-carbon

rater,andtheproper arclengthissuchas to

he searchlightammeterof150amperes.To

rrent,thenegativecarbonis fedforwardorback-

emechanismwhichhasbeendescribed.The

sbyarc-currentregulatorLaithroughwhich

edandretractcoils indriveclutchLa2isobtained.

magnetcoil,a pivotedarmaturewhichisat-

ullofthe coil,aspringwhichopposesthemagnetic

ontactsL100,L101,L102andL103,whichare

ntofthearmature.Whenthearccurrentis atthe

cpullonthe regulatorarmatureisexactlybal-

gulatorspring,andtheregulatorcontactsarenot

onisprovidedforeitherclutchcoil,andthe

tchtothe lampisstationary.Asthenegative

lengthincreasesandthecurrent throughregu-

RefertoFig.21),therebydecreasingits magnetic

pringovercomesthemagneticpullofthearma-

1andL102on theregulatorareclosed.These

cuittofeedcoilLl46a,causingtherevolving


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AMPOPERATION

akecontactwiththenegative-drivediskandfeed

rd.Asthecarbonmovesforward,thecurrent

untila balancedconditionexistsandthefeed

herebystoppingtheforwardmotionofthecar-

tionablepeaksofcurrentatthearclamp,retract

reverseoftheaboveprocess,causingthenega-

nuntilthe balancedconditionisreached.When

hroughthe regulatorcoil,thepullofthe spring

eedcontacts.

phexplainshowthesettingof thearc-

titsperformanceand,therefore,thearccurrent.

yintendedtogovernthe arccurrent,sothatthe

btained.Detailedinstructionsconcerningthe

orarecontainedinthe SearchlightandControl

ual.

withanegative-carbonhand-feedcontrol

ventoffailureof theforegoingautomaticsystem.

ebeengivenaboveunderParagraph37ffor

tivecarbon.Electriccontrolunderthiscondition

L174whennegative-drivecrankL168(Fig.23

eration.Thisswitchconsistsofa metalwasher

chengagesacontactpointon theterminalblock

e negative-driveclutchassembly.

maticallywhenthearcswitchis closed,

-drivecrankispushedin.Inautomaticoperation,

ed,the negativecarbonisquicklydrivenforward,

tsL101andL102controllingthefeedcoil are

ined.Whenthenegativecarbonstrikestheposi-

ighcurrentcausesthearc-currentregulatorto

ontactL100whichenergizestheretractcoilof

egativecarbonisretracteduntilthecurrent

nedbythe settingofthearc-currentregulator.

nthecurrentishigh,as atthetimeof arcstrike,

steadoftheregularretractcontactLl00.The pur-

actL103is toreducetheresistanceinserieswith

neticclutchinordertocompensateforthedrop

hehighcurrent.This insuressatisfactoryopera-

themagneticclutchduringthestrikingperiod.

uponopeningthearcswitch,thenegative

hepositivecarbon,whichwillallowaquick

krestrikingofthe arcisdesirablesothat the

ptlyafterithas beenpickedupbythelocator.)

s follows:

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HTANDCONTROLSTATION

opened,boththeventilating-fanmotor

motorbegintocoasttoa stop,whiletheregulator

Theventilating-fanmotorasitcoastsgeneratesan

feedcontactsontheregulatorareclosed,the

beactuatedbythiscurrentand willcausethe

otatingasthelamp-mechanismmotorcoaststo

dgearingina directiontofeedthenegativecar-

oncontrolbox,illustrated inFig.25,isa

tructedtoprevent'excessivecontactburning.

k-breakfeatureofthisequipmentprovidesfor

forclosingandopeningthe arccircuit.

ruments

rumentsattheelevationcontrolbox(See

ationofthe lamp,lamp-control,andventilation

mmeterandvoltmeterarerespectively0-300-

oving-coilinstruments,suitablefortheoverloads

earchlightoperation.Eachinstrumentscalehas

lineat thenormallamp-operatingpoint,andeach

hanexternalzero-adjustmentscrew.

a ventilatingsystem,shownbyFig.26,sothat

drum arecontinuouslysweptwithfreshair.The

esforadequatecoolingofthelamp-controlmech-

hrougha labyrinthinthelamp-control-box

mpisprovidedby astreamofair throughthelamp

sitivebrushesandthenose cap.Airisdrawnby

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HTANDCONTROLSTATION

dintherotor toapproachzeroandthenreverse

fthetransformerrotorlags inacounterclock-

Fig.29,the instantaneouspolarityoftheout-

meastheinstantaneouspolarityofthetrans-

mentsaretwo-elementmetersinwhichthefield

eelectricallyisolatedbutmagneticallycoupled

gofeachinstrumentisconstantlyexcitedfrom

xcitesthetransmitterrotor. Thearmaturewinding

imitedangleandthe indicatingpointerisfas-

rmaturewindingof eachinstrumentiscon-

espectivecontrol-transformerrotor.Thenormal

ointeris atthecenterofthe scale,thusindicating

armatureofthe instrumentiszeroandthat

ed.Conversely,deflectionofthepointerindicates

ure.

being controlleddirectlyfromthe

andthelocatoris movedinrelationtothe

pliedtothe searchlightzero-indicator-instru-

chlightismovedto followandcatchupwiththe

dtotheindicatorinstrumentarmaturewillbe

being controlledfromacontrolsta-

ementofthelocatorcausesavoltagetobeapplied

reader-instrumentarmature.Ifthecontrolsta-

catchupwiththelocator,thevoltageapplied

ducedtozero,regardlessofthesearchlightposi-

he pointermoveswilldependupon

neouspolarityofthe a-cexcitationtothecontrol-

e.Themagnitudeofthisvoltageisindicatedby

ris deflectedineitherdirectionfromthezero

bedeterminedfromthepositionof thepointer

limitedextent,howmuchtheequipmentmust

lignment.Thepointerandthescaleof thezero

ithluminouspaintinorder thattheymaybeob-

use ofscalelights.

s

mapartofthe zero-readersystem:

-adapterrelay(Jf)andresistor(J34and J35)


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ISCELLANEOUSDEVICES

x,Fig.4,are providedtomaintainapproxi-

yvoltagetothe dynamotorundercontrol-loadand

ation.Sincetherelaywindingisinthe searchlight

herelay contactsareclosedunderarc-loadcon-

control-loadconditions.Theresistoris placed

ycircuit,andis cutoutofthe supplycircuitunder

closingofthevoltage-adapter-relaycontacts.

matelyconstantdynamotorsupplyvoltage.A

dedon thisresistorsothat thepropera-cvoltage

ormaybeobtainedundercontrol-loadcondi-

hrowselectorswitch(J77)forcontrolofthe

dinthe junctionbox.Inadditiontocontrolling

hprovidesforconnectingthesearchlighta-c

ceofalternatingcurrentwhichmaybe furnished

externala-cisused,the switchisthrowntoits

hedynamotordoesnotoperate.

use(J60)forthe a-csupplyisinthe junction

E30)forindicatinga-csupplyavailabilityis

ntrolbox.

o preventthedynamotorfromdrawingex-

alsoin thejunctionbox.

isprovidedin theelevationcontrolboxfor

zeroindicatortoeitherthe1-speedor the33-speed

heconnectiondiagramandschematic

researchlightequipment.

TROLSYSTEM

D.E.C.

htdiffersfromtheprecedingsearchlight

toits methodofdistantelectriccontrol(D.E.C.

eseinstructionscoversadescriptionofthe means

gthesearchlight.Itisimportantthatthe oper-

efundamentalsofthis controlsystem.

rentby observingthesearchlightinopera-

distinctivefeatures.Itpermits rapidacceleration

chlightinazimuthandelevationin orderthata

getmaybemorereadilyfollowed.Itprovides

ng,steplessspeedsfortrackinga distantor

nchronization,ormeansbywhichthe searchlight


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HTANDCONTROLSTATION


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HTANDCONTROLSTATION

matControlStation

ftheD.E.C.systematthecontrolstationinclude

rol-stationcontroltransformerswhichwerede-

onwiththeZero-readerSystem;fordrivingthe

ers;andformovingthecontrollerhousingin

rsinazimuthandelevation.Thesemovementsare

dwheels.ThemechanicaldevicesforD.E.C.atthe

nFig.32, andoperateasfollows:

andbinocularsarerotatedin azimuth

operator'shandwheelS258,bevelgearsS250and

86,wormgearS308a,clutchS306,shaftS298,

yringgearS37. ClutchS306,justreferredto,per-

tobe movedinazimuthindependentlyofany

drivesideofthegeartrain. Thepurposeforsuch

ybeendiscussedinParagraph28underorientation.

beshiftedinazimuth withrespecttothecon-

lutchS447,for correctionofparallax,asalso

smovementisnotlimitedbystops,butattention

fectofsuchazimuthmovementonthepositionof

.

andbinocularsmayalsobe rotatedin

rver'shandwheelS185,throughclutchS222,and

,or S233andS261,dependinguponthedrive

sso arrangedthatshiftingplungerS188in the

angesthespeedratiobetweenthehandwheel

nazimuth.Fornormal,or distant-target,track-

positionedthatitssmoothend willbeflushwith

scase,thedrive isthroughbevelgearsS220and

o1.Whenrelativelylow handwheelspeedac-

trackingisdesired,theplungeratthe handwheel

ositedirection,thusengagingtheclutchwithbevel

rivesshaftS260throughbevelgearS261,giving a

freelyonshaftS260,is drivenfromthis

andgearsS280,S293b,S293a,andS276. The

o preventexcessivelyrapidaccelerationsandde-

ghtinazimuthunderManualD.E.C.operation,

esmoothcontrolofthe searchlightmotionin

frictionclutchin thegearingtotheflywheelis

bserver'shandwheelinits low-speedratio,itis

vertoaccelerateanddeceleratetheflywheelas

Thispermitsthesearchlightto bemovedmore

werepositivelygearedtoshaft S260.


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RIVESUBSYSTEM

smitterSa5aisdrivenin fixedrelation

wormS286,wormgearS308a,andgearsS308b

uthcontroltransformerSa6aisgeareddirectly

gearsSi7laand SlS0a.Nohand-operatedad-

eitherthetransmitteror thecontroltransformer.

adjustmentsaregivenintheMaintenanceMan-

movedin elevationaboutshaftS470

69,wormS461,shaft S442,gearsS55,S381

94andS372, shaftS350,andzero-reader'shand-

gearsS376andS351, orobserver'shandwheel

S327andS351. Thepositionofthebinocular

tS470maybe changedbylooseningthetwo

chS478.

freelyonshaftS350,is drivenfromthis

69,S388b,S388a andS366.Thisflywheelpre-

celerationsanddecelerationsofthesearchlight

D.E.C.operation,and,ingeneral,promotes

chlightmotioninthis typeofoperation.

nsmitterSa5bisdrivenin fixedrelation

wormS374,wormgearS406,andgearsS409

vationcontroltransformerSa6bisgeareddirectly

gearsSl71band SlSOb.Neitherthetransmitter

dedwithany hand-operatedadjustments.In-

djustmentsaregivenintheMaintenanceManual.

cularmountwithrespecttothecon-

stedto suittheobserver.Thisis accomplished

ormS428,wormgearS425b,pinion S425a,

m

bsystem,whichisshownin Fig.33,comprises

vingthesearchlightin azimuthandelevation.

riveninazimuthand elevationbythedrive

hichhasalreadybeendescribed.Thepowerto

nishedbytwo amplidynemotor-generatorsets,

irectlydrivinganamplidynegenerator.The

theoutputcurrentof eachamplidynegenerator

uppliedtoits controlfield.Thesourceofthis

edin alaterparagraphofthis section.


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EMOTOR-GENERATOR

oad.Thevalueof thiscurrentisdirectlypropor-

tageandinverselyproportionalto thearmature-

rentthroughthearmaturewindingsproduces,

agneticlinesof force)whichisalwaysatright

lux;itis stationary,eventhoughthearmatureis

eforcethatproducesthisarmaturefluxiscalled

theordinarygenerator,isa nuisance,preventing

mptsusuallyaremadetoneutralizearmature-

lidynegenerator,however,thisarmature-reaction

.

ort-circuited,theexternalresistance

alarmature-circuitresistancewouldbeverylow.

recurrentisinverselyproportionaltothis

ta verysmallcontrol-fieldfluxwouldcause

d,consequently,ahigharmature-reactionflux.

hastobuild uponlytoa lowvalueandthe

cuitedarmatureisverylow,fullloadcurrentwill

nallyshorttime.

fluxmaybeutilizedbyaddinganother

lestotheshort-circuitedbrushes,asshownin

mature-reactionfluxinducesavoltageinthearma-

"load-axis"brushes.Ifa resistanceloadis

xisbrushes,thecurrentthroughthisloadwill

mplitude,thefluctuationsofthe currentflowing

oil.

TIONAL

DGENERATOR

....

AD

YNEGENERATOR

generatortheory


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HTANDCONTROLSTATION

eratureofthecathodeto thepointwhereitfreely

shell surroundingthecathode.Aslong

atapositivepotentialwithrespectto thecathode,

mthecathodewillbeattractedto theplate.The

thecathodeto'theplate constitutesanelectric

flow,fromtheconventionalviewpoint,isopposite

theelectriccurrentflowsfromtheplateto the

spiralwindingof wireextendingthe

edbetweenthecathodeandtheplate.The spacing

comparativelylarge,so,mechanically,thecon-

ablyobstructtheelectronflow.Thepurposeof

ol,electrically,theflowofelectronstotheplate.

egativepotentialwithrespecttothe cathode,the

reduced,sincethenegativechargeonthecon-

electronsbacktowardthecathode.Asthecon-

glynegativerelativetothecathode,theelectron

dwhenthegrid ismadelessnegative,theelec-

ce,whenthecontrol-gridvoltageisvariedin

theplatecurrentalsovarieswith thesignal.Be-

voltagecancontrolacomparativelylargeamount

s "amplified"bythetube.

spiral windingofwireplacedbetween

ate.Itismaintainedat apositivepotentialwith

tsinceits turnsareshadedfromthecathodebythe

elyfewelectronshitthescreengrid.Hence,the

omparedwiththeplatecurrent.Thepurposeof

theplatecurrentpracticallyindependentofthe

ratingrange.Thescreengrid alsoactsasanelectro-

ontrolgridandthe plate,thusreducingthegrid-

esetwoeffectsallowgreateramplificationtobe

es(8a)areverticalmetalshieldswhich

reengridandthe plateatoppositesidesof the

-formingplatesareinternallyconnectedtothe

eseplatesisto concentratetheelectronsintoa

scomingfromthecathodehittheplate athigh

edislodgedfromthemetaloftheplate. Theseare

rons,andthephenomenonassecondaryemission.

omthecathodetravelto theplateina well-de-

yelectronsarerepelledbacktotheplate.Other-

dtraveltothescreengrid, therebyloweringthe

ngthescreen-gridcurrent.

hotduringoperation,andcautionshould


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HTANDCONTROLSTATION

omthecorrespondencepointislessthanthe above

iseffectiveincontrollingthe system.Atthesame

signalisalsobeing appliedtothecontrol-grid

henthedisplacementfromcorrespondence

alue,the 1-speedsignalisofsuchmagnitude

hecontrolsystemis notappreciablyaffectedby

edsignal.

ManualD.E.C.

endesignedsothatthe searchlightwilloperate

ombined1-and33-speedcontrol,orwith1-speed

emoperatessolelywith1-speedcontrol.No

orusingthe 33-speedcontrolalone.

ithmostautomaticcontrolsystems,tendsto

epointof correspondenceunlessmeansarepro-

dency.Huntingisdueto thefactthat,asthe

ecorrespondencepoint,theoutputvoltagesofthe

easeuntiltheyreachzeroatthepoint ofcorre-

powerinputto thedrivemotordecreasesuntilit

encepoint.However,theinertiaofthe rotating

htslightlybeyondthepoint ofcorrespondence.

tputvoltagesofthecontroltransformerstoin-

snowsuch astocausethesearchlighttobe driven

spondence.Repetitionofthisactionconstitutes

einertiaoftherotatingparts ofthesearchlight,the

dynegeneratorisappliedto theantihuntcircuit

ctionsaresomadethat thepolarityofthisanti-

hasto opposethecontrol-transformervoltages

agramoftheD.E.C.ProtectiveSubsystemis

ystemcomprisesanetworkof miscellaneous

elaysasdescribedbelow:

kswitches(F10,Fll)aremountedatthe

angedthatitis necessaryforbothofthedrum

ther theazimuthorelevationD.E.C.system

itchesareprovidedtopreventaccidentaldirec-

henanoperatorisinsidethedrum.

134ismountedinthe azimuthcontrolbox

zimuthclutchleverto theD.E.C.position,it

eazimuthcontrolcontactorA28.Theprime


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TVESUBSYSTEM

mofprotectivesubsystem


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NALPRECAUTIONS

lows thesystemtooperatesoas todepress

tswitchE399a.Asimilarconditionoccurswhen

htocloselower-limitswitchE399b,thereby

ingseleniumrectifierE38()b.

minthe amplidynegenerator,thedrummay

switchhas closeduntilitcomestorest against

actionisnormalandwill notharmtheequipment.

S44whichmaybelocatedinthe main

cdiagrams(Fig.71and72),arelocatedinthe

ndthecontrolstation,respectively,andarecon-

uzzersareoperatedby meansofbuzzerswitch

r byabuzzerswitchat thelocator.Thepurpose

providemeansforsignallingfromthe control

rfrom thelocatortothesearchlightandcontrol

eprotectivedevices,eachamplidynemotor-

witha thermostaticallyoperatedoverload

hisisa single-pole,single-throwswitchmounted

ectedtoterminalsOLlandOJL2.The switchopens

eraturereachestoohighavalue,andreclosesauto-

coolsdown.

onamplidynemotorisin serieswiththeeleva-

switchC265intheazimuthamplidyneis inseries

ecircuit.Operationoftheswitchopensthe

ntrolcontactor,renderingthecorresponding

e.

s

kswitcheswhichcomprisetheProtectiveSub-

eprotectionagainstinjurytopersonnelordamage

properoperation,theycannottakethe placeof

art oftheoperator.Twopointsareparticularly

HDRIVESTHESEARCHLIGHT

ONHASSUFFICIENTPOWERTOIN-

APERSONINAPOSITIONTOOB-

ESHOULDBETAKEN,THEREFORE,

RECLEAROFTHESEARCHLIGHTWHEN-

ELYTOMOVEUNDERD.E.C.OPERA-

movingrapidlyin eitherazimuthor

440voltsmayexistinthedrivecircuits.These

dbytheamplidynegenerators,andarecarried

tbythewiringhavingits terminalsmarkedCl


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TANDCONTROLSTATION

onchii

onb*sc

nlumUblc


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ON,TABLES


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HTANDCONTROLSTATION

oncontrolsbtion

oncontroller


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TROLTRANSFORMER

elevationhigh-ipeedcontroltraniformer

-cyclea-cpowersourcetopoints51

edwire(jumper)frompoint 51to

aybeused asthesourceofa-c

supplytoit andplacingthea-cselectorswitch

osition.Thed-csupplyshouldbe suchthat


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HTANDCONTROLSTATION

gagesin position

olts

eadwithrespectto thepositive.Theproper

yinsertingthealignmentgagesinto thelamp,

houlderattheendof thetaperedsectionofthe

houldbeflushwiththe frontofthepositivenose

everL410asecuredasindicated,turnnegative

negativegageuntilitstaperedtip justtouches

tivegage.Thebottomedgesofthetwotips should

tip shouldbeonaverticalline throughthecenter

etyprecaution,nod-cpowershouldbesupplied

eckingthealignment.

sion

ation,thepositivecarbonshouldproject%

osecap.Ifthe protrusionofthepositivecarbon

tatmirrorL435should beadjustedasfollows:

tweenthe positiveintermittent-feedcontacts

dL243in thelamp-mechanismbox,Fig.65.

easttenminutes.Whilethearc ison,

matureL273ofthe positive-feedmagnetLa5

nearlyregularintervals.Ashasbeen explained


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TANDCONTROLSTATION

thatitdoesnotslip duringnormaloperationof

zero-reader'shandwheels.Ontheotherhand,it

preventthe controllerhousingfrombeing

gorientation.Toadjust theclutch,itis necessary

o-readerinstrumentanditsmountingbracket

gonalnutS304which isonverticalshaft S298

gpressure.

th-flywheelClutch

gearingtotheazimuthflywheel,S273,should

server'shandwheelinitslow-speedratio,it is

vertoaccelerateanddeceleratethe flywheelas

Toadjustthis clutch,turntheroundknurlednut

ngthe clutchspringpressure.

teallcircumstancesandcombinationsofcir-

usefaultyoperationofthesearchlightequipment.

andtheircorrectionsmentionedin thisManual

beeasilydetectedandwhichcanbe correctedby

moredetaileddiscussionoftroublesand their

uldbemadetotheMaintenanceManual.

rovidedinthespare-partsandtool boxisa

mmeter,andohmmeter.Itwill befoundindispen-

ndcheckingthe variouselectriccircuits.This

eable tocheckallthe differenttypesofcircuits,

ngesofsensitivity.Caremustalwaysbe exercised

rlyconnectedandadjustedfor measuringsafely

s,currents,orresistancesdesired.A frontviewof

g.57.

readings,connectthetestleadsto the

NEG.TurntheA.C./D.C.knobtothe desired

eselector (thelargecenterdial)to thedesired

sured.In casethevoltagetobe checkedisun-

000 voltsandreducetherangesuccessivelyto

ts,or2.5volts,ifthe priorreadingindicatedthat

tbe greaterthanthehighestvalueofthe next

gd-cvoltage,makesurethatthe POScordgoes

circuittobe read.Besuretoread theproperscale.

rrentnot inexcessof10amperes,con-

erminalsmarked"10A.+".Formeasurement


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POPERATION

milliamperes(one-halfampere),connectthetest

terminals,turntheknobtoD.C.,and turnthe

edmilliampererange.ReadtheD.C.scale,mul-

ythe properfactor.Itisrecommendedthatthese

easurementarenotused,however,unlessacheck

ampererangeindicatesthatthecurrentislessthan

,turntheA.C./D.C.knobtoitsD.C.

eadstothe POSandNEGterminals,andturnthe

edposition.Threepositionsare provided:

The1,100,and1000are thefactorsbywhich

heohmsscalehas tobemultipliedtoobtain

e.Eachtimebeforemeasuringtheresistanceofa

testrodsfirmlytogetherandadjustthe ZERO

erindicateszeroat theextremerightendofthe

n

aultylampoperation,withcrossreferencesto

relistedinthe followingtable:

otstrikeor feed,

aftturning.

aftnotturning.

otretractafterautomaticstrike,

aftturning.

aftnotturning.

tstoofar,breakingthearc.

backandforth.

trotatewhenpositivehead

yandgivesoffsoot.

rethan150amperes,

sthan150 amperes,

o great.

(Seealso"g"and"h"above)

hanJ -inch(judgedthrough


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HTANDCONTROLSTATION

malarc

ceof

thatofthesolid carbonshell,thegasvaporex-

edbythe shell.Inorderto maintainacraterwall

tivecarboniscontinuouslyrotated.Theball of

aterisfurther confinedbythestreamofhigh-

nsdirectedagainstitfromthetipof thenegative

otographofthe normalhigh-intensityarc,

chofthecrosssectionofthearc. Itwillbenoted

duetothe angleatwhichitis directedtowardthe

)capstheball ofgas,andalso(2) causesgas

heso-called"tail flame."

fthegases inthecraterwillincreasewiththe

hecrater,the greatestintrinsicbrilliancywill

craterwherethedepthisgreatest.In thesame

amcandlepowerofthesearchlightistobefound

.Thebeamcandlepowerisdependentuponthe

riesas theratioofthe areaofthereflectortothe

ositivecarbon.

ectorDiameter

centgasballmaybe consideredasradiating

eraysthatstrike themirrorarereflectedfromit

chlight.Thisbeamismadeupof thesolidangleof

essubtendedbythemirror.Thebeamis,there-


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1

1

8

nSubsystem77

ems84

tem66

tion72

t71

ation73

ht71

stem73

tor74

em86


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Tm 5-7045 SEARCHLIGHT, 60-INCH MODEL 1942 AND CONTROL STATION

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Transcript of Tm 5-7045 SEARCHLIGHT, 60-INCH MODEL 1942 AND CONTROL STATION