Final_Value_Cutoff; Troubleshooting - Flowserve Logix 3400MD User Instructions

15 Troubleshooting

Table XVIII: Troubleshooting
Failure
No LED is blinking
Erratic communications
Unit does not respond to Final
Value commands
Valve position reading is not what
is expected
Position is driven fully open or
closed and will not respond to
command
Sticking or hunting operation of
the positioner
* 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.
50
Probable Cause
Voltage of supply source is not high enough
Current draw incorrect
Maximum cable length or cable impedance exceeded
Improper grounding
Interference with I.S. barrier
Host FB card not configured or connected correctly
Unit is in Auto mode
Error occurred during calibration
Positioner tubing backwards
Stem position sensor mounting is off 180°
Stroke not calibrated
Tight shutoff is active
Customer characterization or soft stops active
Stroke not calibrated
Inner-loop hall sensor not connected
Wrong air action entered in software
Actuator tubing backward
Driver module Electro-pneumatic converter malfunctioning
Control parameter inner-loop offset is too high/low
Contamination of the driver module
Control tuning parameters not correct
Packing friction high
Corroded or dirty spool valve
Logix 3400MD Digital Positioner FCD LGENIM3404-00 – 9/09
Corrective Action
Verify that voltage source can supply at least 9 V
Verify current draw of device (23 mA) and that of other
devices on the loop aren't pulling too much current
Check cable conduction size, length and capacitance. Refer
to Section 6.4, "Cable Requirements"
Terminate and ground segment properly.
Must use FF-compatible I.S. barrier
Check connections and configurations of card
Put in OOS mode
Check blink codes on positioner and correct
calibration error. Recalibrate
Re-tube the actuator
Remount position sensor
Perform RE-CAL
Verify settings using PC or handheld software
Verify customer characterization and soft stops
Check DIP switch settings and calibrate valve stroke
Verify hardware connections
Check ATO (Air-to-open) and ATC
(Air-to-close) settings. Recalibrate
Verify ATO/ATC actuator tubing
Replace driver module
Adjust inner-loop offset and see if proper control resumes
Check air supply for proper filtering and meeting ISA
specifications ISA-7.0.01. Check the spool valve for
contamination
Adjust gain settings using local gain switch
Enable the stability DIP switch on the local interface and
recalibrate. If problem persists, enable pressure control with
handheld communicator or SoftTools and recalibrate
Disassemble and clean spool valve