Section 2 - Description And Operation; Introduction; Type Av3/4 Positioner Operation Diagram; Block Diagram Of A Typical Control System Utilizing A Positioner - ABB AV3 Instruction Manual

INTRODUCTION

SE T +
PO IN T
Figure 2-2. Block Diagram of a Typical Control System Utilizing a Positioner
I-P88-24A1

SECTION 2 - DESCRIPTION AND OPERATION

This section describes and explains the functional and physical
operation of Type AV3 and AV4 positioners. Figure
operating principles of the positioners. Figure
placement of a Type AV positioner in a typical system.
PILOT VA LV E
TO AC T UATO R
SU PP LY P R ES S U R E
TO AC T UATO R
Figure 2-1. Type AV3/4 Positioner Operation Diagram
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C O N T RO LLE R
– –
PO S IT IO N
T R AN S M IT T ER
(O P T IO N AL)
S IG N A L
D IA PH R A G M
C A M
O 1
S
O 2
PO S IT IO N E R AC TUATO R
LIN K AG E
P RO C ES S FE E D B A C K
2-1
2-2 shows the
SIGN A L P R ES SU R E
3-15 PSIG
D IA P H R A G M
F O R C E
BA LA N C E B E A M
G A IN
H IN G E
S P R IN G
R A N GE
EM I/E L EC TR O N IC S
S P R IN G
A N D
F O R C E
SE R VO
AS SE M B LY
4-20 m A
O R
PU LSE SIG N A L
R A N G E SP R IN G
LO A D
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PR O C ES S
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INTRODUCTION
diagrams
T 02 0 00 A
O U T P U T
T 00 7 70 A
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