Fisher FIELDVUE DVC6200p Instruction Manual page 59

Instruction Manual
D103563X012
Table 6‐2. Instrument Troubleshooting
Symptom
13 Instrument will not calibrate, has
sluggish performance or oscillates.
14 Instrument will not calibrate.
15. Erroneous pressure readings.
Possible Cause
12e Defective relay.
12f If responds slowly only upon air demand, there may
be a restriction in the air line, the supply run may be
excessively long, or the supply regulator may be
defective or capacity not large enough.
13a Travel sensor failed.
13b Travel feedback is out of accepted range
13c Cables not plugged into PWB correctly.
13d Configuration errors.
13e Restricted pneumatic passages in I/P converter
13f O‐ring(s) between I/P converter assembly missing or
hard and flattened losing seal.
13g I/P converter assembly damaged/corroded/clogged. 13g Check for bent flapper, open coil (continuity),
13h I/P converter assembly out of spec.
13i Defective module base seal.
13j Defective relay.
13k Defective 67CFR regulator, supply pressure gauge
jumps around.
14a Configuration errors.
14b Magnet assembly is not correctly installed.
14c Cables not plugged into PWB correctly.
15a Defective pressure sensor(s).
15b Pressure sensor O‐ring(s) missing.
Maintenance and Troubleshooting
Action
12e Remove relay, inspect for missing Belleville washer,
missing valve spring, missing valve plug. Inspect "lip"
under top O‐ring for breakage due to relay removal.
Inspect O‐rings and replace if hard or damaged.
Replace parts or relay if I/P assembly good and air
passages not blocked (see page 52).
12f1 Check supply line to ensure it is not clogged or
damaged. Replace if necessary.
12f2 If supply run is excessively long, a volume tank
may need to be installed on the the supply side of the
pressure regulator
12f3 Replace supply regulator
13a Replace the housing (key 1)
13b Check the mounting. Ensure the correcting
mounting kit has been selected and the magnetic array
is properly installed.
13c Inspect connections and correct.
13d Verify configuration. Use Device Setup.
13e Check screen in I/P converter supply port of the
module base. Replace if necessary. If passages in I/P
converter restricted, replace I/P converter (see page
50).
13f Replace O‐ring(s) (refer to the I/P Converter section
on page 49).
contamination, staining, or dirty air supply. Coil
resistance should be between 1680 ‐ 1860 ohms.
Replace I/P assembly if damaged, corroded, clogged, or
open coil (see page 50).
13h I/P converter assembly nozzle may have been
adjusted. Verify drive signal (55 to 80% for
double‐acting; 60 to 85% for single‐acting) with the
valve off the stops. Replace I/P converter assembly if
drive signal is continuously high or low (see page 50).
13i Check module base seal for condition and position.
If necessary, replace seal. Refer to Module Base
Maintenance on page 46.
13j Depress relay beam at adjustment location in
shroud, look for increase in output pressure. Remove
relay, inspect relay seal. Replace relay seal or relay if I/P
converter assembly good and air passages not blocked
(refer to page 52). Check relay adjustment (refer to
page 37 of the Calibration Section).
13k Replace 67CFR regulator.
14a Verify configuration.
14b Check the mounting. Ensure the correcting
mounting kit has been selected and the magnetic array
is properly installed.
14c Inspect connections and correct.
15a Replace PWB (see page 51).
15b Replace O‐ring(s).
June 2017
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