Flowserve 3400IQ Digital Positioner - Manual (Page 77)

Logix 3400IQ Digital Positioner FCD LGENIM3401-00 – 06/06
flowserve.com
Failure Probable Cause Corrective Action
Position is
driven fully
open or closed
and will not
respond to
command
Stroke not calibrated
Check DIP switch settings and calibrate valve
stroke
Inner-loop hall sensor not connected Verify hardware connections
Wrong air action entered in software
Check ATO (Air-to-open) and ATC
(Air-to-close) settings. Recalibrate
Actuator tubing backward Verify ATO/ATC actuator tubing
Driver module Electro-pneumatic converter
malfunctioning
Replace driver module
Control parameter inner-loop offset is too
high/low
Adjust inner-loop offset and see if proper
control resumes
Sticking
or hunting
operation of
the positioner
Contamination of the driver module
Check air supply for proper filtering and
meeting ISA specifications ISA-7.0.01.
Check the spool valve for contamination
Control tuning parameters not correct Adjust gain settings using local gain switch
Packing friction high
Enable the stability DIP switch on the local
interface and recalibrate. If problem persists,
enable pressure control with handheld
communicator or SoftTools and recalibrate
Corroded or dirty spool valve Disassemble and clean spool valve
* Final Value Cutoff
NOTE: Refer to blink codes for self diagnostics of other errors. See document #VLAIM0046. Refer to
Logix 3400/1400 Reference Manual for Fieldbus related troubleshooting.