Section 1 - Introduction; Introduction; Intended User; Type Av3/4 Positioner Description - ABB AV3 Instruction Manual

INTRODUCTION

INTENDED USER

TYPE AV3/4 POSITIONER DESCRIPTION

SECTION 1 - INTRODUCTION

This section covers the following topics:
Type AV3/4 description.
•
Type AV3/4 application.
•
Features of positioners.
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Instruction content.
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How to use this instruction book.
•
Type AV3/4 nomenclature.
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Type AV3/4 specification.
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Position transmitter specification.
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Agency approvals.

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Accessories.
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Mounting kits.
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NOTE: Appendix B provides a quick start guide for the Type AV
positioner. It is intended for control engineers having experience in
the use and application of pneumatic positioners. The quick start
guide highlights the major points of installation and calibration.
Detailed installation and calibration information is contained in
Section 3 and 4.
The information in this publication is a guide for technical person-
nel responsible for installation, calibration, operation, maintenance
and repair of the Type AV3/4 positioner.
The Type AV3 and Type AV4 positioners are electro-pneumatic
control devices that satisfy a wide range of applications. They pro-
vide fast, sensitive and accurate positioning of pneumatic single or
double acting actuators.
The Type AV3 positioner accepts a four to 20 milliamp current that
is applied to an I/P (current to pneumatic) converter (located
inside the housing) to generate an internal signal pressure. The
Type AV4 positioner responds to a solid state (DDC) or contact
closure input to generate a similar internal signal pressure.
If a loss of signal occurs, both Type AV3 and AV4 positioners
retain their position just prior to the signal loss (referred to as fail
in place).
INTRODUCTION
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