Samson 3738-50 Mounting And Operating Instructions
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Samson 3738-50 Mounting And Operating Instructions

Electronic limit switch
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Type 3738-50 Electronic Limit Switch
with optional integrated solenoid valve
for valves used in on/off applications
™ fieldbus communication
F
OUNDATION
Mounting and
Operating Instructions
EB 8390-5 EN
Firmware version A 1.01 / K 1.01
Edition August 2016

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Summary of Contents for Samson 3738-50

  • Page 1 Type 3738-50 Electronic Limit Switch with optional integrated solenoid valve for valves used in on/off applications ™ fieldbus communication OUNDATION Mounting and Operating Instructions EB 8390-5 EN Firmware version A 1.01 / K 1.01 Edition August 2016...
  • Page 2 Definition of signal words DANGER! NOTICE Hazardous situations which, if not Property damage message or mal- avoided, will result in death or seri- function ous injury Note:  WARNING! Additional information Hazardous situations which, if not avoided, could result in death or seri- Tip: ous injury Recommended action...

  • Page 3: Table Of Contents

    Attachment ....................22 Connections ....................26 Pneumatic connections..................26 Supply pressure ...................27 Electrical connection ..................27 Operator controls and readings ..............30 7.1 Rotary pushbutton ..................30 SAMSON SSP interface ................30 Local operation ....................30 Start-up ......................33 Adapting the display direction ..............33 Verifying readings on display................33 EB 8390-5 EN...
  • Page 4 Contents Determining the actuator type ...............34 Determining the direction of action ..............35 Adjusting the end positions ................35 Initialization ....................36 8.6.1 Start automatic initialization .................37 8.6.2 Start manual initialization ................37 Replacing an electronic limit switch ..............39 8.8 Zero/end position calibration ...............39 Reset to default settings .................40 Operation ....................40 9.1 Lock operation .....................40...

  • Page 6: Important Safety Instructions

    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.

  • Page 7: Article Code

    Article code 2 Article code Electronic Limit Switch Type 3738-50- x x x x x 0 0 x 1 x 0 0 x 0 With LCD Explosion protection Without 0 0 0 II 2G Ex ia IIC T6; II 2D Ex ia IIIC T80°C IP66 1 1 0 II 2G Ex eb[ia] IIC T4; II 2D Ex tb IIIC T80°C IP66 3 1 0 II 3G Ex ic IIC T4; II 3G Ex nA II T4 Gc; II 3D Ex tc IIIC T80°C IP66...

  • Page 8: Design And Principle Of Operation

    3.1 Versions grated or external solenoid valve as well as their discrete end positions to be read out by Version with integrated solenoid valve ™ fieldbus network according OUNDATION (Type 3738-50-xxx4x00x1x00x0) to IEC 61158-2. Major features of the electronic limit switch The solenoid valve is integrated into the include: housing of the electronic limit switch. The electronic limit switch and the solenoid valve −...
  • Page 9 7 Air capacity booster A/D converter (Type 3738-50-xxx4x00x1x00x0) Microcontroller 8* External solenoid valve Interface module (IEC 61158-2) (Type 3738-50-xxx0x00x1x00x0) Actuation of forced venting 9 Electrical isolation Solenoid valve 10 Display (Type 3738-50-xxx4x00x1x00x0) 11 Rotary pushbutton 12 Temperature sensor Optional Fig. 1: Schematic diagram – Type 3738-50 Electronic Limit Switch EB 8390-5 EN...

  • Page 10: Communication Using Trovis-View

    The electronic limit switch can be configured with SAMSON's TROVIS-VIEW Configura- All the functions and data of the electronic tion and Operator Interface. The electronic limit switch are assigned to various block limit switch has for this purpose a SAMSON types in F ™ fieldbus. Each block OUNDATION SSP interface to allow the RS-232 or USB type covers a different range of tasks. In the port of a computer to be connected to it over SAMSON Type 3738-50 Electronic Limit...

  • Page 11: Safety-Related Information

    Manual KH 8390-5. Notes concerning diagnostics − Diagnostics are performed cyclically in- 3.4 Safety-related information side the device. Critical errors (device er- ror E9) are transferred by a Discrete In- The Type 3738-50 Electronic Limit Switch put Function Block over the F OUNDA- was developed to meet the requirements stip- ™ fieldbus network. Existing errors TION ulated in IEC 61508. The safety-related data must be remedied as described in these are listed in the Manufacturer’s Declaration...

  • Page 12: Technical Data

    4.1 Electronic limit switch Type 3738-50-xxx4x00x1x00x0 3738-50-xxx0x00x1x00x0 Version With integrated solenoid valve For external solenoid valve Permissible range of rotation Min.: 0 to 30° Max.: 0 to 170° Commu- Local SAMSON SSP interface with serial interface adapter with TROVIS- nication VIEW with database module 3738-50 ™ Over bus fieldbus OUNDATION Supply Supply presure 2.4 to 8 bar Same as specifications of the sole- noid valve manufacturer Air quality Acc.
  • Page 13 Technical data Type 3738-50-xxx4x00x1x00x0 3738-50-xxx0x00x1x00x0 Version With integrated solenoid valve For external solenoid valve Maximum operating current 14 mA Permissible ambient –25 to 80 °C –40 to 80 °C temperature Metal cable glands must be used for ambient temperatures below –20 °C. The limits specified in the examination certificate additionally apply. Influenc- Temperature ±0.7 %/90° angle above the permissible temperature range Influence of 0.25 % up to 2500 Hz and 4 g according to IEC 770 vibrations Electromagnetic compatibility...

  • Page 14: Solenoid Valve

    EC type II 3G Ex ic IIC T4; Number PTB 08 ATEX 2039 X examination II 3G Ex nA II T4 Gc; 2012-02-02 Date certificate II 3D Ex tc IIIC T80°C IP66 4.2 Solenoid valve Integrated solenoid valve (Type 3738-50-xxx4x00x1x00x0) Version 3/2-way or 5/2-way function Function determined by the position of the molded seal coefficient 0.32 Service life 1,000,000 switching cycles Temperature range (operation) –25 to +80 °C External solenoid valve (Type 3738-50-xxx0x00x1x00x0) Read manufacturer’s specifications! 6 V DC, max. 18 mW...

  • Page 15: Attachment

    Attachment 5 Attachment NOTICE Observe the following instructions to DANGER! avoid damaging the electronic limit − Electrostatic charging switch: Due to the high surface resistance − Use only the accessories listed in of the housing cover (R  ≥ Table 2 to mount the electronic limit Isol.

  • Page 16: Accessories

    1380-1266 Mounting platform (black) ¼ NPT 1380-1268 Mounting platform with piping as required G ¼ 1380-1738 Mounting platform with piping as required ¼ NPT 1380-1739 TROVIS-VIEW Configuration TROVIS-VIEW with device module 3738-50 (free download from and Operator Interface soft- www.samson.de) ware Serial interface adapter (SAMSON SSP interface to 1400-7700 RS-232 port on a PC) Isolated USB interface adapter (SAMSON SSP interface 1400-9740 to USB port on a PC) EB 8390-5 EN...

  • Page 17: Attachment To Linear Actuators

    Required accessories: see Table 2 4. Remove the blanking plug on the supply air port (SUPPLY, 2.1) of the mounting 5.2.1 Preparations unit (2). Version with external solenoid valve Version with integrated solenoid valve (Type 3738-50-xxx0x00x1x00x0) (Type 3738-50-xxx4x00x1x00x0) (Fig. 2) 1. Fasten the electronic limit switch (1) to 1. Insert the molded seal (3) into the mount- the mounting unit (2) using the two ing unit (2) depending on the type of ac- screws mounted on the electronic limit tuator (single-acting or double-acting). switch as shown in Fig. 2. Double- acting...

  • Page 18: Attachment

    Attachment 5.2.2 Attachment Mounting to Type 3271 Actuators with 1400 and 2800 cm² actuator areas and Use the lever (5) underneath the mounting with 200 mm rated travel (Fig. 4 2 ) unit (2) and the pin (6) on the lever to adapt Fasten the follower plate (7.4) at the out- the electronic limit switch to the linear actua- er holes to the stem connector (9) of the tor. actuator using the screws (7.5). Mounting to Type 3271 Actuators with Table 3: Travel table 2800 cm²...
  • Page 19 Attachment Electronic limit switch Mounting unit Supply air port (SUPPLY) Screw Lever Disk spring Follower pin Washer Follower plate Washer Screws Follower plate Screws Bracket Screws Stem connector Fig. 4: Mounting the electronic limit switch on linear actuators EB 8390-5 EN...

  • Page 20: Attachment To Rotary Actuators

    Attachment 5.3 Attachment to rotary actuators The electronic limit switch is mounted on rotary actuators according to VDI/VDE 3845, lev- el 1 (2010). The version with integrated solenoid valve can be directly mounted to a P feiffer Type 31b Rotary Actuator. Required accessories: see Table 2 Versions with integrated solenoid valve Version for external solenoid valve (Type 3738-50-xxx4x00x1x00x0) (Type 3738-50-xxx0x00x1x00x0) Actuator surface Actuator surface Shaft height B [mm] Distance between holes A [mm] 80/130 Fig. 5: Mounting to rotary actuators according to VDI/VDE 3845, level 1 (2010)

  • Page 21: Preparations

    Attachment 5.3.1 Preparations 3. Press the molded seal (4) onto the air ducts underneath the mounting platform Version with integrated solenoid valve (2). (Type 3738-50-xxx4x00x1x00x0) (Fig. 7) 4. For attachment to rotary actuators with Two mounting platforms are available for at- a 50 mm shaft height: tachment (Fig. 6): Press the second molded seal (4) onto the air ducts underneath one of the distance −...

  • Page 22: Attachment

    Rotary Actuator with integrated air holes ator shaft. Î Connect internally using the molded c. Bend the flap on the anti-rotation fix- seal (4) ture (15) upward. Version with external solenoid valve d. Fasten intermediate plate (13) to the (Type 3738-50-xxx0x00x1x00x0) pins (16) using the screws (12). No preparation is necessary. Note concerning electronic limit  5.3.2 Attachment switches with integrated solenoid...
  • Page 23 Attachment Single-acting 3/2-way Double-acting 5/2-way Distance piece for attachment to rotary actuators with a 50 mm shaft height Electronic limit switch Mounting platform Molded seal O-ring Molded seal Distance piece Fig. 7: Preparations for mounting the electronic limit switch with integrated solenoid valve EB 8390-5 EN...
  • Page 24 Attachment Electronic limit switch with integrated sole- Note concerning electronic limit  noid valve: connect supply air to supply air switches with integrated solenoid port (SUPPLY, 2. valve: Fasten the mounting platform (2), making sure that the air ducts located on the rotary actuator and the mounting platform are properly aligned.
  • Page 25 Attachment EB 8390-5 EN...

  • Page 26: Connections

    Operation with external solenoid mode. valve Do not touch the actuator shaft/stem (Type 3738-50-xxx0x00x1x00x0): or obstruct it to avoid risk of injury to The input pressure must not exceed hands or fingers. the maximum supply pressure of...

  • Page 27: Supply Pressure

    6.2 Supply pressure The maximum permissible values specified in the EC type examination Version with integrated solenoid valve certificate apply when connecting (Type 3738-50-xxx4x00x1x00x0) the intrinsically safe circuits. Depending on the mounting platform used Adhere to the terminal assignment (ISO 228/1–G ¼ or ¼–18 NPT), customary specified in the certificate! Switching...
  • Page 28 Connections The cable entries of the electronic − When two separate cables are limit switch with external non-intrinsi- used for connection, an addition- cally safe solenoid valve must be cer- al cable gland can be installed. tified according to type of protection −...
  • Page 29 Connections Version with integrated solenoid valve (Type 3738-50-xxx4x00x1x00x0) Version for external solenoid valve (Type 3738-50-xxx0x00x1x00x0) Fig. 9: Electrical connection EB 8390-5 EN...

  • Page 30: Operator Controls And Readings

    Press : Confirm setting/exit parameter can be changed and the device can be initial- ized. 7.2 SAMSON SSP interface To switch over modes, the key code must be The SAMSON SSP interface is located un- entered first. The key code can be found on derneath the housing cover. page 71. To avoid unauthorized use of the key code, remove the page or make the The local SAMSON SSP interface of the key code unreadable. electronic limit switch needs to be connected...
  • Page 31 Placing the electronic limit switch into operation using its default settings Initial reading Initial reading (electronic limit (electronic limit switch not initialized) switch initialized) P1: Reading direction Return to RUN mode [1234] ¿ Enter key code: P4: Actuator type If the wrong key [ROT] code is entered, the mode does not change P5: Actuator's...
  • Page 32 Changing the operating mode and parameter settings Initial reading Initial reading (electronic limit (electronic limit switch initialized) switch initialized) Return to RUN mode ¿ ¿ Enter key code: If the wrong key code is entered, the mode does not change Enter key code: If the wrong key code is entered, the mode does not change ¿...

  • Page 33: Start-Up

    Start-up 8 Start-up Note:  The current angle of rotation is set to WARNING! 0° by pressing the rotary pushbutton Mount the electronic limit switch, ( ). keeping the following sequence: − Mount the electronic limit switch on − The current angle of rotation is displayed the actuator.

  • Page 34: Determining The Actuator Type

    Start-up The display’s functioning is checked using the P3 parameter. P3: Display reading 8 P3: Display reading 1 P3: Display reading 9 P3: Display reading 2 P3: Display reading 10 P3: Display reading 3 g P3 Turn Press , reading 1 Turn , reading 2 to 10 P3: Display reading 4 Press to confirm testing. The last test of the...

  • Page 35: Determining The Direction Of Action

    Start-up 8.5 Adjusting the end positions Turn ROT (rotary actuator)/ LIN (linear actuator) The end positions can be adjusted within the Press to confirm the actuator type and to rotational range. The end positions are set in exit the parameter. the P7 (Switching contact, lower end posi- tion) and P8 (Switching contact, upper end Note:  position) parameters. After initialization, this parameter is locked and can first be changed after Direction of action PTO: Direction of action PTC: performing a reset of the start-up da-...

  • Page 36: Initialization

    Start-up Observe the assignment of the end position NOTICE depending on the direction of action (page After the electronic limit switch has 71)! been mounted onto another actuator or its mounting location has been P7: Switching contact, changed and prior to re-initializing, lower end position Default: 2.0 % the electronic limit switch needs to be...

  • Page 37: Start Automatic Initialization

    Start-up 8.6.1 Start automatic initial- transit times for opening and closing the valve. ization After the initialization has been successfully completed, the current valve position in % is Note:  indicated. The automatic initialization can be canceled by pressing the rotary push- The electronic limit switch is in the configura- button ( ). ESC appears on the dis- tion mode (SET).
  • Page 38 Start-up test cannot be started (refer to sec- Turn g P10 tion 9.2 on page 41). Press six seconds long. The seconds re- maining until the position check starts ap- pear on the display. P10: Initialization is Display: POS1 being prepared Î Move the valve to the fail-safe position manually (de-energize the solenoid valve). P10: Confirmation of Press to confirm the fail-safe position g fail-safe position...

  • Page 39: Replacing An Electronic Limit Switch

    Start-up 8.8 Zero/end position calibra- − E3: Max. travel exceeded − E6: Time-out tion 8.7 Replacing an electronic When the zero point or end positions are in- correct, it may be necessary to recalibrate limit switch them. Always perform an end position cali- An (old) electronic limit switch can be re- bration for the fail-safe position and for the placed by another (new) electronic limit operating position. switch of the same type by performing an The electronic limit switch must be in the con- end position calibration in the operating or...

  • Page 40: Reset To Default Settings

    Operation 8.9 Reset to default settings Operation This function resets all parameters to the fac- WARNING! tory default settings (see parameter list in The actuator shaft/stem moves while section 13 on page 50). the electronic limit switch is operat- All error and status messages are also reset. ing. Do not touch the actuator shaft/stem NOTICE or obstruct it to avoid risk of injury to After performing a reset, the elec-...

  • Page 41: Lock Local Operation

    Operation Press Partial stroke testing (PST) can only be per- Operation over F formed on an automatically initialized de- ™ fieldbus is OUNDATION locked. vice (P9). Refer to section 8.6.1. Deactivate locking Test procedure (Fig. 12) g P18, display: FF The electronic limit switch issues pulses of Turn various lengths to the solenoid valve (briefly Press , P18 blinks de-energizing it) during the partial stroke test Turn g NO (PST), moving the valve further towards the Press fail-safe position.
  • Page 42 Operation Direction of action PTO DI FB* = 2 DI FB* = 2 DI FB* = 1 DI FB* = 1 DI FB* = 1 DI FB* = 1 x [%] MGV Off MGV On Hold time Dead time t [s] Transit time Start PST Start PST...

  • Page 43: Defining The Pst Target Range

    Operation Note: NOTICE  − If the travel of the PST is monitored It is important to take the process and, if necessary, the status mes- conditions (e.g. pressure, medium, sages F6 ('PST: tolerance band not dead time, breakaway torque and reached') and F7 ('PST: tolerance torque of the valve) into account on band exceeded') are to be generat-...

  • Page 44: Configuration Example Based On Pto Direction Of Action

    Operation Start PST automatically at defined intervals (RUN mode) P17: Test in progress The test is performed automatically after a time interval (days) entered in P16 ('Interval for PST). g P17 (travel range in %) Turn NOTICE Press six seconds long. The automatic test causes the valve to The seconds remaining until the test starts leave its operating position without a appear on the display.
  • Page 45 Operation test, the valve is moved from the operating When the status message F6 or F7 is position towards the fail-safe position to a generated, check the attachment, supply step end of 90 % by briefly de-energizing air lines and the valve. The setting for the the solenoid valve. During the test, the valve target range might need to be adapted must not move beyond a position of 85 % in the P14 and P15 parameters.
  • Page 46 Operation Check the voltage supply and solenoid In this example, the valve does not reach the valve wiring when the status message F8 PST target range during the first partial ('PST: solenoid valve de-energized/ stroke test and moves beyond it. The test was forced venting active') is generated. not successfully completed. In the second au- tomatic test, the valve initially does not reach Check the attachment and supply air line the PST target range. The next step though when the status message F9 ('PST: time- ends in the PST target range, meaning the out') is generated.

  • Page 47: Testing The Solenoid Valve

    Operation 9.3 Testing the solenoid valve 9.4 Fault You can de-energize the solenoid valve while 9.4.1 Status messages the voltage is still applied using the P20 pa- rameter. In this case, the valve moves to the When a status message is generated, the fail-safe position. fault icon appears on the display in the RUN Observe the assignment of the end position operating mode.

  • Page 48: Error Messages

    The electronic limit switch must be in the con- cannot occur. figuration mode (SET). See page 32. Turn g F0/…/F10, STAT or E0/…/E10, Version with integrated solenoid valve (Type 3738-50-xxx4x00x1x00x0) , F0/…/F10, E1/…/E10 blinks Press There are filters with a 100 µm mesh size in g RST Turn the pneumatic connections for supply and...

  • Page 49: Servicing Explosion-Protected Devices

    The maintenance instructions of any up- Firmware updates on electronic limit switches stream supply air pressure reducing stations currently in operation can be performed as must be observed. follows: When updates are performed by a service employee appointed by SAMSON, the up- 11 Servicing explosion-protect- date is confirmed on the electronic limit switch by the test mark assigned by SAM- ed devices SON’s Quality Assurance. If a part of the device on which the explosion In all other cases, only plant operator per-...

  • Page 50: Parameter List

    Parameter list 13 Parameter list Parameter – Readings, values [default setting] Description Parameters marked with an asterisk (*) can only be changed when the electronic limit switch is in the SET configuration mode (set in P2). Info: actual value After initialization: current valve position in % See section Keep pressed down –> current valve position in ° (angle) Prior to initialization: travel in ° Reading direction The reading direction of the display is turned by See section 180°.
  • Page 51 Parameter list Parameter – Readings, values [default setting] Description Info: forced venting Shows whether the forced venting option exists – or not (YES/NO) Switching contact, lower end The following applies: See section position Switching contact for fail-safe position 0.5 % to (P8 – 2.0 %) · ESC Switching contact for operating position [2.0 %] Observe the assignment of contacts A and B depending on the direction of ac- tion (see page 71)! Switching contact, upper end The following applies: See section position...
  • Page 52 Parameter list Parameter – Readings, values [default setting] Description P15* PST tolerance band Tolerance added to the PST step end position. See section 4.0 to 96.0 % · ESC The partial stroke test has been completed suc- cessfully when the valve has reached the target [10.0 %] range ('PST step end' ± ½ 'PST tolerance band') by one pulse, but not exceeded it. P16* Interval for PST Interval between automatic partial stroke tests See section [OFF] · 1 to 999 days · ESC Start manual PST A single automatic partial stroke test is started.
  • Page 53 Parameter list Parameter – Readings, values [default setting] Description Info: temperature Current operating temperature [°C] inside the – electronic limit switch Keep pressed down –> reading in °F Info: operating hours Number of operating hours – Rotary motion P26* Limit for movement counter Status message F2 is generated when the max. – number of rotary motions has been reached. OFF · 100 to 9.9E7 · ESC [1.0E4] Note: The monitoring of the rotary motions is deactivated by P26 = OFF. P27* Reset movement counter The unopened parameter indicates the number –...

  • Page 54: Status Messages

    Parameter list 13.1 Status messages Status message Possible causes Status messages marked with an asterisk (*) can be confirmed in SET configuration mode. See section 9.4.1. TROVIS-VIEW: Current status messages are saved with a time stamp in [Diagnostics – Status mes- sages]. • Mechanical blockage Stationary outside re- quired/desired end • Supply pressure too low positions • External leakage Recommended action • Check attachment and supply air line. • Supply pressure too low Left end position with- out being required to •...
  • Page 55 Parameter list Status message Possible causes • Mechanical blockage Actuator stationary when required to • Supply pressure too low move • External leakage Note: If the valve Recommended action moves after a delay, • Check attachment and supply air line. F5 remains active until the next successful switching demand.

  • Page 56: Error Messages

    Parameter list 13.2 Error messages Error message Possible causes Error messages marked with an asterisk (*) can be confirmed in SET configuration mode. See section 9.4.2. TROVIS-VIEW: The last 32 error messages are displayed with a time stamp in [Diagnostics – Log- ging of device errors]. • The electronic limit switch has not yet been initialized. No initialization Recommended action • Start initialization with P9 or P10 parameter. • Mechanical blockage INIT: actuator does not move • Supply pressure too low •...
  • Page 57 If the error still occurs even if the screw with magnet is fastened properly, the electronic limit switch needs to be replaced in the near future. The device still func- tions properly. • Internal error Recommended action • Restart the electronic limit switch (return it to SAMSON if error repeatedly occurs). E10* • Internal error Device error 2 Recommended action •...

  • Page 58: Dimensions In Mm

    Dimensions in mm 14 Dimensions in mm EB 8390-5 EN...
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  • Page 69 Index Index End position calibration ....40 End positions ........ 36 Actuator type ........ 35 Error messages ....... 49, 57 Article code ........7 Attachment accessories ......16 Fault ..........48 to linear actuators ....17 Firmware update ......50 to rotary actuators ....20 Initialization Block model automatic .......
  • Page 70 Index Rotary pushbutton ......31 Safety instructions......11 Safety-related information ....11 Servicing ........50 SSP interface ......... 31 Start-up ........34 Status messages ...... 48, 55 Supply .......... 28 Supply pressure ......28 Switching contacts ......36 Technical data electronic limit switch ....12 solenoid valve ......

  • Page 71: Assignment Based On The Direction Of Action

    Assignment based on the direction of action Assignment based on the direction of action PTO (power to open) DI1 state Position Switching contact for end position DI1 = 0 Fail-safe position (0 %) · Valve CLOSED P7 (0.5 % to P8 – 2.0 % [2.0 %]) Operating position (100 %) · Valve DI1 = 1 P8 (P7 + 2.0 % to 99.5 %, [98.0 %]) OPEN PTC (power to close) DI1 state Position Switching contact for end position...
  • Page 72 SAMSON AG · MESS- UND REGELTECHNIK Weismüllerstraße 3 · 60314 Frankfurt am Main, Germany Phone: +49 69 4009-0 · Fax: +49 69 4009-1507 EB 8390-5 EN samson@samson.de · www.samson.de...

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