Samson 3725 Mounting And Operating Instructions
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Samson 3725 Mounting And Operating Instructions

Electropneumatic positioner
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See also: Mounting and Operating Instructions
Series 3725
Type 3725 Electropneumatic Positioner
Mounting and
Operating Instructions
EB 8394 EN
Firmware version 1.12
Edition June 2014

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Summary of Contents for Samson 3725

  • Page 1 Series 3725 Type 3725 Electropneumatic Positioner Mounting and Operating Instructions EB 8394 EN Firmware version 1.12 Edition June 2014...
  • 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

    Contents General safety instructions ................6 Article code ....................7 Design and principle of operation ..............8 Technical data .....................10 Mounting the positioner ................12 Mounting sequence ..................12 Lever and pin position ..................12 Direct attachment ..................14 4.3.1 Type 3277-5 and Type 2780-2 Actuators ............14 4.3.2 Type 3277 Actuator ..................18 4.4 Attachment according to IEC 60534-6 ............20 4.5 Attachment to Type 3372 Actuator (V2001) ...........22 4.6...
  • Page 4 Contents Settings .......................39 8.1 Adapting the display ..................39 8.2 Enabling configuration to change parameters..........39 8.3 Adjusting the volume restriction Q ..............40 8.4 Entering the direction of action ..............41 8.5 Entering the direction of action ..............41 8.6 Limiting the signal pressure ................42 8.7 Setting other parameters ................42 8.8 Initialization ....................43 8.8.1 Canceling initialization .................44 8.9 Zero calibration ...................44 8.9.1 Canceling zero calibration ................45 8.10 Manual mode ....................45 8.11 Reset ......................47 8.12 Fault ......................47 8.12.1...
  • Page 5 Contents Firmware revisions 1.02 (old) 1.03 (new) Internal revisions 1.03 (old) 1.10 (new) Setting of the travel in steps of 0.5 mm (P4 parameter code) Monitoring of the end stops only during initialization and in man- ual mode To suppress common-mode interference on the signal lines, the D component of the positioner is switched off when the actuator is at a standstill. 1.10 (old) 1.11 (new) Internal revisions 1.11 (old) 1.12 (current version) Internal revisions EB 8394 EN...

  • Page 6: General Safety Instructions

    General safety instructions 1 General safety instructions For your own safety, follow these instructions concerning the mounting, start up and opera- tion of the positioner: − 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 in the valve by the process medium, the signal pres- sure or by moving parts are to be prevented by taking appropriate precautions. − 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. Note: ...

  • Page 7: Article Code

    Article code 2 Article code Positioner Type 3725- x With LCD and autotune, 4 to 20 mA reference variable Explosion protection Without Intrinsic safety: ATEX Intrinsic safety: STCC Intrinsic safety: CSA Intrinsic safety: GOST See Table 1 for details on explosion protection certificates. Table 1: Summary of explosion protection certificates Type Certification Type of protection Number No. 2860 STCC 0 Ex ia IIC T4 X Valid until 2017-10-08 Number PTB 11 ATEX 2020 X 3725-1100 Date 2011-08-25 II 2 G Ex ia IIC T4...

  • Page 8: Design And Principle Of Operation

    Design and principle of operation 3 Design and principle of oper- changed so that the actuator of the valve (1) is pressurized or vented accordingly over the ation downstream booster (7). The supply air is The Type 3725 Electropneumatic Positioner is supplied to the booster and the pressure reg- mounted on pneumatic control valves and is ulator (8). used to assign the valve position (controlled The output signal pressure supplied by the variable x) to the control signal (reference...
  • Page 9 Design and principle of operation Valve Air capacity booster Sensor Pressure regulators A/D converter Fixed restriction Microcontroller Volume restriction D/A converter Display i/p converter Fig. 1: Circuit diagram EB 8394 EN...

  • Page 10: Technical Data

    Design and principle of operation 3.1 Technical data Type 3725 Positioner Travel (adjustable) Direct attachment to Type 3277: 5 to 30 mm Direct attachment to Type 2780-2: 6/12/15 mm Attachment to Type 3372 Actuator: 15/30 mm Attachment according to IEC 60534-6 (NAMUR): 5 to 50 mm Attachment to rotary actuators: 24 to 100° Reference variable w 4 to 20 mA signal range · Two-wire device (reverse polarity protec- Split-range operation 4 to 11.9 mA and 12.1 to 20 mA tion) ±33 V Static destruction limit Minimum current 3.8 mA...
  • Page 11 Design and principle of operation Safety Influences Temperature: ≤ 0.15 %/10 K Effect of vibration: ≤ 0.25 % up to 2000 Hz and 4 g according to IEC 770 Supply air: None Electromagnetic Complying with EN 61000-6-2, EN 61000-6-3 and NAMUR Recommendation NE 21 compatibility Intrinsic safety: ATEX, STCC, CSA, GOST Explosion protection  1) Degree of protection IP 66 · Compliance Materials Housing Polyphthalamide (PPA) Cover Polycarbonate (PC) External parts Stainless steel 1.4571 and 1.4301 Cable gland M20x1.5, black polyamide (PA) Vent plugs High-density polyethylene (PE-HD) Weight Approx.

  • Page 12: Mounting The Positioner

    Mounting the positioner 4 Mounting the positioner the positioner and the pin inserted into the lever. The Type 3725 Positioner is suitable for the The travel tables on page 13 show the as- following types of attachment: signment between the required lever and pin − Direct attachment to SAMSON position. Type 3277 and Type 2780-2 Actuators The positioner is equipped with the M lever − Attachment to actuators according to (pin position 35) as standard.
  • Page 13 [cm²] [mm] Min. Travel Max. 6/12 5.0 mm 16.0 mm 7.0 mm 22.0 mm Attachment according to IEC 60534-6 (NAMUR) SAMSON Type 3271 Actuator Travel of other valves Required Assigned lever pin position Rated travel Size [cm²] Min. Max. [mm] 5.0 mm 16.0/25.0   mm 120/240/350 7.0 mm...

  • Page 14: Direct Attachment

    Mounting the positioner 4.3 Direct attachment 4. 15 mm travel: Keep the follower pin (2) on the M lever (1) on the back of the po- 4.3.1 Type 3277-5 and sitioner in the pin position 35 (delivered state). 7.5 mm travel: Remove the fol- Type 2780-2 Actuators lower pin (2) from the pin position 35, Î Required mounting parts and accesso- reposition it in the hole for pin position ries: Table 2 on page 29. 25 and screw tight. Î Observe travel tables on page 13. 5. Insert formed seal (15) into the groove of the positioner housing. Actuator with 120 cm² diaphragm area 6. Place positioner on the actuator in such a Depending on the type of positioner attach- manner that the follower pin (2) rests on...
  • Page 15 Mounting the positioner Lever 1.1 Nut Symbols Switchover plate (9) 1.2 Disk spring Follower pin Actuator stem Follower clamp extends Screw plug Sealing plug Left attachment Right attachment Connecting plate 6.1 Seals Pressure gauge Actuator stem bracket retracts Pressure gauge Signal pressure mounting kit input for left Switchover plate Signal pressure attachment (actuator) Marking...
  • Page 16 Mounting the positioner Additional solenoid valve If a solenoid valve is additionally mounted onto the actuator, the signal pressure port at the back of the positioner must be sealed (see Fig. 6). To do this, unscrew the screw plug located in the middle hole (screw plug in park position) and screw it into the signal pressure port to seal it. In this case, route the signal pressure from the signal pressure output to the actuator over the connecting plate (6) or pressure gauge bracket (7). The connecting plate (ac- cessories for the actuator) replaces the swi- tchover plate (9). Cover Vent plug Note:  The switchover plate and connecting plate are accessories for the actuator (120 cm²).They are listed in sec- tion 4.7 on page 29.
  • Page 17 Mounting the positioner Screw plug (4) (signal pressure port) Park position Fastening screw Fig. 6: Signal pressure port and park position for screw plug EB 8394 EN...

  • Page 18: Type 3277 Actuator

    Mounting the positioner 4.3.2 Type 3277 Actuator The lever (1) must rest on the follower clamp with spring force. Î Required mounting parts and accesso- Fasten the positioner on the actuator us- ries: Table 3 on page 29. ing the two fixing screws. Î Observe travel tables on page 13. 5. Make sure that the tip of the gasket (16) projecting from the side of the connec- Actuators with 240 to 700 cm² effective ar- tion block is positioned to match the ac- tuator symbol for the actuator's fail-safe The positioner can be mounted either on the action "actuator stem extends"...
  • Page 19 Mounting the positioner Type 3372 Actuator with Type 3725 10 15 1 2 3 Positioner (direct attachment) Ansicht A SUPPLY 12.1 12.2 M lever Disk spring Follower pin Follower clamp Cover Connection block Ansicht A 12.1 Screw 12.2 Stopper or connection for external piping Formed seal Gasket Fig. 7: Direct attachment · Signal pressure connection for Type 3277 Actuator with 240 to 700 cm²...

  • Page 20: Attachment According To Iec 60534-6

    Mounting the positioner 4.4 Attachment according to the slot of the follower plate (3). Adjust the lever (1) correspondingly. IEC 60534-6 Fasten the positioner to the NAMUR The positioner is attached to the control valve bracket using its two mounting screws. using a NAMUR bracket (10). Î Required mounting parts and accesso- ries: Table 5 on page 31. Î Observe travel tables on page 13. 1. Screw the two bolts (14) to the bracket (9.1) of the stem connector (9), place the follower plate (3) on top and use the screws (14.1) for fastening. 2. Fasten the NAMUR bracket (10) to the control valve. − For valve with NAMUR rib: Fasten the NAMUR bracket (10) using the M8 screw (11) and toothed lock washer di- rectly to the yoke hole. −...
  • Page 21 Mounting the positioner Attachment to rod-type yoke 20 to 35 mm rod diameter Lever 14.1 Disk spring Follower pin Follower plate Connecting plate Seals Pressure gauge bracket Pressure gauge Stem connector Bracket NAMUR bracket Screw Bolt 14.1 Screws Travel indicator scale Clamp Fig. 8: Attachment according to IEC 60534-6 EB 8394 EN...

  • Page 22: Attachment To Type 3372 Actuator (V2001)

    Mounting the positioner 4.5 Attachment to Type 3372 Actuator (V2001) The Type 3725 Positioner is already included in the scope of delivery for Series V2001 Valves (Fig. 9). The attachment is briefly described below to allow conversion work to be performed. Actuator with 120/350 cm², stem extends The signal pressure is routed through the cor- responding port in the support element to the actuator diaphragm. Î Thread the screw plug on the positioner into the hole below (park position) (see Fig. 6 on page 17).
  • Page 23 Mounting the positioner Type 3372 Actuator, version with 120 cm² Type 3372 Actuator, version with 350 cm² Fig. 9: Mounting on Type 3372 Actuator EB 8394 EN...

  • Page 24: Attachment To Rotary Actuators

    The positioner is mounted to the rotary actu- adjust lever (1) so that it engages in the ator using a mounting bracket. slot of the coupling wheel (4) with its fol- lower pin (Fig. 11). Î Required mounting parts and accesso- Î The lever (1) must be parallel to the long ries: Table 6 on page 32. side of the positioner when the actuator Î Before attaching the positioner onto the is at half its angle of rotation. SAMSON Type 3278 Rotary Actuator 8. Stick the scale plate on the coupling (160 cm²) or VETEC Type S160 Actuator, wheel (4) so that the arrow tip indicates first mount the adapter (13) to the free the closed position and it can be easily end of the shaft end using four screws read when the valve is installed. (10, 1). 1. Place follower clamp (3) on the slotted actuator shaft or adapter (13).
  • Page 25 Mounting the positioner Lever Connecting plate 6.1 Seals Disk spring Pressure gauge bracket Follower pin Pressure gauge Follower clamp mounting kit Coupling wheel 10 Mounting bracket Screw 10.1Screws Disk spring 13 Adapter Actuator shaft 10.1 10.1 10.1 Attachment to SAMSON Type 3278 Attachment according to VDI/ Rotary Actuator (160 cm²) or VETEC VDE 3845, level 1 Type S160 Actuator Fig. 11: Attachment to rotary actuators EB 8394 EN...

  • Page 26: Heavy-Duty Version

    300 cm³, fit the restriction (order no. 1. Mount the housing (10) onto the rotary 1400-6964) into the signal pressure out- actuator. In case of VDI/VDE attachment, put of the positioner (or the output of the place spacers (11) underneath, if neces- pressure gauge bracket or connecting plate). sary. 2. For SAMSON Type 3278 and VETEC 8. Fasten the positioner onto the adapter S160 Rotary Actuators, screw the adapt- plate (12). er (5) onto the free end of the shaft or 9. Place the positioner together with the place adapter (5.1) onto the shaft of the adapter plate on the housing (10) and VETEC R Actuator. Place adapter (3) on- screw it tight. Taking the actuator's direc-...
  • Page 27 10.1 Screws Adhesive label Distance piece Actuator shaft or adapter Adapter plate 10.1 10.1 SAMSON Type 3278 Attachment according to VDI/VDE 3845 VETEC S160, VETEC R (Sept. 2010) fixing level 1, AA1 to AA4 size, see section 12.1 Fig. 13: Attachment to rotary actuators (heavy-duty version) EB 8394 EN...

  • Page 28: Mounting The Type 3710 Reversing Amplifier

    Mounting the positioner 4.6.1 Mounting the Type 3710 Reversing Amplifier When a Type 3710 Reversing Amplifier is used, a connecting plate is placed between the positioner and reversing amplifier. The reversing amplifier is fastened together with the connecting plate to the positioner using screws (Fig. 14). Note:  The screws supplied with the connect- ing plate have a TORX PLUS profile ® (size 25 IP) and must be tightened using a suitable tool.

  • Page 29: Accessories And Mounting Parts

    Mounting the positioner 4.7 Accessories and mounting parts Table 2: Direct attachment to Type 3277-5 and Type 2780-2 Actuators (see Order no. section 4.3) Mounting parts For actuators up to 120 cm² 1402-0239 Accessories for actuator Switchover plate for Type 3277-5xxxxxx.01 Actuator 1400-6822 Connecting plate for additional attachment of, e.g. a solenoid valve: G 1400-6823 Accessories for positioner G ¼ 1402-0235 Connecting plate (6) ¼ NPT 1402-0236 G ¼ 1402-0237 Pressure gauge bracket (7) ¼ NPT...
  • Page 30 Mounting the positioner Table 4: Pipe connections for Type 3277 (direct attachment) Pipe connection Actuator size Material Connection Order no. G ¼ / G  1402-0930 Steel ¼ NPT/  NPT 1402-0958 175 cm² G ¼ / G  1402-0950 Stainless steel ¼ NPT/  NPT 1402-0964 G ¼ / G  1402-0927 Steel ¼ NPT/  NPT 1402-0959 240 cm²...
  • Page 31 Mounting the positioner Order no. Table 5: Attachment to NAMUR rib or attachment to rod-type yokes according to IEC 60534-6 (section 4.4) 5 to 50 mm travel, lever already on positioner For actuators 1402-0330 Actuators from other manufacturers and Type 3271 with 120 to 700 cm² effective areas Accessories G ¼ 1402-0235 Connecting plate ¼ NPT 1402-0236 G ¼ 1402-0237 Pressure gauge bracket ¼ NPT 1402-0238...
  • Page 32 Mounting the positioner Order no. Table 6: Attachment to rotary actuators (section 4.6) Light version VDI/VDE 3845, AA1 size, level 1 1402-0243 VDI/VDE 3845, AA2 size, level 1 1402-0244 VETEC Type S160 Actuator or SAMSON Type 3278 Rotary Actuator (160 cm²) 1402-0294 VETEC Type S320 1402-0295 Heavy-duty version VDI/VDE 3845, AA1 to AA4 size, level 1 1402-1097 VDI/VDE 3845, AA1 to AA4 size, level 2 1402-1099 VETEC Type S160/R 1402-1098 Accessories G ¼ 1402-0235 Connecting plate ¼ NPT 1402-0236 G ¼ 1402-0237 Pressure gauge bracket ¼ NPT...
  • Page 33 Mounting the positioner Order no. Table 7: General accessories Cable gland M20x1.5 Black plastic 8808-1011 Blue plastic 8808-1012 Nickel-plated brass 1890-4875 Stainless steel 1.4305 8808-0160 Adapter M20x1.5 to ½ NPT Powder-coated aluminum 0310-2149 Stainless steel 1400-7114 Brief instructions inside cover German 0190-6173 English 0190-6174 EB 8394 EN...

  • Page 34: Connections

    Connections 5 Connections For rotary actuators, the manufacturer's specifications for connection apply. 5.1 Pneumatic connections Tip: To monitor the supply air (supply) The pneumatic connections are optionally and signal pressure (output), we rec- designed as a bore with ¼ NPT or G ¼ ommend mounting pressure gauges thread. The customary fittings for metal and (see accessories in section 4.7). copper pipes or plastic hoses can be used. Points that apply concerning the pneumatic 5.1.1 Supply pressure...

  • Page 35: Electrical Connections

    Connections 5.2 Electrical connections Supply pressure for fail-open valves (for globe and angle valves): Î For tight-closing valves, the maximum DANGER! signal pressure pst is roughly estimat- Risk of electric shock and/or the for- ed as follows: mation of an explosive atmosphere. − For electrical installation in hazard- d² · π · ∆p = F + [bar]...

  • Page 36: Electric Power Supply

    Connections 5.2.1 Electric power supply 5.2.3 Equipment for use in zone 2 Î Only use a current source and never a voltage source! Î In equipment operated with type of pro- Î Keep the reference variable within the tection Ex nA (non-sparking equipment) static destruction limit of ±33 V. according to EN 60079-15, only con- nect, isolate or switch circuits while ener- 5.2.2 Selecting cables and gized during installation, maintenance or repair. wires 5.2.4 Cable entry Î Observe EN 60079-14 and particularly Clause 12 in it when installing intrinsical- The M20x1.5 cable gland is designed for a ly safe circuits. clamping range of 6 to 12 mm. The Subclause 12.2.2.7 applies when running multi-core cables containing The cage clamp terminals hold wire...
  • Page 37 Connections Plastic part Terminal assignment for mA control signal: Fig. 15: Electrical connections EB 8394 EN...

  • Page 38: Operation

    Operation 6 Operation 6.1 Operating controls Three capacitive keys are used to operate the positioner and allow the user to navigate with- in the menu on the display (Fig. 16). Additionally, the volume restriction allows the air output capacity to be adapted to the size of the actuator. 6.1.1 Capacitive keys : Up : Confirm : Down Touch key to select a parameter code (P0 to P20). Then touch key to confirm the selected code. To save changes to parameters in a non-volatile memory, proceed as follows: Î After changing parameters, press to change to Code P0 or Î wait three minutes until the display returns automatically to P0. Note: ...

  • Page 39: Display

    Operation 6.1.3 Display Icons which are assigned to certain codes and functions are indicated on the display (Fig. 16). The bar elements indicate the system deviation that depends on the sign (+/–) and the value. One bar element appears per 1 % system deviation. If the positioner has not yet been initialized, the lever position in degrees in relation to the mid-axis is indicated. One bar element corresponds to approximately a 7° angle of rotation. If the fault indication icon is displayed, press until ERR is displayed to view the E0 to E15 error codes (see section 9.2). Confirm Down Operation locked Settings not yet saved in a non-volatile memory Fail-safe position active Unit Bar graph for system deviation Fault Parameter/error code Manual mode Reading Meaning Closed-loop control Stop...

  • Page 40: Start-Up

    Start-up 7 Start-up Before start-up, mount the positioner following the sequence described in section 4.1. Apply the electric reference variable to start up the positioner. Refer to section 5.2. Note:  − LOW on the display indicates that the reference variable is lower than 3.8 mA. − The positioner is ready for operation with its default settings for most applications. − Immediately after connecting the power supply, the capacitive keys are automati- cally calibrated.

  • Page 41: Settings

    Settings 8 Settings 8.1 Adapting the display The display reading direction can be rotated by 180°. If the displayed data appear upside down, proceed as follows: 1. Touch until Code P1 appears. to confirm the selected code. P1 blinks. 2. Press 3. Touch until the display is set in the desired direction. 4. Press to confirm display direction. 8.2 Enabling configuration to change parameters Before changing parameter settings in an initialized positioner, configuration must be en- abled first by selecting Code P19:...

  • Page 42: Adjusting The Volume Restriction Q

    Settings 8.3 Adjusting the volume restriction Q The volume restriction Q (see Fig. 17) serves to adapt the air output capacity to the size of the actuator: Actuators with a transit time < 1 s, e.g. linear actuators with an effective area smaller than 240 cm², require a restricted air flow rate. Setting to MIN Actuators with a transit time ≥ 1 s do not require the air flow rate to be restricted. Setting to MAX Additional points that apply concerning the volume restriction: Î Intermediate settings are not permitted. Î Re-initialize positioner after changing the volume restriction setting. Volume restriction Fig. 17: Volume restriction Q (MAX/MIN setting) EB 8394 EN...

  • Page 43: Entering The Direction Of Action

    Settings 8.4 Entering the direction of action − ATO (air to open) applies to a valve opening as the signal pressure increases. − ATC (air to close) applies to a valve closing as the signal pressure increases. The signal pressure is the pneumatic pressure at the output of the positioner applied to the actuator. Default direction of action: ATO Change the direction of action (enable configuration as described in section 8.2): 1. Touch until Code P2 appears. to confirm selected code. P2 blinks. 2.

  • Page 44: Limiting The Signal Pressure

    Settings The following correlation applies: Valve CLOSED OPEN Reading 100 % Direction of action increasing/increasing 20 mA 4 mA (>>) Direction of action increasing/decreasing 4 mA 20 mA (<>) 8.6 Limiting the signal pressure If the maximum actuator force is too high for the valve used, the signal pressure limit can be activated in Code P9. The pressure is then limited to approx. 2.3 bar. Activate the signal pressure limitation (enable configuration as de- scribed in section 8.2): 5. Touch until Code P9 appears. to confirm selected code.

  • Page 45: Initialization

    Settings Parameter codes [default settings] w/x direction of action [>>] RST Reset Gain Kp [50] Enable configuration Pressure limitation 2.3 bar [OFF] Firmware version End position w < [ON] Positioner needs to be re-initialized after changing the parameter setting 8.8 Initialization During initialization the positioner adapts itself optimally to the friction conditions and the signal pressure required by the control valve. WARNING! Risk of injury due to the actuator stem extending or retracting. Do not touch or block the actuator stem. NOTICE The process is disturbed by the movement of the actuator stem.

  • Page 46: Canceling Initialization

    Settings until Code P15 appears. 9. Touch 10. Press and hold for six seconds. 6...5...4...3...2...1 is counted down on the display. The initialization starts and INIT blinks. The time required for the ini- tialization procedure depends on the actuator transit time and can take a few minutes.

  • Page 47: Zero Calibration

    Settings 8.9 Zero calibration In case of inconsistencies in the closing position of the valve, e.g. with soft-seated plugs, it might be necessary to recalibrate zero over Code P16 (enable configuration as described in section 8.2). Start the zero calibration by activating Code P16 as follows: 11. Touch until Code P16 appears. 12. Press and hold for six seconds. 6...5...4...3...2...1 is counted down on the display. Zero calibration starts, ZERO blinks on the display. The time required for the initialization procedure depends on the ac- tuator transit time and can take a few minutes.
  • Page 48 Settings Enable configuration as described in section 8.2. 13. Touch until Code P17 appears. 14. Press and hold for six seconds. 6-5-4-3-2-1- is counted down on the display and P17 blinks. The manual set point is indicated on the display of an initialized positioner.

  • Page 49: Reset

    Settings 8.11 Reset A reset causes an initialization to be undone and all parameters settings are reset to the de- fault settings (see code list in section 9). Enable configuration as described in section 8.2. 16. Touch until Code P18 appears. 17. Press and hold for six seconds. 6...5...4...3...2...1 is counted down on the display. RST blinks while is pressed. As soon as the key is released, the reset process is completed and the display returns to status indication (P0).

  • Page 50: Resetting Error Codes

    Settings E6 error code: Rated travel not achieved The nominal range (Code P4) must be changed and the positioner re-initialized to remedy this problem. 8.12.1 Resetting error codes The E0 and E8 error codes can be reset as follows: 18. Touch to select the error code. to confirm the error code. ESC is displayed and the er- 19. Touch ror code blinks. until RST appears. 20.

  • Page 51: Code List

    Code list 9 Code list 9.1 Parameter codes Code Display, values Description [default setting] Note: Codes marked by an asterisk (*) indicate that the positioner needs to be re-initialized after- wards Status reading with The reading indicates the valve position or angle of rotation in % basic information when the positioner is initialized. On touching when the positioner is not initialized, the position of the lever in relation to the mid-axis is displayed. Reading direction The reading direction of the display is turned by 180°. ATO/ATC Parameter to adapt the positioner to how the control valve functions: [ATO] ATO: Air to open (valve CLOSED in fail-safe position) ATC: Air to close (valve OPEN in fail-safe position) Pin position Insert follower pin in the proper position depending on the valve 17/25/[35]/50/90° travel/opening angle (select according to travel tables on page 13). Nominal range Firmware 1.03 and lower: [MAX]...
  • Page 52 Code list Characteristic Select characteristic: 0 to 8 0, 1, 2 for globe valves, 0 to 8 with rotary actuators (P3 = 90°) Linear Equal percentage Reverse equal percentage SAMSON butterfly valve, linear SAMSON butterfly valve, equal percentage VETEC rotary plug valve, linear VETEC rotary plug valve, equal percentage Segmented ball valve, linear Segmented ball valve, equal percentage Reference variable For split-range operation: SRLO: low range 4 to 11.9 mA [4 to 20  mA] SRLO/SRHI SRHI: high range 12.1 to 20 mA Direction of action of the reference variable w to the travel/rota- [>>]/<> tional angle x (increasing/increasing or increasing/decreasing) Gain K On initializing the positioner, the gain is set to the selected value. 30/[50] If the positioner hunts, the K value can be reduced. Pressure limitation The signal pressure can take on the same pressure as the supply air ON/[OFF] at the maximum [OFF] or, in the case that the maximum actuator force can damage the valve, the pressure is limited to approx.
  • Page 53 Code list Press button to cancel the initialization process. As a result, the Start initialization valve moves to the fail-safe position. After a power supply failure during initialization, the positioner starts with the values of the last initialization (if available). The zero calibration process can be interrupted by touching Start zero calibration The control valve returns to closed-loop operation. Note: A zero calibration cannot be started when E1 error code ex- ists. After a power supply failure during zero calibration, the positioner starts with the settings from the last zero calibration. Manual mode Press to enter the set point. Reset Parameters are reset to their default setting.

  • Page 54: Error Codes

    Code list 9.2 Error codes In case of a fault, the fault indication icon is displayed. The errors listed in the following table are assigned to error classes: Error class 1: No operation possible Error class 2: Manual operation only possible Error class 3: Manual operation and closed-loop control possible Code Description Class Zero error Only with tight-closing function P10 (end position w < set (operational error) to ON). The zero point has shifted by more than 5 % compared to initialization. The error may arise when the valve seat trim is worn.
  • Page 55 Re-initialize the positioner. Travel is not achieved Supply pressure is too low, actuator leaks, incorrect travel during initialization adjusted or pressure limit function activated. (initialization error) Recommended action Check supply air, positioner mounting and setting. Re-initialize the positioner. Actuator does not move No supply air, mounting blocked. (initialization error) Recommended action Check supply air, positioner mounting and mA input signal. Re-initialize the positioner. Travel signal at lower/ Wrong pin position, wrong lever, wrong attachment direc- upper limit tion when NAMUR attachment is used. Recommended action Reset error code (see section 8.12.1). Check positioner mounting and re-initialize the positioner. Device error (internal) Return positioner to SAMSON AG for repair. EB 8394 EN...

  • Page 56: Maintenance

    Maintenance 10 Maintenance The positioner does not require any maintenance. There are filters with a 100 µm mesh size in the pneumatic connections for supply and output which can be removed and cleaned, if required. Î Observe the maintenance instructions of any upstream supply air pressure reducing sta- tions. 11 Servicing explosion-protected devices If a part of the device on which the explosion protection is based needs to be serviced, the device must not be put back into operation until an approved notified body or a qualified in- spector has assessed it according to explosion protection requirements, has issued an inspec- tion certificate or given the device a mark of conformity. Inspection by an approved notified body or a qualified inspector is not required if the manu- facturer performs a routine test on the device before putting it back into operation. The pass- ing of the routine test must be documented by attaching a mark of conformity to the device. Replace explosion-protected components only by original, routine-tested components provid- ed by the manufacturer. Note:  Devices that have already been used outside hazardous areas and are intended for future use inside hazardous areas must comply with the safety requirements placed on serviced devices.

  • Page 57: Dimensions In Mm

    Dimensions in mm 12 Dimensions in mm M20 x 1.5 62,50 Fig. 18: Dimensional drawings for Type 3725 Positioner EB 8394 EN...

  • Page 58: Fixing Levels According To Vdi/Vde 3845 (September 2010)

    Dimensions in mm 12.1 Fixing levels according to VDI/VDE 3845 (September 2010) Fixing level 2 (bracket surface) Fixing level 1 (actuator surface) Actuator Dimensions in mm Size Ød ØD 5.5 for M5 5.5 for M5 5.5 for M5 ØD 5.5 for M5 5.5 for M5 6.5 for M6 Flange type F05 acc. to DIN EN ISO 5211 EB 8394 EN...
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  • Page 68 SAMSON AG · MESS- UND REGELTECHNIK Weismüllerstraße 3 · 60314 Frankfurt am Main, Germany Phone: +49 69 4009-0 · Fax: +49 69 4009-1507 EB 8394 EN samson@samson.de · www.samson.de...

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