4
GB
3.3. Technical specifications
Installation
:directlyonidlestrand.
Electricaloutput
:cablegland.
Repeatability
: 1 % FS.
Lengthofcord
:2meters.
MeasurementSensor
:2integratedmicroswitches.
Calibrationsystem
:byscrews.
Hysteresis
:200daNonstrand.
Contact1:1NO,1NC.
Operatingtemperature
:-30°to+80°C.
Contact2:1NO,1NC.
Protectiondegree
: I.P 63.
Category
1(asENISO13849-1)
Cut-outvoltage
:230VACmax.
Material
:aerospacequality
aluminium.
Cut-outintensity
2Amax/inductiveload
4A.max./resistveload
Connection
:electricalcable,7conductors.
Surfacetreatment
:anodizing.
Maintenance
: none.
TechnicalDataoftheMicroswitches:
– Type:V4NST7-UL
– According:UL,CSA,ENEC
– mechanicallife:5x10
6
cyclesminimum(impactfreeactuation)
Maximumelectricalratings:
Recommended Maximum Electrical Ratings
Voltage(max)
Load(A)
Inductiveload(A)
Approval
V4NT7/V4NST7-UL
250VAC
5(0.75pf)
UL1054/CSA22.2No.55-6.000operations-65°C
250VAC
5
2
EN61058-1,T85,10.000operations
0-15VDC
5
3
Generalrating-50.000operations(85°C)
15-30VDC
5
3
Generalrating-50.000operations(85°C)
Safety considerations:
This device can be set for 2 overload trigger points which can be set separately. For a safety function each of them
is a single channel considered as a «well tried component» by Tractel
®
.
Achieving a PL required for a safety function:
For a safety device with single channel, PL level is
determinedbyMTTFD(meantimebetweendangerous
failure)emaningfromB
10D
monitoring.
B
10D
:
According the technical datas of the switch, the
life duration is determined by maximum switching
operations.Tractel
®
considersB
10D
is10.000operations
forswitchinginductiveloadof2A(eg:contactorcoil).
MTTF
D
:
MTTF
D
mustbeevaluatedbytheintegratorusingthe
formulasanddiagramsofthestandardENISO13849-1
consideringtheB
10D
andcategorymentionedabove.
where
with
d
op
=theaveragenumberofhoursofuseperday
h
op
=theaveragenumberofdaysofuseperyear
t
cycle
=istheaveragetimeofusebetweenthestartof
twosuccessivecyclesofthecomponentHF31in
thiscase.
d
op
, h
op
and t
cycle
havetobedefinedbytheinstallation
user.
Then,theMTTF
D
couldbeclassifiedinarange:Low,
medium or high as proposed by EN ISO 13849-1 in
table4:
MTTF
D
Denotation of each
channel
Range of each
channel
Low
3years≤MTTF
D
< 10 years
Medium
10years≤MTTF
D
< 30 years
High
30years≤MTTF
D
≤100years
Achieved PL:
Afterthat,achivedPLisissuedoutbyadiagram(figure
5inENISO13849-1)takinginconsiderationcategory,
DC monitoring capability and MTTF
D
. Without failure
detection DCfactoris‘none’(nodiagnostic coverage
possibility).
