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Fisher 3710 Instruction Manual

Pneumatic positioners and converter
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Instruction Manual
Form 5300
July 1993
Types 3710, 3720 Pneumatic Positioners
Type 3722 Converter
Incorporates Errata dated August 1994; see page 42
Incorporates Loop Schematics dated December 1994
W6144/IL
Types 3710, 3720, 3722
SUPPLY
CONNECTION
W6058-1/IL
Figure 1. Positioners

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  • Page 1 Instruction Manual Form 5300 Types 3710, 3720, 3722 July 1993 Types 3710, 3720 Pneumatic Positioners Type 3722 Converter Incorporates Errata dated August 1994; see page 42 Incorporates Loop Schematics dated December 1994 SUPPLY CONNECTION W6144/IL W6058-1/IL Figure 1. Positioners...

  • Page 2: Table Of Contents

    Standard or Beacon Indicator Alignment ..tion for the Type 3710 pneumatic positioner and Type 3720 electro-pneumatic positioner. This manual also Changing Positioner Action ...

  • Page 3: Type Number Description

    Use this unit in combination control signal to the actuator. Be sure with a Type 3710 positioner to make a Type 3720 po- the actuator cannot suddenly open or sitioner.
  • Page 4 3. Scfh — standard cubic feet per hour (60 F and 14.7 psia). Normal cubic meters per hour (0 C and 1.01325 bar absolute). 4. Typical valves tested using a Fisher Controls Type 1061 size 30 actuator at 60 psig (4.1 bar) supply pressure. Performance may vary with other actuator types and supply pressures.
  • Page 5 Fisher Type 1066, sizes 20, 27, and 75 1. Includes purge tube option. 2. The size 30 actuator is no longer manufactured by Fisher Controls. The Types 3710, 3720 positioners are available for field installation on existing size 30 actuators. Use bypass valves or completely...

  • Page 6: Mounting The Positioner

    Types 3710, 3720, 3722 SUPPLY CONNECTION EXTERNAL GROUNDING SCREW W6145/IL Figure 3. T ype 3722 Electro-Pneumatic Converter 3. Locate the two socket head mounting screws (key WARNING 84). Properly orient the converter and secure it to the positioner base plate with the mounting screws. Be...
  • Page 7 Position the actuator cover plate so the The positioner mounts directly to the positioner mounting holes on the new actuator cover plate of several Fisher cover plate allow placement of the posi- Controls actuators. See table 3. To tioner in the desired orientation.
  • Page 8 Types 3710, 3720, 3722 42B8466-A/DOC 42B8466-A/DOC Figure 4. Typical Positioner/Actuator Combinations...
  • Page 9 Types 3710, 3720, 3722 W6147-1/IL W6146-1/IL Figure 5. Typical Piston Actuator (T ype 1061)

  • Page 10: Connections

    Types 3710, 3720, 3722 W5916/IL Figure 6. Loosening the Cam Locknut 5. If the specific actuator requires a positioner Connections mounting plate (key 43), install the mounting plate using the cap screws (key 45). WARNING 6. Unscrew the four captive cover screws and remove the cover assembly (key 7) from the positioner.

  • Page 11: Supply Connection

    Refer to the section on vent opening, purge op- cause a variety of problems in pneumat- tion, and actuator vent connection for instructions ic control operation, Fisher Controls has about a remote vent connection. no technical basis to recommend the...

  • Page 12: Output Connections

    A purge tube (key 58, figure 8) is available as an op- OUTPUT B to the upper actuator cylinder connection. tion when mounting the positioner on selected Fisher To retract the actuator stem with increasing instrument Controls actuators. One end of the purge tube with an input signal, connect OUTPUT A to the upper actuator O-ring (key 59) installs in the actuator cover plate.

  • Page 13: Connecting The Purge Tube

    When the positioner is secured to the actuator, install the vent screen. The positioner mounts directly to the actuator cover plate of Fisher Controls Types 1051, 1052, and 1061 3. Before mounting the positioner, be sure the second actuators. See table 3 for actuator sizes.

  • Page 14: Positioner

    For intrinsically-safe installations, refer to Fisher loop schematics or to instruc- tions provided by the barrier manufac- turer for proper wiring and installation. Use the 1/2-inch NPT (or M20 thread) conduit connec- tion for field wiring installation.
  • Page 15 Types 3710, 3720, 3722 13B8743-A B2414/IL 12B8055-A B2385/IL Figure 1 1. Diagnostic Connections...

  • Page 16: Calibration

    1. Unscrew the four captive cover screws (key 8) and remove the positioner cover assembly (key 7). The following calibration procedures are for Type 3710 pneumatic positioner adjustment. For the Type 3720 2. See figure 12. Inspect the cam (key 36) and loosen electro-pneumatic positioner, there are no adjustments the cam locknut (key 37).

  • Page 17: Zero And Span Adjustments

    3. Provide a way to check the input signal. Apply the minimum input signal. For example: See figure 14. For a Type 3710 pneumatic positioner, if the in- put signal range is 3 to 15 psig (0.2 to 1.0 bar), apply 1. To start this procedure, if necessary, unscrew the 3 psig (0.2 bar).

  • Page 18: Standard Or Beacon Indicator Alignment

    Types 3710, 3720, 3722 INDICATOR SCALE (KEY 14) FEEDBACK SHAFT INDICATOR (KEY 15) (CAM SHAFT) (KEY 38) NOTES: RETAINING RING (E-CLIP) (KEY 12) IS NOT SHOWN. THE SHAFT OF THE INDICATOR (KEY 15) PASSES THROUGH THE POSITIONER COVER AND FITS OVER THE END OF THE FEEDBACK SHAFT (CAM SHAFT) (KEY 38).

  • Page 19: Changing Positioner Action

    For Fisher Controls piston actuators, OUTPUT hold the beacon indicator (key 10) to the positioner A connects to the lower actuator cylinder connection cover.

  • Page 20: Split-Range Operation

    Types 3710, 3720, 3722 6 to 18 psig (0.4 to 1.2 bar) 18 to 30 psig (1.2 to 2.0 bar) 1. Turn off supply pressure. Remove the positioner cover assembly (key 7). 2. Loosen the cam locknut (key 37). Rotate the cam to the desired split-range value: either “0-50%”...

  • Page 21: Changing The Span Adjuster Assembly (To Change Positioner Input Range)

    Types 3710, 3720, 3722 Note Spool Valve Body, Spool Handle the spool valve body and spool with care. The body and spool are manufactured to precise tolerances and are prepared as a matched set. 2. Unscrew the two machine screws (key 3) that hold the spool valve (key 1) onto the action block (key 28).

  • Page 22: Principle Of Operation

    The sum- ming beam moves the spool down in the spool body, The Type 3710 pneumatic positioner accepts a opening output port B to supply air to the left side of pneumatic input signal and the Type 3720 the actuator.

  • Page 23: Positioner Maintenance

    Con- Due to the care Fisher Controls takes in meeting all nect pneumatic input and supply pressure to the posi- manufacturing requirements (heat treating, materials tioner, if necessary.
  • Page 24 Types 3710, 3720, 3722 W6149/IL W6148/IL Figure 19. Removing the Converter Mounting Screws...

  • Page 25: Removing The Feedback Arm Assembly

    Types 3710, 3720, 3722 2. Unscrew the four captive cover screws (key 8) and remove the positioner cover assembly (key 7). 3. Unscrew the three socket head screws (key 46) and remove the positioner. 4. Inspect the feedback tie bar (key 42) attached to the actuator hub.

  • Page 26: Removing The Feedback Shaft (Cam Shaft)

    Types 3710, 3720, 3722 SPOOL VALVE BODY SPOOL VALVE BODY SPOOL W5917*/IL Figure 21. Spool V alve Body and Spool 6. Be sure the cam roller (key 23) turns freely. If nec- Disassembling the Spool Valve, Action essary, remove the shoulder screw (key 24) and cam Block, and Gasket roller from the feedback arm and replace them.

  • Page 27: Disassembling The Input Module And Summing Beam Assembly

    Types 3710, 3720, 3722 W5913/IL Figure 22. Separating the Summing Beam Assembly from the Input Module Disassembling the Input Module and 4. See figure 22. Separate the summing beam as- sembly from the input module by removing one of the...

  • Page 28: Assembling The Input Module And Summing Beam Assembly

    Types 3710, 3720, 3722 W5915/IL Figure 23. Input Module Diaphragm and Diaphragm Housing 3. See figure 24. Position the new diaphragm (key 30B) between the diaphragm plates (key 30C). Be sure the diaphragm convolution is properly oriented between the diaphragm plates. Attach the diaphragm connector (key 30D) with the machine screw (key 30F).

  • Page 29: Assembling The Spool Valve, Action Block, And Gasket

    Types 3710, 3720, 3722 2. Install the machine screw (key 30E) that connects the summing beam flexure to the diaphragm connec- tor, taking care not to twist the diaphragm connector and diaphragm (key 30B). Use a wrench or other tool to hold the diaphragm connector while installing the machine screw.

  • Page 30: Replacing The Feedback Arm Assembly And Span Adjuster Assembly

    Types 3710, 3720, 3722 2. Properly install the flanged bearings in the position- Type 3722 Converter er base plate. Install the spacer on the feedback shaft. Maintenance Then, insert the shaft with spacer through the bearings and base plate. Make sure the feedback shaft rotates freely.

  • Page 31: Testing The Type 3722 Converter Module

    Parts Ordering 4. If the converter module was removed from the When corresponding with the Fisher sales office or housing, apply lubricant (key 82) to the O-ring sales representative about this equipment, be sure to (key 77) and insert the converter module into the mention the positioner serial number.
  • Page 32 Types 3710, 3720, 3722 42B7272 SHT 1 OF 3/DOC 42B7272 SHT 2 OF 3/DOC 42B7272 SHT 2 OF 3/DOC Figure 26. T ype 3710 Components and Subassemblies...
  • Page 33 Types 3710, 3720, 3722 42B7272 SHT 3 OF 3/DOC Figure 26. T ype 3710 Components and Subassemblies (Continued)
  • Page 34 Needle bearing is pressed into the feedback beacon indicator 1F6252X0012 arm (key 21). To install a new needle bearing, the existing bearing must be pressed out. Please consult your Fisher sales office or representative 12B7271X012 Washer (metric), S18800 (18-8 SST) 12B7299X012...

  • Page 35: Diagnostic Connections

    Types 3710, 3720, 3722 Description Part No. Qty Description Part No. Qty Diaphragm cover 22B7286X012 Street tee, qty 1, required to attach each Summing beam assy 22B7287X012 gauge or tire valve to pipe bushing (key 68) Steel, carbon steel, zn pl...

  • Page 36: Type 3722 Electro-Pneumatic Converter

    Types 3710, 3720, 3722 Figure 27. T ype 3722 Components and Subassemblies 34B0694-A/DOC Description Part No. Qty Description Part No. Qty For Type 3720 Positioner Type 3722 Electro-Pneumatic Converter (Figure 27) Single-action units For units w/gauges Housing, aluminum SST fittings...

  • Page 37: Positioner Mounting Parts

    * Recommended spare part. 5. Mark owned by Armite Laboratories. 6. Mark owned by Dow Corning Corp. 7. The size 30 actuator is no longer manufactured by Fisher Controls. The type 3710 positioner is available for field installation on existing size 30 actuators.
  • Page 38 Types 3710, 3720, 3722 13B8743-A B2414/IL 12B8055-A B2385/IL Figure 28. Diagnostic Connections...
  • Page 39 For 1032 sizes 2585, 4580 12B8499X012 Connector For 1066 size 27 1N822924092 Swivel * Recommended spare part. 7. The size 30 actuator is no longer manufactured by Fisher Controls. The Type 3710 positioner is available for field installation on existing size 30 actuators.
  • Page 40 Types 3710, 3720, 3722 42B8466-A/DOC 42B8484-A/DOC Figure 29. Positioner Mountings (Continued)
  • Page 41 Types 3710, 3720, 3722 32B8490-A/DOC 33B0322-B/DOC 33B0321-B/DOC Figure 29. Positioner Mountings (Continued)
  • Page 42 Types 3710, 3720, 3722 August 1994 Errata Sheet for Types 3710, 3720 Pneumatic Positioners and Type 3722 Converter Instruction Manual Form 5300, July 1993 1. On page 6 of the instruction manual, near the 3. Loosen eight screws, and remove the front and heading Mounting the Positioner, write a note that back yoke covers (keys 18 and 20).
  • Page 43 Types 3710, 3720, 3722 Figure 1. Typical T ype 3710 Positioner Mounted on a T ype 585 Actuator (key 93). The markings on the feedback lever should just the drive stud location vertically so that the feed- be visible when looking toward the back of the posi- back lever is perpendicular to the stem.
  • Page 44 Types 3710, 3720, 3722 Figure 2. Drive Stud and Roller Bearing Assembly Figure 4. Mounting Plate Positioned on Actuator Figure 3. Drive Stud Bracket with Drive Stud and Roller Bearing Assembly Figure 5. Positioning Drive Stud in Feedback Lever Parts List...
  • Page 45 December 1994, Form 5362 Type 3722 Electro-Pneumatic Converter Loop Schematics This document includes loop schematics required for wiring of intrinsically safe installations. If you have any questions, contact your Fisher Controls sales repre- sentative or sales office. CSA Schematics 24B0238-A/DOC...
  • Page 46 FM Schematics 24B0239-A/DOC Fisher, Fisher-Rosemount, and Managing The Process Better are marks owned by Fisher Controls International, Inc. or Fisher-Rosemount Systems, Inc. All other marks are the property of their respective owners. Fisher Controls International, Inc. 1991, 1993; All Rights Reserved...

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