Fisher FIELDVUE DVC6200p Instruction Manual page 58

Maintenance and Troubleshooting
June 2017
Table 6‐2. Instrument Troubleshooting
Symptom
5 Input or Output Block does not go to
mode target
6 Transducer block Setpoint
(POSITIONING_VALUE [57]) is not
being automatically updated from the
AO block.
7 Transducer block setpoint
Setpoint(D) (SETPOINT_D [81]) is not
being automatically updated from the
DO block.
8 Valve does not move when the set
point is changed
9 Valve does not stroke from 0 to 100%
with set point change
10 Deviation between set point and
actual valve position remains.
11 The valve cycles, does not stay on
set point.
12 Valve responds too slowly.
56
Possible Cause
5a Physical block actual mode is Out of Service
5b Transducer block actual mode is not Auto.
5c Transducer has detected a hardware failure.
5d Wrong output block is active.
6a Transducer block mode in not Auto.
6b AO block is not active.
7a Transducer block mode is not Auto.
7b DO block is not active.
8a A function block actual mode is Out of Service or
Transducer Block Actual mode is Out of Service or
Manual.
8b Pneumatic connections are incorrect or supply
pressure is incorrect
8c The valve has failed.
8d The I/P converter or relay has failed.
9a Insufficient supply pressure or leak in pneumatic
connections.
10a Digital valve controller output is in cutoff.
10b Digital valve controller is not calibrated correctly
10c Incorrect turning. Tuning that is too conservative will
result in excess error.
11a Large amount of packing friction.
12a I/P converter input filter clogged or air blockage in
I/P assembly nozzle block.
12b O‐ring(s) between I/P converter missing or hard and
flattened losing seal.
12c I/P assembly out of spec.
12d Defective gasket.
Instruction Manual
Action
5a Change Physical block target mode to Auto (refer to
the Physical Block tab under Manual Setup > Classic
View or to host system documentation).
5b Change transducer block target mode to Auto (see
page 13, Transducer Block Mode, refer to the
Transducer Block tab under Manual Setup > Classic
View or to host system documentation).
5c A bad status is passed to the block's READBACK or
FIELD_VAL parameter.
5d Use Outblock Selection to select the desired output
block. The deselected block will have a bad status for
READBACK.
6a Change transducer block mode to Auto.
6b Change Outblock Selection to AO Control.
7a Change transducer block mode to Auto.
8.b Change Outblock Selection to DO Control.
8a1 Change the target mode to an operational mode
(see Appendix C or host system documentation).
8a2 Verify that the correct block (AO or DO) is
configured in Feature Select in the physical block. Only
the selected out block is able to set the transducer
setpoint and move the valve.
8b Check pneumatic connections and supply pressure.
Be sure supply pressure regulator is set correctly.
8c Apply a pneumatic pressure to the valve actuator
and check valve action.
8d Replace the I/P converter or relay (see page 50).
9a Check supply pressure and supply pressure
regulator setting. Check for leaks around pneumatic
connections.
10a Check values for Travel Cutoff High and Travel
Cutoff Low (see page 15 of the Configuration Section or
host system documentation).
10b Perform Auto or Manual Travel Calibration
(see page 35.)
10c Perform Tuning procedure to adjust tuning and
optimize valve response (see page 21).
11a1 Perform Tuning procedure to adjust tuning and
optimize valve response (see page 21).
11a2 Use a larger size actuator.
12a1 Replace I/P converter filter (see Replacing the I/P
Filter on page 49).
12a2 Replace I/P converter (see page 50).
12b Replace O‐ring(s) (refer to page 49).
13c I/P assembly nozzle may have been adjusted.
Verify drive signal (55% to 80%).
Replace I/P assembly if drive signal is continuously high
or low (see page 50).
12d Check gasket for closed holes, excessive
deformation due to overtightening or "oozing". If
necessary, replace gasket (see the beginning of this
section).
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