Emerson Fisher FIELDVUE DVC6000f Instruction Manual page 283

Symptom
6. Block dynamic parameters do not
update
7. Transducer block Setpoint
(FINAL_VALUE [13]) is not being
automatically updated from the AO
block.
8. Transducer block setpoint
Setpoint(D) (SETPOINT_D [32]) is not
being automatically updated from the
DO block.
9. Valve does not move when the set
point is changed
10. Valve does not stroke from 0 to
100% with set point change
11. Deviation between set point and
actual valve position remains.
12. The valve cycles, does not stay on
set point.
13. Valve responds too slowly.
December 2009
Maintenance and Troubleshooting
Table 7-2. Instrument Troubleshooting (Continued)
Possible Cause
6.a Block actual mode is Out of Service
7.a Transducer block mode in not Auto.
7.b AO block is not active.
8.a Transducer block mode is not Auto.
8.b DO block is not active.
9.a A function block actual mode is Out of Service or
Transducer Block Actual mode is Out of Service or
Manual.
9.b Pneumatic connections are incorrect or supply
pressure is incorrect
9.c Instrument is in fault state.
9.d The valve has failed.
9.e The I/P converter or relay has failed.
10.a Insufficient supply pressure or leak in pneumatic
connections.
10.b Setpoint may be limited.
11.a Digital valve controller output is in cutoff.
11.b Digital valve controller is not calibrated correctly
11.c Incorrect turning. Tuning that is too conservative
will result in excess error.
12.a Large amount of packing friction.
13.a Insufficient instrument gain.
13.b I/P converter input filter clogged or air blockage in
I/P ass'y nozzle block.
13.c O-ring(s) between I/P converter missing or hard
and flattened losing seal.
−Continued−
Action
6.a Change the block target mode to an operational
mode (see F fieldbus Communication,
OUNDATION
Appendix D and host system documentation).
7.a Change transducer block mode to Auto.
7.b Change Outblock Selection to AO Control.
8.a Change transducer block mode to Auto.
8.b Change Outblock Selection to DO Control.
9.a1 Change the target mode to an operational mode
(see F fieldbus Communication,
OUNDATION
Appendix D and host system documentation).
9.a2 Verify that the correct block (AO or DO) is
configured in Feature Select in the resource block.
Only the selected out block is able to set the
transducer setpoint and move the valve.
9.b Check pneumatic connections and supply
pressure. Be sure supply pressure regulator is set
correctly (see Pressure Connections on page 2-19 of
the Installation Section).
9.c Set Clear FState to Clear (Refer to Fault State on
page 4-5 of the Detailed Setup / Blocks Section, or
host system documentation).
9.d Apply a pneumatic pressure to the valve actuator
and check valve action.
9.e Replace the I/P converter or relay (see Replacing
the I/P Converter on page 7-7).
10.a Check supply pressure and supply pressure
regulator setting. Check for leaks around pneumatic
connections.
10.b Check the AO Block values of SP_HI_LIMIT
and SP_LO_LIMIT (see page 4-77 of the Detailed
Setup / Blocks Section or host system
documentation).
11.a Check values for Travel Cutoff High and Travel
Cutoff Low (see page 4-25 of the Detailed Setup /
Blocks Section or host system documentation).
11.b Perform Auto or Manual Travel Calibration
(Travel Calibration on page 5-2.)
11.c Perform Stabilizing/Optimize Valve Response
procedure to adjust tuning and stabilize/optimize
valve response (see Stabilize/Optimize on page
4-23).
12.a1 Perform Stabilizing/Optimize Valve Response
procedure to adjust tuning and stabilize/optimize
valve response (see Stabilize/Optimize on page
4-23).
12.a2 Use a larger size actuator.
13.a Perform Stabilize/Optimize Valve Response
procedure to adjust tuning and stabilize valve
response (see Stabilize/Optimize on page 4-23).
13.b1 Replace I/P converter filter (see Replacing the
I/P Filter on page 7-6).
13.b2 Replace I/P converter (see Replacing the I/P
Converter on page 7-7).
13.c Replace O-ring(s) (refer to the I/P Converter
section on page 7-6).
7
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