Flowserve Logix 1200e LGAIM0044 - Manual (Page 40)

44-40 Flowserve Corporation, Valtek Control Products, Tel. USA 801 489 8611
Advanced Features
Standard vs. Advanced Diagnostics
The Logix 1200 digital positioner is available with
either standard or advanced diagnostics. The model
with advanced diagnostics adds top, bottom and sup-
ply on more current models (Logix 1210e) the supply
sensor is not included, instead, supply is calculated
using the other pressure sensors. This allows for more
diagnostic calculations such as loss of pressure, fric-
tion, advanced signatures, and troubleshooting.
Frequently Asked Questions
Q: Can I upgrade from a model with standard diagnos-
tics to advanced diagnostics?
Answer: Yes, but only with the earlier model (the
model characterized by an oblong LED window). The
most current model (1200e, characterized by a round
LED window) cannot be upgraded. A new advanced
collector board assembly can be purchased. Simply
replace the standard collector board with the
advanced collector board. All connectors on the col-
lector board are keyed and unique for easy cable re-
connection. Using ValTalk or SoftTools software, or the
HART 275 handheld communicator, configure the
positioner for Advanced Diagnostics and perform an
actuator pressure calibration.
Temperature and Pressure Units
The desired temperature and pressure units can be
set during configuration. Once set, all readings will be
displayed in the desired units.
Stroke Length
Stroke length is used by the travel accumulator. When
the stroke length and units are set, the length is used
to determine the total travel accumulated. The travel
accumulator will have the units associated with stroke.
Example: Stroke length is set to 4.0 inches (10 cm). If
the valve is moved from 0 percent to 100 percent, 4
inches will be added to the travel accumulator. The
travel accumulator units will be inches. If stroke length
is 90 degrees for a rotary, the travel accumulator will
now have units of degree. A 0 percent to 100 percent
stroke will add 90 to the travel accumulator.
NOTE: Stroke length is not set or used during calibration.
Custom Characterization
Custom characterization can be thought of as a ‘soft
CAM.’ The user can define a characterization curve
using 21-points. The control will linearly interpolate
between points. Points do not have to be equally
spaced, which will allow more definition at critical
curve areas.
The Logix 1200 positioner has two modes: Linear and
Custom Characterization. Linear is a straight 1:1 map-
ping of command to control command and does not
use the 21-point curve definition. When Custom Char-
acterization is disabled, the positioner is automatically
in Linear mode. If custom characterization is enabled,
the Logix 1200 positioner uses the 21-point user
defined curve.
Frequently Asked Questions
Q: Is there a default custom characterization curve?
A: Yes. The Logix 1200 positioner comes with a fac-
tory default equal-percent curve as shown in Table III