Table of Contents
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Table of Contents
Related Manuals for Fisher 3720
Summarization of Contents
Mounting the Positioner
Mounting, Actuator Types
Positioner mounting to various Fisher Controls actuator cover plates, specifying requirements.
Replacing An Existing Type 3610 Positioner
Procedure for replacing a Type 3610 positioner with a new one.
Cover Plate Orientation
Guidelines for orienting the actuator cover plate for positioner mounting.
Positioner Mounting Alignment
Ensuring proper alignment of the positioner mounting plate to the actuator cover plate.
Connections
Supply Connection
Details on connecting the clean, dry, oil-free air supply to the positioner.
Output Connections
Description of output connections for diaphragm and piston rotary actuators.
Instrument Connection
Connecting the instrument signal to the positioner.
Vent Opening, Purge Option, and Actuator Vent Connection
Information on vent openings, purge options, and actuator vent connections.
Calibration
Setting the Initial Cam Position
Procedure for setting the initial cam position relative to the valve position.
Zero and Span Adjustments
Instructions for adjusting the zero and span of the positioner for accurate control.
Standard or Beacon Indicator Alignment
Steps to align the positioner's valve position indicator accurately.
Changing Positioner Action
Single-Action/Double-Action
Configuring the positioner for single- or double-action output to the actuator.
Direct-Action/Reverse-Action
Explanation and procedure for changing the positioner's action from direct to reverse.
Positioner Maintenance
Replacing the Standard or Beacon Indicator
Procedure for replacing the positioner's visual valve position indicator.
Removing the Type 3722 Converter
Step-by-step guide for safely removing the Type 3722 electro-pneumatic converter.
Removing the Positioner
Instructions for removing the positioner unit from the actuator.
Removing the Feedback Arm Assembly
Procedure for removing the feedback arm assembly from the positioner.
Disassembling the Feedback Arm Assembly and Span Adjuster Assembly
Detailed steps for taking apart the feedback arm and span adjuster assemblies.
Removing the Feedback Shaft (Cam Shaft)
Guide for removing the feedback shaft, also known as the cam shaft.
Disassembling the Spool Valve, Action Block, and Gasket
Procedure for disassembling the spool valve, action block, and gasket components.
Disassembling the Input Module and Summing Beam Assembly
Instructions for taking apart the input module and summing beam assembly.
Replacing the Input Module Diaphragm
Steps for replacing the diaphragm within the input module assembly.
Assembling the Input Module and Summing Beam Assembly
Procedure for correctly assembling the input module and summing beam assembly.
Parts Ordering
Parts Kits
List of available parts kits for pneumatic positioners and converters.
Parts List
Comprehensive list of individual parts with part numbers and quantities.
Positioner Common Parts
Common parts applicable to positioners as shown in Figure 26.
Diagnostic Connections
For Type 3710 Positioner
Diagnostic connection details specific to Type 3710 pneumatic positioners.
For Type 3720 Positioner
Diagnostic connection details specific to Type 3720 electro-pneumatic positioners.
Errata: Specific Actuator Installation
Installing Positioner on Specific Actuators
Procedure for installing positioners on Type 585 and 585R actuators, as per errata sheet.
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