Flowserve Logix 3000MD Series User Manual

Logix 3000MD Series Digital Positioner FCD LGENTB0059-01 – 10/09
3
Sensor
-
+
+
+
+
Summer
Integration
I
Offset
Loop
Inner
+
-
Gmult
Pmin
Pmax
Deviation
F
OUNDATION
Fieldbus
Signal
Command In
(AO Block)
F
OUNDATION
Fieldbus
Transducer
Block
CONTROL
COMMAND
Output
D/A
Percentage
Algorithm
Control
Supply
Air
Control
Spool
Loop
Inner
ATO
Tubed
Sensor
Position
Stem
Voltage
Valve
Piezo
MPC
Soft Limits
Characterization
Linear Mode
Output
Inner-Loop
OR
Command In
(Digital Mode)
4-20
M A
(A NALOG
MODE )
Input
Signal
A
NALOG
D IGITAL
Logix 3200MD
Logix 3400MD
Figure 1: System Positioning Algorithm for Logix 3400MDDigital Positioners
O O
Stem
Position
Sensor
Piezo Valve
Output 2
Output 1
Hall Effect
Sensor
Flame
Arrestor
Exhaust
Spool Valve
Flame
Arrestor
Pressure
Sensor Board
Air Supply
Main PCB
Regulator
Filter
Flame
Arrestor
Digital Position Algorithm
LED
Display
FF/HART
Input Signal
Figure 1: Logix 3000 Series
Digital Positioners Schematic
(air-to-open configuration)
Logix 3000MD Positioner Overview
The Logix 3000MD Series Digital Positioner - How It Works
Tu n i n g
Unlike other positioners that have only one set gains to set the response of the positioner, the Logix 3200MD positioner
uses a multi-variable variable gain tuning algorithm. This allows the positioner to make large step changes with minimal
overshoot, while achieving the resolution to respond to very small step changes.
The Auto Tune procedure cycles the actuator to produce a measured response and selects those gain values that provide
appropriate actuator performance. The Auto Tune function includes a gain modifier selector that can be used to increase or
decrease the calculated gain in order to achieve optimal performance.
By setting the Auto Tune on/off DIP switch, the tuning mode can be changed from auto to manual. The Logix 3000MD Series
positioners provide several preset gain settings with a locally adjustable gain set selector directly from the user interface on
the positioner. If custom settings are desired, tuning sets can be modified with a handheld or ValveSight, to accomodate a
wide range of actuator sizes and types.

Flowserve Logix 3000MD Series Specifications

General

Brand	Flowserve
Model	Logix 3000MD Series
Category	Valve Positioners
Language	English