Fisher FIELDVUE DVC6200 Instruction Manual page 109

Instruction Manual
D103409X012
Table 7‐3. Instrument Troubleshooting
Symptom
1. Analog input reading at
1a. Control mode not Analog.
instrument does not match
actual current provided.
1b. Low control system compliance voltage.
1c. Instrument shutdown due to self test failure.
1d. Analog input sensor not calibrated.
1e. Current leakage.
2. Instrument will not 2a. Insufficient Voltage Available.
communicate.
2b. Controller output Impedance too low.
2c. Cable capacitance too high.
2d. HART filter improperly adjusted.
2e. Improper field wiring.
2f. Controller output providing less than 4 mA to loop.
2g. Disconnected loop wiring cable at PWB.
2h. PWB DIP switch not set properly.
2j. PWB failure.
2k. Polling address incorrect.
2l. Defective terminal box.
2m. Defective Field Communicator or ValveLink
modem cable.
2n. ValveLink modem defective or not compatible
with PC.
2p. ValveLink hardlock defective or not programmed.
3. Instrument will not 3a. Configuration errors.
calibrate, has sluggish
performance or oscillates.
Possible Cause
Maintenance and Troubleshooting
Action
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. Check system compliance voltage (see Wiring Practices in
the Installation section.
1c. Check instrument status using the Field Communicator (see
Viewing Instrument Status in the Viewing Device Information
section).
1d. Calibrate the analog input sensor (see Analog Input
Calibration in the Calibration section).
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.
2a. Calculate Voltage Available (see Wiring Practices in the
Installation section). Voltage Available should be greater than or
equal to 11 VDC.
2b. Install a HART filter after reviewing Control System
Compliance Voltage requirements (see Wiring Practices in the
Installation section).
2c. Review maximum cable capacitance limits (see Wiring
Practices in the Installation section).
2d. Check filter adjustment (see the appropriate HART filter
instruction manual).
2e. Check polarity of wiring and integrity of connections. Make
sure cable shield is grounded only at the control system.
2f. Check control system minimum output setting, which should
not be less than 3.8 mA.
2g. Verify connectors are plugged in correctly.
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. 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. 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. Check continuity from each screw terminal to the
corresponding PWB connector pin. If necessary, replace the
terminal box assembly.
2m. If necessary, repair or replace cable.
2n. Replace ValveLink modem.
2p. Replace if defective or return to factory for programming.
3h. Verify configuration:
If necessary, set protection to None.
If Out of Service, place In Service.
Check:
Travel Sensor Motion
Tuning set
Zero control signal
Feedback Connection
Control mode (should be Analog)
Restart control mode (should be Analog)
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