Samson 3767 Mounting And Operating Instructions
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Samson 3767 Mounting And Operating Instructions

Electropneumatic positioner
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See also: Mounting and Operating Instructions
Electropneumatic Positioner
Type 3767
Fig. 1 · Type 3767
Fig. 2 · Type 3767
Mounting and
Operating Instructions
EB 8355-2 EN
Edition April 2011

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Summary of Contents for Samson 3767

  • Page 1 Electropneumatic Positioner Type 3767 Fig. 2 · Type 3767 Fig. 1 · Type 3767 Mounting and Operating Instructions EB 8355-2 EN Edition April 2011...

  • Page 2: Table Of Contents

    Contents Contents Page Design and principle of operation ....4 Versions ....... . 7 Technical data .
  • Page 3 Safety instructions General safety instructions The positioner may only be assembled, started up or operated by trained and experienced personnel familiar with the product. According to these mounting and operating instructions, 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 relevant stan- dards.

  • Page 4: Design And Principle Of Operation

    (11) are used to optimize the The positioner is designed either for direct positioner control loop. The pick-up lever (1) attachment to SAMSON Type 3277 Actua- and the range spring (4) must be selected to tors or for attachment according to NAMUR match the rated valve travel and the nominal (IEC 60534-6) with an adapter housing.
  • Page 5 Design and principle of operation Travel Supply Pick-up lever Span adjuster Zero adjuster Clamp Turnboard Nozzle >> Xp restriction Nozzle <> Pressure regulator Diaphragm lever Booster Range Volume restriction spring 8 9 10 Solenoid valve Measuring (optional) diaphragm i/p converter Fig.
  • Page 6 Design and principle of operation Positioner with position transmitter A positioner containing a position transmit- ter cannot be equipped with integrated limit switches or an integrated solenoid valve since the position transmitter requires most of the space inside. The position transmitter is used to establish a certain relationship be- tween the valve position, i.e.

  • Page 7: Versions

    Versions 1.1 Versions Electropneumatic positioner Type 3767- 0 0 0 Explosion protection Without II 2 G EEx ia IIC T6 acc. to ATEX FM/CSA intrinsically safe/non incendive II 3 G EEx nA II T6 acc. to ATEX Additional equipment Without...

  • Page 8: Technical Data

    Technical data 1.2 Technical data Positioner Travel range, adjustable Direct attachment: 7.5 to 30 mm Attachment acc. to IEC 60534-6: 7.5 to 120 mm or Depending on the cam disk: 30 to 90° Opening angle Reference variable Signal range 4 (0) to 20 mA 1 to 5 mA Span 8 to 20 mA...
  • Page 9 Technical data Inductive limit switches 2 proximity switches Type SJ 2-SN Control circuit Ratings according to downstream transistor relay £ 1 % Hysteresis at rated travel Solenoid valve Input Binary direct current signal Nominal signal 6 V DC 12 V DC 24 V DC Signal 0 (no pick-up), £...

  • Page 10: Attachment To Control Valve

    The positioner is attached either directly to turn the board by 180°, and refasten the SAMSON Type 3277 Actuator or to valves turnboard with the screw. Make sure the with cast yokes or with rod-type yokes in ac- three rubber gaskets inserted in the housing cordance with IEC 60534-6 (NAMUR).
  • Page 11 Attachment to control valve Actuator stem extends Internal signal pressure Op. direction >> connection Operating Attachment left direction <> Connection block Attachment right Tip of gasket (16) Actuator stem retracts Signal pressure connection over piping Op. direction <> Operating Attachment left direction >>...
  • Page 12 Attachment to control valve 1. Screw the clamp (1.2) to the actuator 8. Place the connection block with its seals stem. Make sure that the fastening screw on the positioner and the actuator yoke is located in the groove of the actuator and screw tight using the fastening stem.
  • Page 13 Attachment to control valve use piping (Table 3) to connect the spring Note: When the valve is installed, the side chamber (with version "Actuator stem ex- cover of the actuator must be mounted such tends") to the connection block. To do so, re- that the vent plug points downward.
  • Page 14 Attachment to control valve Table 1 Mounting kit Required lever with associated clamp and distance plate Actuator size [cm²] Order no. G ¼ 1400-6790 D1 with vent plug for output (38) Connecting thread ¼ NPT 1400-6791 D1 (33 mm long with 17-mm-high clamp) 240 and 350 1400-6370 D2 (44 mm long with 13-mm-high clamp)

  • Page 15: Attachment According To Iec 60534-6

    Attachment to control valve 2.2 Attachment according to IEC 60534-6 Required mounting parts are listed in Table 5. The rated travel of the valve determines which lever and range spring (Table 6) are required. Spring Plug screw An adapter housing (Fig. 7) is required for Fig.

  • Page 16: Mounting Sequence

    Attachment to control valve clip must be clamped onto the lever (18) 2.2.1 Mounting sequence with the open side pointing downward. Choose the required mounting parts and 6. Plug the lever (18) together with the range spring from Table 4 or 5 and install clamping plate (22) on the shaft (25).
  • Page 17 Attachment to control valve Mounting position Attachment to NAMUR rib 24 25 21 20 Lever N1, N2 Attachment to rod-type yoke Plate Clip Clamping plate Screw Pointer Shaft Lever of the positioner Lock nut Bracket Studs Plate Nuts Mounting bracket Fig.
  • Page 18 Attachment to control valve Table 5 Control valve Travel [mm] With lever Order no. 7.5 to 60 N1 (125 mm) 1400-6787 Valve with cast yoke NAMUR mounting kit, 22.5 to 120 N2 (212 mm) 1400-6789 Refer to Fig. 7 20 to 25 1400-6436 concerning parts 20 to 25...

  • Page 19: Attachment To Rotary Actuators

    Table 7 are used. Table 7 · Complete mounting parts, including range spring 2, but excluding the cam disk Order no. Attachment acc. to VDI/VDE 3845, level 1 1400-8815 SAMSON Type 3278 Actuator 160 cm² 1400-7103 VETEC Type S 320 cm²...

  • Page 20: Mounting The Cam Follower Lever

    When attaching the positioner to the 3. Align the cam disk (40) and scale (39) SAMSON Type 3278 Rotary Actuator (Fig. as described in section 2.3.3 and fasten 8, left), the actuator's inside and the unused with screws.
  • Page 21 Attachment to control valve Attachment to SAMSON Type 3278 Attachment acc. to VDI/VDE 3845 Vent plug or filter check valve Positioner Intermediate piece Lever with cam follower roll Adapter Feedback lever Screws Scale Cam disk Actuator shaft Plate Mounting bracket Coupling Fig.

  • Page 22: Default Setting Of The Cam Disk

    Attachment to control valve Use the turnboard (7) to adjust the operating 2.3.3 Default setting of the cam direction of the positioner, i.e. whether the disk valve opens or closes when the reference variable increases (direct >> or reverse <>). The valve model used determines the default Each cam disk carries two cam sections setting of the cam disk.
  • Page 23 Attachment to control valve Single-acting spring-loaded rotary actuator Linear cam disk (equal percentage cam disk is represented by a broken and dotted line) Valve opens counterclockwise For valves that open clockwise, the cam disk must be turned over so that the cam follower roll moves over the same disk segments as shown in the figures below, but with the cam disk turning clockwise.
  • Page 24 Attachment to control valve Double-acting springless rotary actuator with reversing amplifier Linear cam disk (equal percentage cam disk is represented by a broken and dotted line) View from the positioner onto the actuator shaft Valve opens counterclockwise – Starting position: valve CLOSED Direct operating direction >>...
  • Page 25 Attachment to control valve Securing the aligned cam disk To additionally prevent the cam disk from being turned, drill a bore into the adapter (36) or the coupling (44) and install a 2 mm dowel pin. Four bore holes are located centrically around the center bore hole on the cam disk.

  • Page 26: Reversing Amplifier For Double-Acting Actuators

    4. Screw the supplied filter (1.6) using a positioner must be fitted with a reversing screwdriver (8 mm wide) into the con- amplifier, e.g. the SAMSON Type 3710 Re- necting bore holes A and Z. versing Amplifier (see Mounting and Oper- ating Instructions EB 8392 EN).
  • Page 27 Attachment to control valve From the positioner Control signals to the actuator Reversing amplifier Special screws Gasket Special nuts Rubber seal Sealing plug Filter Fig. 11 · Mounting a reversing amplifier (1079-1118 or 1079-1119) EB 8355-2 EN...

  • Page 28: Connections

    Connections Connections Note: When using older models with index 3767-x...x. 02 or lower, mounting parts will 3.1 Pneumatic connections have to be replaced as well. The pneumatic connections are designed as tapped holes with ¼ NPT or G ¼ thread.
  • Page 29 Connections Actuator stem retracts (FE): Fail-safe position "Valve OPEN" (for globe and angle valves) The required supply pressure for a tight-closing valve is roughly estimated from the maximum signal pressure pst × × = F + [bar] × d = Seat diameter [cm] Dp = Differential pressure at the valve [bar] A = Actuator diaphragm area [cm²] F = Upper range value of the actuator...

  • Page 30: Electrical Connections

    Connections In particular, the radial thickness of the con- 3.2 Electrical connections ductor insulation for common insulation ma- terials, such as polyethylene, must have a DANGER! minimum radial thickness of 0.2 mm. Risk of electric shock and/or the The diameter of an individual wire in a formation of an explosive atmo- fine-stranded conductor must not be smaller sphere!

  • Page 31: Switching Amplifiers

    The wiring for the reference variable is led Accessories: to the terminals 11 and 12. Positioner index 3767-x...x. 03 or lower The positioner does not have to be con- Cable gland PG 13.5 nected to a bonding conductor. If need be, Plastic, black Order no.

  • Page 32: Operation

    Operation variable. The reference variable range and Operation thus the upper range value determine the travel of the valve. 4.1 Adjusting the positioner at the valve In split-range operation (Fig. 13, right), the control valves operate on smaller reference variables. The controller output signal is Starting point and reference variable used to control two control valves, dividing it When adjusting the positioner directly at the...

  • Page 33: Adjusting The Proportional Band Xp And Air Delivery Q

    Operation 4.1.2 Adjusting the actuator: Note: When the positioner is controlled by a "Actuator stem extends" computer whose signal is limited, e.g. be- tween 4 to 20 mA, set the positioner to the Starting point (e.g. 4 mA) range from 4.5 to 20 mA. This is the only way to ensure that the actua- 1.

  • Page 34: Adjusting The Actuator: "Actuator Stem Retracts

    Operation 4. Correct any deviations on the zero ad- When the input signal is 4 mA and the op- juster (6.2). Turning the adjuster counter- erating direction >>, or the input signal is clockwise causes the valve to move from 20 mA and the operating direction <>, the its end position earlier;...

  • Page 35: Changing The Operating Direction

    Operation 4.2 Changing the operating direction If you want to change the operating direc- tion of directly attached positioners (Fig. 3) after they have been installed, turn the turnboard (7) and change the position of the connection block, the positioner, and the clamp (1.2).

  • Page 36: Adjusting The Limit Switches

    Operation ing the associated nameplate on the termi- 4.3 Adjusting the limit switches nal block (also see Fig. 12). The positioner version with inductive limit switches has two adjustable tags mounted Note: As the tags of the limit switches can- on a rotary axis which operate the associ- not be turned by 360°, make sure that the ated proximity switches (50).
  • Page 37 Operation Setting the switching point Move the valve to the switching position and adjust the tag by turning the adjustment screw (53) so that the switching point is reached and indicated by the LED on the switching amplifier. To ensure safe switching under any condition, the switching point is to be adjusted to stop approx.

  • Page 38: Adjusting The Position Transmitter

    Operation 4.4 Adjusting the position Zero point (ZERO) transmitter Use the switches 1 and 2 to preset the zero point and the ZERO potentiometer for fine-tuning. The adjusted value always refers Note: The starting point (zero) and upper to 4 mA. range value (span) must be set before cali- brating the position transmitter.
  • Page 39 Operation Adjusting the zero point Note on adjusting the position transmitter for positioners with NAMUR adapter 1. Use the input signal of the positioner to housing move the valve to closed position (valve When the positioner and the position CLOSED – travel 0 %). transmitter signal have different operating 2.

  • Page 40: Converting And Retrofitting The Positioner

    Converting and retrofitting the positioner 3. Place the connecting plate (3) with the Converting and retrofitting seal on the housing bores and screw the positioner tight. The restriction must be seated in the seal above the right internal bore. Read instructions in section 6 for explo- 4.

  • Page 41: Fitting Limit Switches

    Accessories: Limit switch retrofit kit depend- 6. Screw additional cable gland on the ing on model index 3767-xxxxxxxxxx.04 housing. Order no. 1400-8810 for index .06 or higher 5.3 Fitting a solenoid valve Order no.1400-7573 for index .04/.05...

  • Page 42: Removing The Solenoid Valve

    Servicing explosion-protected versions 5. Insert the panel (9) at the rear of the Servicing explosion-protected positioner and attach it to the input unit versions using two screws. If a part of the device on which the explo- 6. Guide the connecting cable down behind sion protection is based needs to be ser- the mounted panel of the input unit and viced, the device must not be put back into...

  • Page 43: Dimensions In Mm

    Dimensions in mm Dimensions in mm Pneumatic connections G ¼ or ¼ NPT M20 x 1.5 19.5 Output (38) Input signal Supply (9) Reversing amplifier (optional) Ø110 Attachment with intermediate Attachment IEC 60534-6 piece for rotary actuators (NAMUR) with adapter housing Pneum.

  • Page 44: Test Certificates

    EB 8355-2 EN...
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  • Page 56 SAMSON AG · MESS- UND REGELTECHNIK Weismüllerstraße 3 · 60314 Frankfurt am Main · Germany Phone: +49 69 4009-0 · Fax: +49 69 4009-1507 EB 8355-2 EN Internet: http://www.samson.de...

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