Flowserve 400MD Logix - Manual (Page 25)

Fieldbus Configuration Application
The Logix 3400MD digital positioner is configured using a fieldbus configuration application running on a operator station or host computer.
The configuration tool allows the user to:
Connect function block inputs and outputs according to the process requirements.
• Make changes to function block parameters according to the process requirements
• Make changes to the schedule of function block execution.
• Write the FBAP changes to the device.
Mechanical Configuration Issues
Air Action: Air-to-open and Air-to-close are determined by the actuator tubing, not the software. When air action selection is made during configuration, the
selection is telling the control which way the actuator is tubed. The tubing should be verified as correct prior to a stroke calibration. The top output port on
the positioner is called port 1. It should be tubed to the increase open side of the actuator. That is, for an air-to-open actuator, port 1 should go to the bottom
of the actuator.
The Logix 3400MD positioner has an electrical measurement range of 130°. That is, the electronics will sense stem position over a 130° range
of travel of the follower arm. On a rotary valve, the typical rotation is 90°. When installing a Logix 3400MD positioner on a rotary valve, the 90°
valve rotation must be centered within the 130° electrical range. If mechanical movement falls outside the electrical measurement range, the
positioner can have a dead band at one end of travel in which valve move ment cannot be sensed.
Question: How do I know if the rotary linkage is centered within the 130° electrical range?
Answer: The slot in the take-off arm has enough clearance around the roller pin to move the follower arm slightly. Move the valve to the fully closed position.
At this position, move the follower arm within the slot clearance. If the valve does not respond to the movement; linkage adjustment is necessary. Repeat
this test at the fully open position.
To adjust the stem position linkage, use the A/D feedback variable viewed using AD_RAW_FB param eter. Set TEST_MODE bit ‘Enable diagnostic Variable ac-
cess.’ With the valve in its mechanical fail position (i.e. no pressure applied), slightly move the follower arm while watching the A/D feedback. If the number
does not change, the arm is not centered in the electrical range. (The number will bounce one or two counts due to noise at a fixed position and should not
be considered a change, it should move greater than 10 to 20 counts if the linkage is centered correctly). Rotate the take-off arm, if necessary, to bring the
linkage in range. This procedure is only necessary on a rotary mounting. For Linear mountings, the red LED will blink if 65° travel is exceeded. Refer to the
Calibration section for further information on stroke calibration errors.
Default Configuration
An FBAP containing default configuration parameters is resident in the firmware of the device and is loaded on power-up. By using the NI-FBUS Configurator
(or other fieldbus configuration) application, the user can create or make changes to a FBAP for the device’s process application.
Device Configuration
Configuring the Logix 3400MD digital positioner results in:
• Function blocks that execute according to a user-defined schedule
• Measurements that are processed according to various user-configured parameters found within function blocks
• An output published on the fieldbus network according to a user-defined publishing schedule.
Device Configuration Example
A sample printout of a typical device configuration for the Logix 3400MD digital positioner is given in Appendix A, Sample Configuration Record.
Logix 3400MD Digital Positioner LGENIM3405-02 11/13
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