Samson 3738-20 Service manual

Mounting and
Operating Instructions
EB 8390 EN
Firmware version 1.20
Edition June 2015
Type3738-20 Electronic Limit Switch
with optional integrated solenoid valve
for on/off valves

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 8390 EN

Contents
EB 8390 EN 3
1 Important safety instructions ..........................................................................7
2 Article code...................................................................................................8
3 Design and principle of operation ..................................................................9
3.1 Versions......................................................................................................12
3.2 Communication ...........................................................................................13
3.3 Safety-related information ............................................................................13
4 Technical data .............................................................................................15
4.1 Electronic limit switch ...................................................................................15
4.2 Solenoid valve.............................................................................................19
5 Attachment .................................................................................................20
5.1 Attachment to linear actuators.......................................................................21
5.1.1 Preparations................................................................................................21
5.1.2 Attachment..................................................................................................22
5.2 Attachment to rotary actuators ......................................................................24
5.2.1 Preparations................................................................................................26
5.2.2 Attachment..................................................................................................26
5.3 Accessories .................................................................................................30
6 Connections ................................................................................................31
6.1 Pneumatic connections..................................................................................31
6.2 Supply pressure ...........................................................................................32
6.3 Electrical connection.....................................................................................32
7 Operating controls and readings..................................................................36
7.1 Rotary pushbutton........................................................................................36
7.2 SAMSON SSP interface................................................................................36
7.3 Operating structure......................................................................................37
8 Start-up ......................................................................................................41
8.1 Adapting the display direction ......................................................................41
8.2 Verifying readings on display........................................................................42
8.3 Determining the actuator type .......................................................................43
8.4 Determining the direction of action................................................................43
8.5 Determining the switching function of contacts................................................43

4 EB 8390 EN
Contents
8.6 Adjusting the limit switches ...........................................................................44
8.7 Initialization ................................................................................................44
8.7.1 Start automatic initialization .........................................................................45
8.7.2 Start manual initialization.............................................................................46
8.8 Replacing an electronic limit switch................................................................47
8.9 Zero/end position calibration .......................................................................48
8.10 Reset to default settings.................................................................................48
9 Operation...................................................................................................49
9.1 Lock operation.............................................................................................49
9.2 Partial stroke test (PST)..................................................................................49
9.2.1 DeningthePSTtargetrange........................................................................51
9.2.2 Starting the partial stroke test........................................................................52
9.2.3 Example: PTO direction of action...................................................................53
9.3 Testing the contacts.......................................................................................55
9.4 Testing the solenoid valve..............................................................................56
9.5 Faults..........................................................................................................57
9.5.1 Status messages...........................................................................................57
9.5.2 Error messages............................................................................................57
9.5.3 Conrmingstatusanderrormessages ...........................................................58
10 Maintenance, calibration and work on equipment ........................................58
10.1 Maintenance ...............................................................................................58
11 Servicing explosion-protected devices ..........................................................58
12 Firmware update (serial interface)................................................................59
13 Parameter list..............................................................................................60
13.1 Status messages...........................................................................................64
13.2 Error messages............................................................................................67
14 Dimensions in mm.......................................................................................69
14.1 FixinglevelsaccordingtoVDI/VDE3845(September2010) ..........................70
Assignment based on the direction of action.................................................83

EB 8390 EN 5
Firmware revisions
Firmware Revisions
1.12 Changes to parameters and error messages (see section13)
• Parameters renumbered due to parameters being added or removed.
Removed parameters:
– 'PST initialization' (the partial stroke test no longer needs to be initialized).
– Info: Rotary motions
New parameters:
–'Actuatortype'(rotaryorlinearactuator).Seesection8.3.
–'Switchingfunctionofcontacts'(NOorNCcontact).Seesection8.5.
• Error messages renumbered due to error messages being removed.
Removed error messages:
– 'PST target range not reached'
– 'PST target range exceeded'
• The new parameter 'Actuator type' as well as the 'Actuator's direction of action' pa-
rameter are locked after the electronic limit switch has been initialized. See sec-
tions8.3and8.4.
• The actuator transit time monitoring (F4) depends on the value adjusted in 'Status
readoutforactuatortransittime(P13).Thisisadjustablebetween0(OFF)and1800s.
• The dead time is already included in the information parameters 'Actuator transit time
when the solenoid valve is de-energized' and 'Actuator transit time when the solenoid
valve is energized'.
• Themonitoringoftherotarymotioncountercanbedeactivatedbyconguring'Maxi-
mum rotary motions' (P26) = OFF.
Changes to the partial stroke test (PST) (see section9.2)
• The minimum pulse length at contact C is three seconds during partial stroke testing.
• The PST target range is made up of 'PST step end (P14) ± ½ 'PST tolerance band'
(P15).
• Once a partial stroke test has been completed, the assessment of the transit times when
the solenoid valve is de-energized and energized ('PST transit time when the solenoid
valve is de-energized' and 'PST transit time when the solenoid valve is energized').
Only the duration of the entire test is shown in version 1.01.
• In the TROVIS-VIEW software, a diagram plotting the valve position against time while
the solenoid valve is de-energized and energized is shown (256 measuring points).
The data can be read out by connecting the device at the SSP interface to a computer.

6 EB 8390 EN
Firmware revisions
Firmware Revisions
1.20 Changes to parameter readings on the display
• P3VerifyLCDsegments:TSTDreading(seesection8.2)
• P9Automaticinitialization:INIAreading(seesection8.7)
• P10Manualinitialization:INIMreading(seesection8.7)
• P11Endpositioncalibration:REFreading(seesection8.9)
• P17StartmanualPST:PSTreading(seesection9.2)
• P19Testingcontacts:TSTCreading(seesection9.3)
• P20Testingsolenoidvalve:TSTSreading(seesection9.4)
• P21Reset:RSTreading(seesection8.10)
New status message F15
ThisstatusmessageisgeneratedwhenthecongurationmodeSETisactivated.
Changes to the partial stroke test (PST) (see section9.2)
A canceled partial stroke test (PST) is logged with a time stamp in TROVIS-VIEW.

EB 8390 EN 7
Important safety instructions
1 Important safety instructions
For your own safety, follow these instructions concerning the mounting, start up and opera-
tion of the electronic limit switch:
−The 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 instruc-
tions, trained personnel is referred to as individuals who are able to judge the work they
are assigned to and recognize possible dangers due to their specialized training, their
knowledge and experience as well as their knowledge of the applicable standards.
−Explosion-protected versions of this device are to be operated only by personnel who has
undergone special training or instructions or who is authorized to work on explosion-pro-
tected devices in hazardous areas.
−Any hazards that could be caused by moving parts are to be prevented by taking appro-
priate precautions.
−Forusewithinhazardousareas,theSpecialConditionsmentionedintheECtypeexam-
inationcerticateanditsaddendamustbeobserved.
−If 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:
−Proper shipping and storage are assumed.
−Do not ground electric welding equipment near to the electronic limit switch.
Note:
The device with a CE marking fullls the requirements of the Directive 2004/108/EC.


8 EB 8390 EN
Article code
2 Article code
Electronic Limit Switch Type 3738-20- x x x 1 x 0 0 x x x x 0 x
With LCD
Explosion protection
Without 0 0 0
ATEX:II2GExiaIICT6;II2DExIIICT80°CIP66 110
ATEX:II2GExeb[ia]IICT4;II2DExtbIIICT80°CIP66 3 1 0 0
GOST:1ExiaIICT6/T5/T4GaX;ExtbIIICT80°CDbX 113
GOST:1Exe[ia]IICT4GbX;ExtbIIICT80°CDbX 313
Solenoid valve
External 0
Integrated 4
Company version
SAMSON 0
AIR TORQUE 1
Housing
Standard aluminum, black structured, RAL 9005 1
Cover
Gray beige 0
Black 1
Silver gray 3
Safetyapproval(seesection3.3)
TÜV/IEC61508 2
Special applications
Without 0

EB 8390 EN 9
Design and principle of operation
3 Design and principle of oper-
ation
The Type 3738-20 Electronic Limit Switch
can replace conventional solenoid valves
and limit switches used for the automation of
on/off valves without the need to change the
wiring or signal level. Major features of the
electronic limit switch include:
−Unicationofthefunctionsfeaturedinlim-
it switches and a solenoid valve in one
housing
−Power supplied in a two-wire system from
the connection of contact A, without the
need for an additional power supply
−Non-contact sensing of the rotation angle
by a magnetoresistive sensor system
−Integrated diagnostics with partial stroke
testing (PST)
−Suitable for use in safety-instrumented sys-
tems up to SIL 2 (single device) and SIL 3
(redundantconguration).Seesection3.3.
Fig.1: Valve assembly with electronic limit
switch (version with integrated solenoid
valve)
Fig.2 and Fig.3
The electronic limit switch is designed for at-
tachment to linear and rotary actuators. The
travel is measured without contact using a
magnet (on a screw) positioned centrically
on the actuator shaft. The screw with magnet
does not need to be adjusted. The AMR
(anisotropic magnetoresistive) sensor located
in the device together with the measuring
electronics (1) can detect the directional
changeoftheappliedmagneticeldand,as
a result, sense the movement of the actuator.
The actuator is operated by a solenoid valve
(7) which converts the binary signal issued
issued by the electric control equipment (6)
into a binary pressure signal.
The electronic limit switch has four NAMUR
contacts: the limit switch for fail-safe position
(contact A, 13) and the limit switch for oper-
ating position (contact B, 14) issue a limit
signal when the valve reaches the corre-
sponding end position. Contact C (15) indi-
cates when a third limit is reached or the PST
target range of the partial stroke test has
been reached. The switching response of the
contacts can be adjusted within the travel
range. The fault alarm contact St (16) indi-
cates the generation of any status and error
messages.
An electronic limit switch version for an ex-
ternalsolenoidvalve(Fig.2)isavailablefor
higher air capacities required by large actu-
ators. The principle of operation is the same.

10 EB 8390 EN
Article code
SSP
interface
10 9
3
12
B
A
13
C
15
St
2
4
6
11 7
81
51
6
14
Signal for solenoid
v
alve: V1 or V3
Power
Supply
Electronic limit switch
Actuator
1 AMR sensor with electronics
2 A/D converter
3 Microcontroller
4 Galvanic isolation
5 Galvanic isolation
6 Actuation of solenoid valve
7 Solenoid valve
8 Air capacity booster
9 Display
10 Rotary pushbutton (local operation)
11 LED for solenoid valve
12 Internal supply
13 NAMUR contact A (limit switch for fail-safe position)
14 NAMUR contact B (limit switch for operating position)
15 NAMUR contact C (signal on reaching target range during
partial stroke test)
16 NAMUR contact St (fault alarm contact)
Fig.2: Schematic diagram – Type 3738-20-xxx1400xxx000 Electronic Limit Switch with integrated
solenoid valve

EB 8390 EN 11
Article code
SSP
interface
10 9
3
12
B
A
13
C
15
St
2
4
6
11
71
51
6
14
Signal for solenoid
v
alve: V1
V2
Power
Supply
Electronic limit switch
Actuator
1 AMR sensor with electronics
2 A/D converter
3 Microcontroller
4 Galvanic isolation
5 Galvanic isolation
6 Actuation of solenoid valve
7 Solenoid valve
9 Display
10 Rotary pushbutton (local operation)
11 LED for solenoid valve
12 Internal supply
13 NAMUR contact A (limit switch for fail-safe position)
14 NAMUR contact B (limit switch for operating position)
15 NAMUR contact C (signal on reaching target range during
partial stroke test)
16 NAMUR contact St (fault alarm contact)
Fig.3: Schematic diagram – Type 3738-20-xxx1000xxxx00 Electronic Limit Switch with external
solenoid valve

12 EB 8390 EN
Design and principle of operation
NAMUR contacts A, B, C
ThecontactscanbeconguredaseitherNO
orNCcontacts.SeeFig.4andsection8.5.
NAMUR contact St
This contact is a NC contact.
3.1 Versions
Type3738-20-xxx1400xxx000 Electronic
Limit Switch with integrated solenoid valve
The electronic limit switch with integrated so-
lenoid valve form a compact unit together
with a pneumatic actuator, which is easy to
mount. The 3/2-way or 5/2-way function of
the solenoid valve is selected by changing
the position of a molded seal.
Based on VDI/VDE 3845, level 2, its version
canbemountedontoPfeifferType31bRota-
ry Actuators. The need for additional pneu-
matic connections is eliminated.
Type3738-20-xxx1000xxxx00 Electronic
Limit Switch for external solenoid valve
The electronic limit switch for an external so-
lenoid valve allows switching capacities up
tomax.18Wat24VDC,meaningall
common solenoid valves, even the Ex e ver-
sions, can be combined with the electronic
limit switch. This version is suitable for rotary
actuatorsaccordingtoVDI/VDE3845,lev-
el1.SeeFig.4.
Changes to the electronic limit switch's set-
tings do not effect the external solenoid
valve.
NC contact NO contact
No response Response
Response No response
Wire break Wire break
[mA] [mA]
2.1
1.2
0.05
2.1
1.2
0.05
Fig.4: NO and NC contacts

EB 8390 EN 13
Design and principle of operation
3.2 Communication
Theelectroniclimitswitchcanbecongured
withSAMSON'sTROVIS-VIEWCongura-
tion and Operator Interface.
The electronic limit switch has for this pur-
pose a SAMSON SSP interface to allow the
RS-232 or USB port of a computer to be
connected to it over a serial interface adapt-
er cable. The TROVIS-VIEW software en-
ablestheusertoeasilyconguretheelec-
tronic limit switch as well as view and docu-
ment process parameters on a computer.
SeeTable3forordernumbers.
Note:
TROVIS-VIEW provides a uniform us-
er interface that allows users to con-
gure and parameterize various
SAMSON devices using device-spe-
cic database modules. The
Type3738-20 device module can be
downloaded free of charge from our
website (www. samson.de) at Ser-
vices > Software > TROVIS-VIEW.
Further information on TROVIS-VIEW
(e.g. system requirements) is avail-
able on our website and in the Data
Sheet uT6661.
3.3 Safety-related information
The Type 3738-20 Electronic Limit Switch
was developed to meet the requirements stip-
ulatedinIEC61508.Thesafety-relateddata
are listed in the Manufacturer’s Declaration
HE1163.Theconformityofthedevelopment
process and the performed FMEDA as well
as the statements in the Manufacturer’s Dec-
larationHE1163arecertiedbyTÜV
Rheinland Industrie Service GmbH in the
Certicate968/EL485.01/09of2009-11-
09.
Type 3738-20-xxx1000xxxx00 in combi-
nation with an external solenoid valve
The forwarding of the switching voltage for
the external solenoid valve by the
Type3738-20-xxx1000xxxx00Electronic
Limit Switch has the same quality as wiring
and does not lead to a change in the safe-
ty-related data of the circuit.
Safety-related assumptions
Safety-related end position monitoring
AllswitchingcontactsoftheType3738-20
Electronic Limit Switch behave as stipulated
inDINEN60947-5-6andaresuitablefor
use in safety-instrumented systems up to
SIL2(singledevice)andSIL3(redundant
conguration)accordingtoTÜV/IEC61508.
The contacts can be used either as NC or
NO contacts. Their switching states are indi-
catedaccordingtoDINEN60947-5-6.
Contact A is assigned to the end position for
the fail-safe position (limit switch for fail-safe
position). The fail-safe position is the end po-
sition to which the single-acting actuator is
moved by the spring-return mechanism when
the solenoid valve is de-energized.
Emergency venting
When the optional integrated solenoid valve
is used, the electronic limit switch discharges
its pneumatic output to the atmosphere when
the solenoid valve is de-energized. This
causes the mounted actuator to be vented.


14 EB 8390 EN
Design and principle of operation
The function is suitable for use in safety-in-
strumented systems up to SIL 2 (single chan-
nel)andSIL3(redundantconguration)ac-
cordingtoIEC61508.
Note:
Safety-related end position monitor-
ing and emergency venting work in-
dependently from one another to
meet the device design requirements
to conform with SIL.
Requirements
−Short mean time to repair compared to
the average rate of demand
−Normal exposure to industrial environ-
mentanduids
−The user is responsible for ensuring that
the device is used as intended.
Useful lifetime
AccordingtoIEC61508-2,section7.4.9.5,
a useful lifetime of eight to twelve years can
be assumed. Other values can be used
based on the user’s previous experience (pri-
or use/proven-in-use).
Notes concerning diagnostics
−Diagnostics are performed cyclically in-
side the device. Critical errors (device er-
ror E9) are indicated by contact B as
wire breakage according to
DINEN60947-5-6.Existingerrorsmust
be remedied as described in these
Mounting and Operating Instructions. If
this is not possible, the electronic limit
switch must not be used in safety loops.
−The proper functioning of the display can
beveriedoverP3 parameter (see sec-
tion8.2).
−The correct setting of all parameters must
beveriedbeforeeverystart-up.
Proof testing
All switching contacts need to be activated
for the proof test. This can be done by:
−Using the mounted actuator to move the
valve to the end position
−Simulating the outputs using P19 param-
eter(seesection9.4).
During the proof test, check that the outputs
switch properly.
Intended use
Thespecicationsandinformationintheda-
ta sheet and in these instructions must be ob-
served.
Note concerning diagnosis of connected so-
lenoid valve and actuator
The diagnostics functions performed in the
device, e.g. actuator transit time monitoring,
are suitable for diagnosis of connected de-
vices, such as solenoid valve, pneumatic ac-
tuator and valve.
Repairs
Devices which are used in safety-instrument-
ed systems must be repaired by the manu-
facturer.


EB 8390 EN 15
Technical data
4 Technical data
4.1 Electronic limit switch
Electronic Limit Switch Type 3738-20-xxx1400xxx000 3738-20-xxx1000xxxx00
Version With integrated solenoid valve For external solenoid valve
Permissible range of rotation Min.:0to30°Max.:0to170°
Communica-
tion Local communication SAMSON SSP interface with serial interface adapter
Software TROVIS-VIEW with database module 3738-20
Supply air Supply pressure 2.4to8bar Sameasspecicationsofthe
solenoid valve manufacturer
Air quality AccordingtoISO8573-1
Max. particle size and density:
Class 4
Oil content: Class 3
Moisture and water: Class 3
Pressure dew point: at least
10Kbelowthelowestambient
temperature to be expected
Electric power supply PoweredovercontactAacc.toDINEN60947-5-6(e.g.
NAMURisolatingswitchamplier)
Permissible ambient temperature
The limits specied in the
examination certicate additionally
apply.
–25to80°C –40to80°C
The permissible operating temperature for use in safety-
instrumentedsystemsis–20to70°C
Metal cable glands must be used for ambient temperatures
below–20°C.
Inuences Temperature ±0.7%/90°angleabovethepermissibletemperaturerange
Effect of vibration ≤0.25%upto2500Hzand4gaccordingtoIEC770
Electromagnetic compatibility Complying with EN 61000-6-2, EN 61000-6-3, EN 61326-1
and NAMUR Recommendation NE 21
Electrical connections FourM20x1.5cableglandsfor6to12mmclampingrange,
screwterminalsfor0.2to2.5mm²wirecross-sections
Explosion protection SeeTable1
Degree of protection IP66

16 EB 8390 EN
Technical data
Electronic Limit Switch Type 3738-20-xxx1400xxx000 3738-20-xxx1000xxxx00
Version With integrated solenoid valve For external solenoid valve
Safety ap-
proval Safety-related end po- sition monitoring The limit switches are suitable for use in safety-instrumented systemsuptoSIL2(singlechannel)andSIL3(redundantcon-
guration)accordingtoIEC61508.Forfurtherdetails,see
section3.3.
Emergency venting See section 3.3 Sameasspecicationsofthe
solenoid valve manufacturer
Materials Housing Die-cast aluminum EN AC-AlSi12(Fe) (EN AC-44300) acc. to
DINEN1706,powderpaintcoated
Housing cover Computer
Cover gasket PU
Indicator wheel Computer
Magnet material Hard ferrite
Weight Approx.1.2kg Approx.1.0kg
Compliance ·
Switching function NC contact NO contact
Switching
contacts
No response/no fault ≥2.2mA ≤1.0mA
Response/fault
indication ≤1.0mA ≥2.2mA
Hysteresis 1%
Contacts Contact A
Limit switch for fail-safe
position (solenoid valve
de-energized)
PTO (power to open): responds when the valve moves through
the switching contact towards the lower end position (P7)
PTC (power to close): responds when the valve moves through
the switching contact towards the upper end position (P8)
Contact B
Limit switch for
operating position
(solenoid valve
energized)
PTO (power to open): responds when the valve moves through
the switching contact towards the upper end position (P8)
PTC (power to close): responds when the valve moves through
the switching contact towards the lower end position (P7)
SignalforwirebreakageaccordingtoDINEN60947-5-6
Contact C
Signal when target
range reached during
partial stroke test
Responds when the valve reaches the PST target range*
* PST target range =
'PST step end' (P14) ± ½ 'PST tolerance band' (P15)

EB 8390 EN 17
Technical data
Electronic Limit Switch Type 3738-20-xxx1400xxx000 3738-20-xxx1000xxxx00
Version With integrated solenoid valve For external solenoid valve
Contacts Contact C
Limit contact for inter-
mediate position
PTO (power to open): responds when the valve moves through
the switching contact towards the operating position (P14)
PTC (power to close): responds when the valve moves through
the switching contact towards the fail-safe position (P14)
Contact St
Fault alarm contact
Responds when a status message or error message is generat-
ed
(always NC contact).
CurrentspecicationswhencontactA
is not connected ContactB: I=50µA(wirebreakage)
ContactC: I=1.2mA
ContactSt: I=1.2mA

18 EB 8390 EN
Technical data
Table1: Explosion protection certicates for Type3738-20 Electronic Limit Switch
Type Certication Type of protection
3738-20
-110
EC type
examination
certicate
No. PTB08ATEX2039X II2GExiaIICT6;
II2DExiaIIICT80°CIP66
Date 2012-02-02
-113
No. RU C-DE.08.B.00114
1ExiaIICT6/T5/T4GaX;
ExtbIIICT80°CDbX
Date 2013-11-15
Valid un-
til 2018-11-14
-310
EC type
examination
certicate
No. PTB08ATEX2039X II2GExeb[ia]IICT4;
II2DExtbIIICT80°CIP66
Date 2012-02-02
-313
No. RU C-DE.08.B.00114
1Exe[ia]IICT4GbX;
ExtbIIICT80°CDbX
Date 2013-11-15
Valid un-
til 2018-11-14
-810
EC type
examination
certicate
No. PTB08ATEX2039X II3GExicIICT4;
II3GExnAIIT4Gc;
II3DExtcIIICT80°CIP66
Date 2012-02-02
-810 -812
No. GYJ12.1108X ExnLIICT4~T6Gc;
ExnAIICT4~T6Gc;
DIP A22 Ta, T4~T6
Date 2012-04-27
Valid un-
til 2017-04-26

EB 8390 EN 19
Technical data
4.2 Solenoid valve
Integrated solenoid valve (Type3738-20-xxx1400xxx000)
Current draw I = –3.325mA(correspondingto14.4mAat24V)
Version 3/2-way or 5/2-way function
Function determined by the position of the molded seal
KVS coefcient 0.32
Service life 1,000,000 switching cycles
Temperature range
(operation) –25to+80°C
Switching
voltage Nominal voltage 24 V DC, reverse polarity protection, galvanic isolation
Signal 0 Whenthevoltagefallsbelow15VDC
Signal 1 Min.18VDC
Switching capacity 24VDC;15.2mA(0.36W)
Duty cycle 100%
Static destruction limit 32VDC
External solenoid valve (Type3738-20-xxx1000xxxx00 Electronic Limit Switch)
Readmanufacturer’sspecications.
24VDC,max.18W
Switching
voltage Signal 0 Whenthevoltagefallsbelow15VDC
Signal 1 Min.18VDC
Static destruction limit 32VDC

20 EB 8390 EN
Attachment
5 Attachment
DANGER!
−Electrostatic charging
Due to the high surface resistance
of the enclosure cover (RIsol.≥
109Ω), installation and mainte-
nance on the equipment must be
performed in such a way as to pre-
vent electrostatic charging.
−Mechanical effects
In areas where damage to the
housing can be expected due to
mechanical inuences, the housing
must be protected by an additional
cover.
−Combustible dust atmospheres
The electronic limit switch complies
with the requirements for type of
protection Ex tb as the enclosure
(housing) is designed according to
EN60079-31. The housing has the
degree of protection IP66 accord-
ing to IEC60529.
WARNING!
Mount the electronic limit switch,
keeping the following sequence:
−Mount the electronic limit switch on
the actuator. See sections5.1 and
5.2.
−Connect the supply air. See sec-
tions6.1 and 6.2.
−Connect the electrical power. See
section6.3.
−Perform the start-up settings. See
section8.
NOTICE
Observe the following instructions to
avoid damaging the electronic limit
switch:
−Use only the accessories listed in
the Table3 to mount the electronic
limit switch.
−Observe the shaft height of the ac-
tuator on mounting the electronic
limit switch on rotary actuators!
Mounting position
Any mounting position may be used, howev-
er, the electronic limit switch must not be in-
stalled in a suspended position.