Samson 4740 Service manual

Mounting and
Operating Instructions
EB 8357 EN
Edition January 2015
Type4740 Electric Limit Switch

Denition of signal words
DANGER!
Hazardous situations which, if not
avoided, will result in death or seri-
ous injury
WARNING!
Hazardous situations which, if not
avoided, could result in death or seri-
ous injury
NOTICE
Property damage message or mal-
function
Note:
Additional information
Tip:
Recommended action

2 EB 8357 EN

Contents
EB 8357 EN 3
1 General safety instructions.............................................................................5
2 Markings on the device .................................................................................6
2.1 Nameplate ....................................................................................................6
2.2 Article code...................................................................................................6
3 Design and principle of operation ..................................................................7
3.1 Versions ........................................................................................................7
3.2 Technical data ...............................................................................................8
3.3 Dimensions in mm..........................................................................................9
4 Mounting and start-up.................................................................................10
4.1 MountingonType3353andType3354Valves..............................................10
4.1.1 Preparing the mounting kit............................................................................10
4.1.2 Mountingonthecontrolvalve .......................................................................12
4.2 MountingonType3379PneumaticActuator..................................................14
4.2.1 Preparing the mounting kit............................................................................14
4.2.2 Mounting on actuator...................................................................................16
4.3 Installation...................................................................................................18
4.3.1 Electrical connection.....................................................................................18
4.3.2 Pneumatic connection...................................................................................19
5 Start-up ......................................................................................................20
5.1 Adjustingthelimitcontacts ...........................................................................20

EB 8357 EN 5
General safety instructions
1 General safety instructions
For your own safety, follow these instructions concerning the mounting, start up, and opera-
tion of the limit switch:
ÎThedeviceistobemounted,starteduporoperatedonlybytrainedandexperienced
personnel familiar with the product.
According to these mounting and operating instructions, trained personnel refers to indi-
vidualswhoareabletojudgetheworktheyareassignedtoandrecognizepossibledan-
gersduetotheirspecializedtraining,theirknowledgeandexperienceaswellastheir
knowledgeoftheapplicablestandards.
ÎAnyhazardsthatcouldbecausedinthevalvebytheprocessmediumandtheoperating
pressureorbymovingpartsaretobepreventedbytakingappropriateprecautions.
ÎIfinadmissiblemotionsorforcesareproducedinthepneumaticactuatorasaresultof
thesupplypressurelevel,itmustberestrictedusingasuitablesupplypressurereducing
station.
To avoid damage to any equipment, the following also applies:
ÎDonotoperatethedevicewiththebackofthedevice/ventopeningfacingupwards.
ÎDonotsealtheventopeningwhenthedeviceisinstalledonsite.
Vent opening
ÎProper shipping and storage are assumed.
Note:
Devices with a CE marking fulll the requirements of the Directive 2004/108/EC.
The Declaration of Conformity is available on request.


6 EB 8357 EN
Markings on the device
2 Markings on the device
2.1 Nameplate
SAMSON 4740 Limit Switch
Model 4740-
Var-ID Serial no.
SAMSON AG D-60314 Frankfurt
12
3
45
Made in Germany
1Markingtoindicatewithout/withsolenoidvalve
2Markingtoindicateinductive/mechanicalproximityswitch
3 Article code
4CongurationID
5Serial no.
2.2 Article code
Limit switch Type4740- 0 0 0 x x x x 0 0 x x
Type
InductiveproximitysensorNCB2-V3-NO 1
MechanicalmicroswitchXGG12-88-S20 5
Switching element
With two switching elements (standard) 2
Solenoidvalve
Without 0
24VDC 1
Pneumatic connection
Without 0
Push-inL-connectorQS-G
1
/
8
-6 1
ISO228/1-G
1
/
8
2
Specialversion
Without 0 0

EB 8357 EN 7
Design and principle of operation
3 Design and principle of oper-
ation
TheType4740LimitSwitchcanbemounted
ontothefollowingdevices:
−Type3353AngleSeatValve(seeFig.1)
−Type3354GlobeValve
−Type 3379 Pneumatic Actuator
Theinductiveproximityswitchesormicros-
witchescausesignalstobesenttoacontrol
oralarmsystemwhenthetravelexceedsor
fallsbelowtheadjustedlimit.
Thelimitswitchcanoptionallybettedwith
a3/2-waysolenoidvalve.Whentheinte-
gratedsolenoidvalveisenergized,supply
air is applied to the actuator. When the so-
lenoidvalveisde-energized,theactuatoris
ventedandthecontrolvalvemovestoitsfail-
safe position.
The switching points of the limit contacts can
bechangedwithinthetravelrangeafterin-
stallation.Seesection5.1onpage20.
3.1 Versions
TwoversionsoftheType4740LimitSwitch
areavailable:
−Withinductiveproximityswitches
−With microswitches
Fig. 1: Type4740 Limit Switch with optional
solenoid valve on a Type3353 Angle
Seat Valve

8 EB 8357 EN
Markings on the device
3.2 Technical data
Electric limit switch Type4740
Travelrange 0to15mm
Ambienttemperaturerange –20to+65°C
Degree of protection IP65
Version with inductive proximity switches
Nominalvoltage 8.2VDCoverisolatingswitchamplieraccordingtoEN60947-
5-6
Version with microswitches
Switching capacity 250VAC,16(6)A
Option: 3/2-way solenoid valve
Nominalvoltage 24VDC
Power 1.5W
Flow rate 55ln/min(KV=0.035)
Maximumoperatingpressure 7bar
Pneumatic connection Push-inL-connectorQS-G
1
/
8
-6orISO228/1-G
1
/
8
Materials
Housing Polyamide
Cover Polycarbonate
Filter Polyethylene
Mounting kit Stainless steel
Weight
Limit switch (including solenoid
valve) Approx.550g
Mounting kit Approx.180g

EB 8357 EN 9
Markings on the device
3.3 Dimensions in mm
121
Ø94 22
M20 x 1.5

10 EB 8357 EN
Mounting and start-up
4 Mounting and start-up
4.1 Mounting on Type3353
and Type3354 Valves
Note:
The mounting unit (1400-9922) is re-
quired to mount the limit switch onto
the Type3353 Angle Seat Valve and
the Type3354 Globe Valve.
4.1.1 Preparing the mounting
kit
ÎSee Fig. 2
WARNING!
Risk of cut injury due to sharp
thread.
Do not touch the sharp thread of the
adapter.
Note:
The spacer (4) is only required to
mount the limit switch onto a fail-
close (FA/NC) valve.
Limit switch with inductive proximity switch-
es
ÎThreadtheguidedbushing(2)withthe
beveledpart(2.1)facingdownwardon-
to the stem of the adapter (3.1), while
holding the screw inside the adapter sta-
tionary.
Limit switch with microswitches
ÎThreadtheguidedbushing(2)withthe
straight rim (2.2) facing downward onto
the stem of the adapter (3.1), while hold-
ing the screw inside the adapter station-
ary.
Fail-open (FE/NO) version
ÎThe spacer is not required.
Fail-open (FA/NC) version
ÎInsertthespacer(4)intothesleeveofthe
adapter (3.2) as far as it will go.



EB 8357 EN 11
Mounting and start-up
Mounting kit for limit switch with
inductive proximity switches
Mounting kit for limit switch with
microswitches
2Threadedbushing
2.1 Beveledpart
2.2 Straight rim
3 Adapter
3.1 Stem
3.2 Sleeve
4 Spacer
2
3.1
3
3.2
4
2.1
2
2.2
2.1
2.2
2.2
2.1
Fig. 2: Mounting kit (1400-9922)

12 EB 8357 EN
Mounting and start-up
4.1.2 Mounting on the control
valve
ÎSee Fig. 3
WARNING!
Risk of personal injury due to pre-
loaded springs in the adapter.
Keep hold of the adapter when
screwing or unscrewing it and secure
it against sudden unintentional
release.
Fail-open (FE/NO) version
1. Use an open-end wrench (width across
ats32)orapairofplierstoremovethe
transparentcover(5.1)fromtheactuator
(5).
2. Use a socket wrench (width across
ats11)tounscrewthecap(5.2)from
the actuator stem.
3. Threadtheready-assembledadapter
(seesection4.1.1)fromthetopintothe
actuator(5).
ÎMake sure that the adapter does not
springbackasaresultofthespring
compression.
4. Carefully place the limit switch (1) on the
ready-assembledadapter.
ÎFortheversionwithmicroswitches,make
surethattheswitches(1.5)inthelimit
switch do not get damaged.
5. Lock the limit switch in the required posi-
tion using the retaining screw (1.4).
Fail-close (FA/NC)
1. Extendtheactuatorstem(applyairtothe
actuator).
2. Use an open-end wrench (width across
ats32)orapairofplierstoremovethe
transparentcover(5.1)fromtheactuator
(5).
3. Use a socket wrench (width across
ats11)tounscrewthecap(5.2)from
the actuator stem.
4. Retracttheactuatorstem(venttheactua-
tor).
5. Threadtheready-assembledadapter
(seesection4.1.1)fromthetopintothe
actuator(5).
ÎMake sure that the adapter does not
springbackasaresultofthespring
compression.
6. Carefully place the limit switch (1) on the
ready-assembledadapter.
ÎFortheversionwithmicroswitches,make
surethattheswitches(1.5)inthelimit
switch do not get damaged.
7. Lock the limit switch in the required posi-
tion using the retaining screw (1.4).

EB 8357 EN 13
Mounting and start-up
1
2
3
5
1.4
1 Limit switch
1.4 Retaining screw
1.5 Switch
2Threadedbushing
3 Adapter
5Actuator
5.1 Transparentcover
5.2 Cap
5.1
5.2
5
1.5
Fig. 3: Mounting the limit switch on the control valve

14 EB 8357 EN
Mounting and start-up
4.2 Mounting on Type3379
Pneumatic Actuator
Note:
The mounting kit (1402-1067) is re-
quired to mount the limit switch onto
the Type3379 Pneumatic Actuator.
4.2.1 Preparing the mounting
kit
ÎSee Fig. 4
WARNING!
Risk of cut injury due to sharp
thread.
Do not touch the sharp thread of the
adapter.
Limit switch with inductive proximity switch-
es
ÎThreadtheguidedbushing(2)withthe
beveledpart(2.1)facingdownwardon-
to the stem of the adapter (3.1), while
holding the screw inside the adapter sta-
tionary.
Limit switch with microswitches
ÎThreadtheguidedbushing(2)withthe
straight rim (2.2) facing downward onto
the stem of the adapter (3.1), while hold-
ing the screw inside the adapter station-
ary.


EB 8357 EN 15
Mounting and start-up
Mounting kit for limit switch with
inductive proximity switches
Mounting kit for limit switch with
microswitches
2Threadedbushing
2.1 Beveledpart
2.2 Straight rim
3 Adapter
3.1 Stem
2.1
2.2
2.2
2.1
2.1
2
2.2
2
3.1
3
Fig. 4: Mounting kit (1402-1067)

16 EB 8357 EN
Mounting and start-up
4.2.2 Mounting on actuator
ÎSeeFig.5
1. Use an open-end wrench (width across
ats32)orapairofplierstoremovethe
transparentcover(5.1)fromtheactuator
(5).
2. Pullthecap(5.2)offtheactuatorstem.
3. Threadtheready-assembledadapter
(seesection4.2.1)fromthetopintothe
actuator(5).
4. Carefully place the limit switch (1) on the
ready-assembledadapter.
ÎFortheversionwithmicroswitches,make
surethattheswitches(1.5)inthelimit
switch do not get damaged.
5. Lock the limit switch in the required posi-
tion using the retaining screw (1.4).

EB 8357 EN 17
Mounting and start-up
5.1
5.2
5
1.5
1 Limit switch
1.4 Retaining screw
1.5 Switch
2Threadedbushing
3 Adapter
5Actuator
5.1 Transparentcover
5.2 Cap
1
2
3
5
1.4
Fig. 5: Mounting the limit switch onto Type3379 Actuator

18 EB 8357 EN
Mounting and start-up
4.3 Installation
4.3.1 Electrical connection
DANGER!
Risk of electric shock!
For electrical installation, observe the
relevant electrotechnical regulations
and the accident prevention regula-
tions that apply in the country of use.
In Germany, these are the VDE regu-
lations and the accident prevention
regulations of the employers’ liability
insurance.
1. Unscrewthefourscrewsonhousingcov-
erandtakethecoverofftheactuator.
2. Routewiresthroughthecableglandto
the terminals as shown in Fig. 6.
3. Placeonthehousingcoverandfastenit.
+–
81 82
+–
51 52
+–
41 42
Proximityswitches Solenoidvalve
(option)
Version with inductive
proximity switches
+–
81 8252 5343 5141 42
Microswitches Solenoidvalve
(option)
Version with microswitches
Fig. 6: Electrical connection

EB 8357 EN 19
Mounting and start-up
4.3.2 Pneumatic connection
NOTICE
Risk of malfunction due to failure to
comply with required air quality.
−Only use supply air that is dry and
free of oil and dust.
−Read the maintenance instructions
for upstream pressure reducing sta-
tions.
−Blow through all air pipes and hos-
es thoroughly before connecting
them.
Twopneumaticconnectionsexistonthelimit
switchversionwithsolenoidvalve(seeFig.
7).
The following assignment apply to the con-
nections:
−Connection 1: Supply
−Connection 2: Output
Thescrewttingsaredesignedas:
−Push-inL-connectorQS-G
1
/
8
-6 or
−ISO228/1-G
1
/
8.
ÎSeearticlecodeonpage6
Note:
The pneumatic connections in the ver-
sion without solenoid valve are
sealed with stoppers.
Connection 1
Connection 2
Fig. 7: Pneumatic connection in this case with
push-in L-connector QS-G
1
/
8
-6


20 EB 8357 EN
Start-up
5 Start-up
5.1 Adjusting the limit contacts
The switching point of the limit contacts can
bechangedwithinthetravelrangeafterin-
stallation.
Toadjusttheswitchingpoint,proceedasfol-
lows:
1. Unscrewthefourscrewsonhousingcov-
erofthelimitswitchandtakethecover
off the actuator.
2. Loosen the two screws (1.1) of the limit
contact(1.3)tobeadjustedsothatthe
limitcontact(1.3)canmoveontherail
(1.4).
3. Adjusttheswitchingpointwiththescrew
(1.2):
ÎTurnthescrewclockwisetomovethelim-
it contact towards the top end position.
ÎTurnthescrewcounterclockwisetomove
thelimitcontacttowardsthebottomend
position.
4. Lock the limit contact (1.3) in position
with the screws (1.1).
5. Replacethehousingcoverofthelimit
switch and fasten down with the four
screws.
1.2
1.4
1.1
1.3
1.2
1.4
1.1
1.3
Version with inductive
proximity switches
Version with microswitches
1.1 Fastening screws
1.2 Adjustmentscrew
1.3 Limit contact
1.4 Rail
1.5 Switch
Fig. 8: Adjusting the limit contacts