Flowserve 420 IOM - Manual (Page 15)

User Instructions - Logix® 420 Series Digital Positioners FCD LGENIM0106-06 12/13
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15
8
STARTUP
8.1 Quick Start Instructions
Once installed, the DIP switch settings and Quick-Cal
function listed below are typically all that are needed to
calibrate and tune the positioner for use. This simple
procedure takes only seconds for most valves.
1 Using the Configuration Switches, select the desired
configuration. See section 8.3 Configuration Switch
Settings for details.
2
Hold the Quick-Cal button for 3 seconds. This will
initiate a stroke calibration. (LCD Screen must show
the main menu before pressing Quick-Cal button. See
Figure 9.)
After the stroke calibration is complete, the positioner is
ready for control.
CAUTION: During the QUICK-CAL operation the valve
may stroke unexpectedly. Notify proper personnel that the
valve will stroke, and make sure the valve is properly
isolated.
8.2 Local User Interface Overview
The Logix 420 local user interface allows the user to
calibrate, configure the basic operation, and tune the
response of the positioner without additional tools or
configurators. The Local interface consists of:

Configuration Switches (7) – Used to set basic
configuration. See explanations in section 8.3
Configuration Switch Settings.

Interface Buttons – Used to calibrate the positioner,
perform special functions and navigate the display
menu.
o
►QUICK-CAL / ACCEPT(Move Right)
o ▲Up
o ▼Down
o ◄Back (Move Left)

Selectable GAIN Switch (Rotary) – Used to manually
fine-tune the performance.

LED Indicators (Red, Yellow, and Green) – Indicate
status, alarms and warnings.

Display (Optional) – Provides a full menu of detailed
information and configuration.
8.3 Configuration Switch Settings
Before placing the unit in service, set the Configuration
Switches to the desired control options.
NOTE: The Configuration Switch settings are activated only
by performing a Stroke calibration (pressing the “QUICK-
CAL” button for 3 seconds). However, the Configuration
Switch settings may be edited from the DTM or Handheld at
any time.
8.3.1 Air Action Switch
This must be set to match the configuration of the
valve/actuator mechanical tubing connection since the tubing
determines the air action of the system.
ATO - Increasing pressure from the output port causes the
valve to open.
ATC - Increasing pressure the output port causes the valve
to close.
8.3.2 Signal at Closed Switch
Normally this will be set to 4 mA for an Air-To-Open actuator
configuration, and 20 mA for Air-To-Close.
4 mA - Selecting 4 mA will make the valve close when the
signal is low (4 mA) and open when the signal is high (20
mA).
20 mA - Selecting 20 mA will make the valve close when the
signal is high (20 mA) and open when the signal is low (4
mA).
NOTE: When using an Analog Output (AO) function of the
Multi-Function Card, the AO signal corresponds with the
Signal At Closed selection. If the valve closes with a 4 mA
signal, the AO will show a 4 mA signal at closed. If the valve
closes with a 20 mA signal, the AO will show a 20 mA signal
at closed.
8.3.3 Characterization Switch
The Characterization Switch allows a better match between
the input command and the actual fluid flow through the
valve. This feature is typically used with valves that have
non-linear flow characteristics. The positioner makes a
correction by applying an adjustment to the input command
according to a characterization curve.
Linear - Select Linear if the actuator position should be
directly proportional to the command input signal. (For most
rotary valves, this setting gives an =% Cv characteristic due
to their inherent =% characteristics.)
Other - Select Other if one of the pre-set characterization
curves or a custom curve is desired. The default will be the
Custom curve which is populated with a standard 30:1 equal
percent rangeability curve which generally opens less than
the input command. To select one of the other curve options,
use the LCD menu, a Handheld or the ValveSight DTM. To