Fisher 3570 User Manual

www.Fisher.com
Fisher
r
3570 Pneumatic Valve Positioners
Contents
Introduction 1.................................
Scope of Manual 1.............................
Description 2.................................
Valve Positioner Type Numbers 2.............
Specifications 4...............................
Educational Services 4.........................
Installation, Mounting, and Connections 5..........
Installation 5.................................
Diagnostic Test Connections (Optional) 6.....
Connections 7................................
Piping Sizes 7.............................
Vent 8...................................
Supply Pressure Connections 9..............
Cylinder Connections 10....................
Instrument Connection 10..................
Operating Information 11........................
Initial Adjustments 11..........................
Adjustment Procedures 11......................
Changing Positioner Action 12..................
Split Range Operation 15.......................
Initial Range Spring Extension Procedure
for 3570P and 3570PC Positioners 15..........
Principle of Operation 17........................
3570, 3570C, 3570P, 3570PC, and
3571 Valve Positioners 17....................
3572 and 3576 Valve Positioners 18..............
3573 and 3577 Valve Positioners 19..............
Relay Operation 20............................
Maintenance 21................................
Troubleshooting 22............................
Converting a 3570 Valve Positioner to a
3570C Valve Positioner 23....................
Range Spring 24..............................
Disassembly 24............................
Assembly 24..............................
Figure 1. Fisher 3570 Positioner Mounted on
470 Actuator
W5566
Bias Spring 25................................
Disassembly 25............................
Assembly 25..............................
Parts Ordering 25...............................
Parts Kits 26...................................
Positioner Repair Kits 26........................
Diagnostic Test Connection Kits 26...............
Parts List 26...................................
Positioner Common Parts 26....................
Introduction
Scope of Manual
This manual provides installation, operation, adjustment, maintenance, and parts ordering information for Fisher
3570 pneumatic valve positioners. The various product types within this series are described later in this manual. Refer
Instruction Manual
D200137X012
3570 Positioners
September 2015

Fisher 3570 Specifications

General

Manufacturer	Fisher
Category	Controller
Accuracy	±1% of span
Ambient Temperature Range	-40 to 180°F (-40 to 82°C)
Supply Pressure	20 psi (1.4 bar)
Materials	Aluminum, Stainless Steel

Summary

Introduction

Scope of Manual

Outlines the manual's content and purpose for the Fisher 3570 positioner.

Description

Valve Positioner Type Numbers

Details the various models within the Fisher 3570 series, including their specific features.

Specifications

Available Configurations

Lists the different configuration options and specifications available for the 3570 positioners.

Installation and Connections

Installation

Provides instructions for physically mounting and installing the positioner unit.

Diagnostic Test Connectors

Information on optional connectors for diagnostic testing.

Piping Sizes

Specifies the required pipe and tubing diameters for all positioner connections.

Vent and Pressure Connections

Vent

Safety and operational guidelines for venting the positioner assembly.

Supply Pressure Connections

Instructions for connecting the supply air or gas medium to the positioner.

Cylinder Connections

Information on connecting the positioner's output to the actuator cylinder.

Instrument Connection

Guidance on connecting the pneumatic input signal to the positioner.

Operation and Adjustment

Initial Adjustments

Steps for setting up the positioner upon initial installation or after service.

Adjustment Procedures

Detailed steps for calibrating and adjusting the positioner's performance.

Changing Positioner Action

Procedures for reconfiguring the positioner for direct or reverse action.

Split Range Operation

Instructions for operating the positioner with two control valves.

Initial Range Spring Extension Procedures

Specific steps for range spring extension on certain models.

Principle of Operation

3570, 3570C, 3570P, 3570PC, and 3571 Valve Positioners

Explains the functional mechanism of the positioner across different models.

3572 and 3576 Valve Positioners

Explains the functional mechanism of the positioner across different models.

3573 and 3577 Valve Positioners

Explains the functional mechanism of the positioner across different models.

Relay Operation

Details the internal workings and function of the positioner's relays.

Maintenance and Troubleshooting

Maintenance

General procedures for inspecting and maintaining the positioner.

Troubleshooting

Guidance on diagnosing and resolving common positioner issues.

Parts and Service

Conversion Procedures

Steps for converting positioner types.

Spring Replacement

Steps for disassembling and assembling range and bias springs.

Parts Ordering

Information on ordering specific parts and available repair kits.