Flowserve 400MD Logix - Manual (Page 93)

8. Carefully slide the block over the spool, using the machined surface of the housing base as a register. Slide the block toward the driver module until
the two retaining holes line up with the threaded holes in the base. If resistance is still encountered, re-clean both parts or replace the driver module
assembly. Refer to the IOM manual for spare part kit numbers.
Refer to the instructions in the Logix Series 3400MD Digital Positioner IOM under Driver Module Assembly for further instructions.
Advanced Features
Standard vs. Advanced Diagnostics
Answer: The model with advanced diagnostics adds top and bottom sensors. This allows for the collection of data for more diagnostic calculations, such as
loss of pressure, friction, advanced signatures, and troubleshooting.
Question: Can I upgrade from a standard to an advanced model?
Answer: Yes. Advanced pressure board assembly can be purchased (see IOM). Simply install the advanced pressure board. All connectors on the pressure
board are keyed and unique for easy cable re-connection. Using FB configurator, 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. Parameters TEMP_UNITS and PRESS_UNITS in the transducer block.
Stroke Length: Stroke length is used by the travel accumulator (TRAVEL_ENG). When the stroke length and units are set, the length is used to determine the
total travel accumulated. The travel accu mulator will have the units associated with stroke. Parameters STROKE_ENG and TRAVEL_UNITS in the transducer
block.
Example: Stroke length is set to 4 inches. 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 for information only.
Custom Characterization: Custom characterization can be thought of as a soft cam. The user can choose between an equal percentage, quick opening, or
custom user-defined characterization curve using 21-points. The control will linearly interpolate between points. Points do not have to be equally spaced
in order to allow more definition at critical curve areas.
The Logix 3400MD digital positioner has two modes: linear and characterization. Linear is a straight 1:1 mapping of command to control command. It
does not use the 21-point curve definition. When custom characterization is disabled, the positioner is automatically in linear mode. If custom charac-
terization is enabled, the Logix 3400MD digital positioner uses one of the 21-point user defined curves.
Question: Does a default custom characterization curve exist?
Answer: Yes. The Logix 3400MD digital positioner comes with a factory-default equal percent (and quick opening) curve in Figure 10.3.
NOTE: The quick opening curve is the inverse of the equal percent curve.
Table 10.14 Logix 3400MD Digital Positioner Characteristic Curves
FINAL_VALUE (%FS) Quick Open
CMD_USED (%FS)
Equal Percent
Linear
0 0.0 0.00 0
5 18.8 1.00 5
10 37.6 2.00 10
15 56.4 3.00 15
20 74.0 4.00 20
25 84.3 5.24 25
30 90.0 6.47 30
35 92.0 8.02 35
Logix 3400MD Digital Positioner LGENIM3405-02 11/13
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