Fisher® FIELDVUE DVC6200 Digital Valve Controller

Instruction Manual
D103605X012
Maintenance and Troubleshooting
July 2012
Table 6‐3. Instrument Troubleshooting
Symptom Possible Cause Action
2. Instrument will not
communicate.
3. Instrument will not
calibrate, has sluggish
performance or oscillates.
2j. PWB failure. 2j. Use a 4-20 mA current source to apply power to the
instrument. Terminal voltage across the LOOP+ and LOOPterminals
should be 8.0 to 9.5 VDC. If the terminal voltage is not
8.0 to 9.5 VDC, replace the PWB.
2k. Polling address incorrect. 2k. Use the Field Communicator to set the polling address (refer
to the Detailed Setup section). From the Utility menu, select
Configure Communicator > Polling > Always Poll. Set the
instrument polling address to 0.
2l. Defective terminal box. 2l. Check continuity from each screw terminal to the
corresponding PWB connector pin. If necessary, replace the
terminal box assembly.
2m. Defective Field Communicator or ValveLink
2m. If necessary, repair or replace cable.
modem cable.
2n. ValveLink modem defective or not compatible
2n. Replace ValveLink modem.
with PC.
2p. ValveLink hardlock defective or not programmed. 2p. Replace if defective or return to factory for programming.
3a. Configuration errors. 3h. Verify configuration:
If necessary, set protection to None.
If Out of Service, place In Service.
Check:
Travel Sensor Motion
Tuning set
Zero Power Condition
Feedback Connection
Control mode (should be Analog)
Restart control mode (should be Analog)
4. ValveLink diagnostic tests
provide erroneous results.
5. Field Communicator does
not turn on.
3b. Restricted pneumatic passages in I/P converter. 3j. 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.
3c. O‐ring(s) between I/P converter ass'y missing or hard 3k. Replace O‐ring(s).
and flattened losing seal.
3d. I/P converter ass'y damaged/corroded/clogged. 3l. Check for bent flapper, open coil (continuity), 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.
3e. I/P converter ass'y out of spec. 3m. I/P converter ass'y 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.
3f. Defective module base seal. 3n. Check module base seal for condition and position. If
necessary, replace seal.
3g. Defective relay. 3p. 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 is good and
air passages not blocked. Check relay adjustment.
3h. Defective 67CFR regulator, supply pressure gauge 3q. Replace 67CFR regulator.
jumps around.
4a. Defective pressure sensor. 4a. Replace PWB.
4b. Pressure sensor O‐ring missing. 4b. Replace O‐ring.
5a. Battery pack not charged. 5a. Charge battery pack.
Note: Battery pack can be charged while attached to the Field
communicator or separately. The Field Communicator is fully
operable while the battery pack is charging. Do not attempt to
charge the battery pack in a hazardous area.
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