7551-7552
7551-7552
Position limit switch
5
Features
OPtiOns
•Designedtoguaranteeexcellentperformanceinthemost
challengingoperatingconditions.
•Rodswith4maintainedpositionsevery90°.
•4ixingholes.
•PositiveopeningNCcontactsforsafetyfunctions.
•Mechanicallifeofswitches:1millionoperations.
•Operationfrequency:3600operations/hourmax.
•IPprotectiondegree:7551-7552areclassiiedIP66with
speciiccableclampM20.
•Extremetemperatureresistance:-40°Cto+70°C.
•Itfeaturesdie-castaluminumalloyenclosure,withbushings
madeofsinterizedmaterialandheadmadeofzamatoresist
anyviolentimpact,chemicalaggressionandrustandreduce
theneedforroutinemaintenanceoperationonthehead.
•Allmaterialsandcomponentsusedarewearresistantand
guaranteeprotectionoftheunitagainstwateranddust.
•4snapactionswitcheswith1NO+1NCchange-overcontacts
orslowactionswitcheswith1NCcontact.
•3outputsforcableclampstoreduceinstallationtimeand
makewiringeasier.
Thedataandtheproductsillustratedinthisbrochuremaybemodiiedwithoutnotice.Underno
circumstancescantheirdescriptionhaveacontractualvalue.
Crosspositionlimitswitchesdesignedforcontrolling
themovementofoverheadtravellingcranes,hoistsand
complexmachinetools.
Thechoiceofmaterialsandtechnicalsolutionsadopted
enableuseinharshoperatingconditions.
CertiFiCatiOns
•CEmarkingandEACcertiication.
1
7551-7552
CertiFiCatiOns
Conformity to Community Directives
2006/95/CE Low Voltage Directive
2006/42/CE Machinery Directive
EN 60204-1 Safety of machinery - Electrical equipment of machines
EN 60947-1 Low-voltage switchgear and controlgear
5
Conformity to CE Standards
EN 60947-5-1 Low-voltage switchgear and controlgear - Control circuit devices and switching
elements - Electromechanical control circuit devices
EN 60529 Degrees of protection provided by enclosures
Markings and homologations
C
General teChniCal sPeCiFiCatiOns
Ambient temperature
Storage -40°C/+70°C
Operational -40°C/+70°C
IP protection degree
IP66 max. with dedicated cable clamp M20
Insulation category
Class I
Operation frequency
3600 operations/hour max
Cable entry
Cable clamp M20
teChniCal sPeCiFiCatiOns OF the miCrOswitChes
Code
PRSL0036XX
PRSL0037XX
AC 15
Utilisation category
Rated operational current
3A
Rated operational voltage
250 Vac
10 A
Rated thermal current
300 Vac
Rated insulation voltage
1x106 operations
Mechanical life
Screw-type terminals
Connections
Wires
1x2.5 mm2, 2x1.5 mm2
(UL - (c)UL: use 60°C or 75°C copper (CU) conductor and wire 16-18 AWG)
0.8 Nm
Tightening torque
Microswitch type
Contacts
Double break, snap action
Double break, slow action
1NO+1NC
(All NC contacts are of the positive opening
)
operation type
1NC
(All NC contacts are of the positive opening
operation type
)
13 21
11
14 22
12
Scheme
Markings and homologations
2
C X
7551-7552
maximum aCtuatinG dimensiOns
rods with 4 maintained positions
•Pre-travelangleforrotationcontactoperation:49°
•Maximumrotationangleforeachmaintainedposition:90°
•Averageangleforthemechanicaltripping:48°
•Maintainedpositionseach:90°
5
Inordertoensureproperoperations,thedimensionsshallnotbeincreased;anyhow,theycanbedecreased,takingintoaccount
thattheclosertheimpactpointistothecenterofthehead,thehighertheimpactandthemechanicalwearofrodandshaftare.
IMPORTANT:themaximumimpactspeedis1.35m/s,referingtotheidealimpactpointsshowedinthedrawing.
100 mm rod
Actuating point 60 mm
125 mm rod
Actuating point 70 mm
150 mm rod
Actuating point 93 mm
30°
200 mm
250 mm
300 mm
Rod length
Overall dimensiOns (mm)
200
6
6
100
82
90°
45
126
9
94
125
143
9
200
5.5
4.5
69
75
90
95
3
7551-7552
exPlOded drawinG
35
10
5
11
12
7
6
13
5
4
14
15
16
17
18
3
19
8
9
20
2
1
35
21
22
23
24
25
26
27
28
29
31
32
1
33
34
4
30
7551-7552
limit switChes
13 21
Thelimitswitchesareequippedwith1NO+1NCsnapactionswitchesPRSL0036XX
No. of switches
PRSL0036XX
Actuating travel
.
14 22
Rod length
Code
4
200 mm
PF26755100
4
200 mm
PF26755200
5
5
7551-7552
assemBlY drawinG
5
a3
a3
a2
a2
a1
6
7551-7552
COmPOnents
switches
Ref.
Drawing
Description
Scheme
Code
13 21
1NO+1NC snap action switch
5
PRSL0036XX
14 22
A1
11
1NC slow action switch
PRSL0037XX
12
accessories
Ref.
Drawing
Description
Code
Head for 7551
PF267551TE
Head for 7552
PF267552TE
Rod 6x6x200 mm
PRTO3006PE
A2
A3
7
7551-7552
use and maintenanCe instruCtiOns
5
The 7551 and 7552 limit switches are electromechanical devices
for low voltage control circuits (EN 60947-1, EN 60947-5-1)
for use as electric equipment on machines (EN 60204-1) in
compliance with the essential requisites of the Low Voltage
Directive 2006/95/CE and the Machine Directive 2006/42/CE.
-Makesurethewiresarenottaut,twistedand/orforcedinto
excessivecurvatures.
-Theinstallationwillbecompleteaftercheckingonceortwice
thatthemachineisproperlyslowedand/orstoppedbythe
limitswitchinstalled.
Thelimitswitchisdesignedforuseinindustrialenvironments
withevenverysevereclimaticconditions(working
temperaturesfrom-40°Cto+70°Candissuitableforuse
intropicalenvironments).Theequipmentisnotsuitablefor
useinenvironmentswithapotentiallyexplosiveatmosphere,
inthepresenceofcorrosiveagentsorhighpercentageof
sodiumchloride(salinemist).Contactwithoil,acidsand
solventsmaydamagetheequipment;avoidusingthem
forcleaning.Thelimitswitchisnotsuitableforusein
environmentswithapotentiallyexplosiveatmosphere.
Periodic maintenance steps
-Makesurethelimitswitchissecurelyfastenedinplaceand
thefastenersaretightenedproperly.
-Makesuretherearenoiniltrationsofwaterthroughthewire
clamp(s)andthattherubbersleeveisintactandflexible.
-Openthelid(34)andcheckthatthegasket(33)isintactand
flatinitshousing.
-Checkthattheswitches(30)areproperlywiredandthe
terminalssecurelyfastened;testtheon/offmechanismby
hand.Makesuretheheadturnswithoutforcing,thatitis
cleanandmoveswithoutuncertaintybetweenoneposition
andthenext;makesurethescrews(1)ontheheadare
properlytightened.Ifthereisanydificultyinswitchingand
positioningthehead,replacethelimitswitch.
-Checktheconditionsoftherods(3)andmakesuretheyare
positionedcorrectly:iftherodsarenotperfectlystraightthey
shouldbereplacedandrepositionedcarefullyinaccordance
withthespeciications.
Mechanicaltestforworkingstobecarriedoutwithactivated
microswitches.
steps for the proper installation of the limit switch
-First,positionthelimitswitchsothatthemachineorone
armofitstrikestherodinthepositionsindicatedinthe
maximumdrivemeasurements.
-Markthefasteningholesonthesupportingwallanddrillthe
holes.
-Afterfastening,makesuretherodisperfectlyvertical,that
therods(3)*aresecurelyfastenedinthehead(4)andthatthe
pointsofimpactareasveriiedpreviously.
-Proceedwithelectricwiringtakingcaretotightenthe
terminalsontheswitches(30),aftermanuallycheckingthe
on/offfunction.
-Tightentheterminalscrewswithatorqueof0.8Nm
(insertabilityofwiresintotheterminals1x2,5mm2-
2x1,5mm2)(UL-(c)UL:use60or75°Cconductorandwiresize
No.16-18AWG,strandedorsolid).
-Closethelid(34)takingcaretopositionthegasket(33)inits
housing.
-Tightenthewireclamptakingcaretoseethattherubber
insideadherestothesheathingonthewire.
8
CAUTION:FOLLOWTHEINSTRUCTIONSCAREFULLYWITH
REGARDTOTHESPEEDANDPOSITIONOFTHERODS
INDICATEDINTHEMAXIMUMDRIVEMEASUREMENTS.
FAILURETOFOLLOWTHESPECIFICATIONSINDICATEDMAY
JEOPARDIZETHEFUNCTIONANDSAFETYOFTHESYSTEM.
Anychangetopartsofthelimitswitchwillinvalidatethe
ratingplatedataandidentiicationofthedevice,andrender
thewarrantynullandvoid.Incaseofreplacementofanypart,
useonlyoriginalreplacements.
TERisnotliablefordamagescausedbyimproperuseofthe
deviceandinstallationwhichisnotmadecorrectly.
*Pleaserefertotheexplodeddrawinginthecatalogue.