Emerson Fisher FIELDVUE DVC6000, Instruction Manual

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DVC6000 Digital Valve Controllers
September 2013 7-16
Table 7-3. Instrument Troubleshooting
Symptom Possible Cause Action
1. Analog input reading at
instrument does not match
actual current provided. 1a. Control mode not Analog. 1a. Check the control mode using the Field Communicator. If
in the Digital or Test mode, the instrument receives its set
point as a digital signal. Control is not based on input current.
Change Control Mode to Analog.
1b. Low control system compliance voltage. 1b. Check system compliance voltage (see Wiring Practices
in the Installation section.
1c. Instrument shutdown due to self test failure. 1c. Check instrument status using the Field Communicator
(see Viewing Instrument Status in the Viewing Device
Information section).
1d. Analog input sensor not calibrated. 1d. Calibrate the analog input sensor (see Analog Input
Calibration in the Calibration section).
1e. Current leakage. 1e. Excessive moisture in the terminal box can cause current
leakage. Typically the current will vary randomly if this is the
case. Allow the inside of the terminal box to dry, then retest.
2. Instrument will not
communicate. 2a. Insufficient Voltage Available. 2a. Calculate Voltage Available (see Wiring Practices in the
Installation section). Voltage Available should be greater than
or equal to 11 VDC.
2b. Controller output Impedance too low. 2b. Install a HART filter after reviewing Control System
Compliance Voltage requirements (see Wiring Practices in the
Installation section).
2c. Cable capacitance too high. 2c. Review maximum cable capacitance limits (see Wiring
Practices in the Installation section).
2d. HART filter improperly adjusted. 2d. Check filter adjustment (see the appropriate HART filter
instruction manual).
2e. Improper field wiring. 2e. Check polarity of wiring and integrity of connections. Make
sure cable shield is grounded only at the control system.
2f. Controller output providing less than 4 mA to loop. 2f. Check control system minimum output setting, which
should not be less than 3.8 mA.
2g. Disconnected loop wiring cable at PWB. 2g. Verify connectors are plugged in correctly.
2h. PWB DIP switch not set properly. 2h. Check for incorrect setting or broken DIP switch on the
back of the PWB. Reset switch or replace PWB, if switch is
broken. See table 7-2 for switch setting information
2j. PWB failure. 2j. Use a 4
−
20 mA current source to apply power to the
instrument. Terminal voltage across the LOOP+ and LOOP
−
terminals should be 9 to 10.5 VDC. If the terminal voltage is
not 9 to 10.5 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 and Polling. Select 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
modem cable. 2m. If necessary, repair or replace cable.
2n. ValveLink modem defective or not compatible
with PC. 2n. Replace ValveLink modem.
2p. ValveLink hardlock defective or not programmed. 2p. Replace if defective or return to factory for programming.
3. Instrument will not
calibrate, has sluggish
performance or oscillates. 3a. Travel sensor seized, will not turn. 3a. Rotate feedback arm to ensure it moves freely. If not,
replace the pot/bushing assy.
3b. Broken travel sensor wire(s). 3b. Inspect wires for broken solder joint at pot or broken wire.
Replace pot/bushing assy.
3c. Travel sensor misadjusted. 3c. Perform Travel Sensor Adjust procedure in the Calibration
section.
3d. Open travel sensor. 3d. Check for continuity in electrical travel range. If necessary,
replace pot/bushing assy.
3e. Cables not plugged into PWB correctly. 3e. Inspect connections and correct.
3f. Feedback arm loose on pot. 3f. Perform Travel Sensor Adjust procedure in the Calibration
section.
3g. Feedback arm bent/damaged or bias spring
missing/damaged. 3g. Replace feedback arm and bias spring.
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