Digital Control Valve (DCV) Calibration Procedure

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CALIBRATION PROCEDURE FOR DIGITAL CONTROL VALVE 

The below calibration procedure for Digital Control Valve. Make : Fisher, Model :  DVC 6000

Also Read : Digital Control Valve Principle

Tools Required:

1. 375 Field communicator
2. Tools kit
3. DATA sheet

Calibration Procedure

  1. Take the work permit from shift in-charge
  2. Checking for valve accessories any damage for DVC feed back, guage, air regulator and filter
  3. Check the pressure regulator guage and set it according to bench set
  4. Check the positioner cam alignment ,cam alignment should be matched with travel length
  5. Operate the valve from DCS, observe the valve travelling condition , if it is not matching with our requirement then we have to connect the 375 field communicator at positioner terminal ( ie. Loop + and -)
  6. Switch on the communicator then select FF application in Communicator.
  7. Select required tag number from list ,then select transducer block and select configuration setup
  8. Again click basic setup enter in to setup wizard, transducer go to manual mode for performing setup
  9. As per data sheet , check the data’s whether it is matching or not
    a) Travel length
    b) Check the pressure unit (psi or kg/cm2)
    c) Check actuator manufacture and model number and actuator size
  10. Now we will go for auto calibration standard than select manual crossover adjustment
  11.  Then check visually whether feedback arm is matching with the hole of the DVC body or not?
  12. Run performance tuner and check the valve operation
  13. Calibration over than change the valve auto mode
  14. Check for valve stroke after auto calibration from DCS

TroubleShooting:

  • If Valve hunting is vigorously
    a) Go to detail setup
    b) Go to response control
    c) Click travel tuning

For fisher control valve adjust travel tuning set to lower alphabet ( If setting was D we have to select C).

For other valves we have adjust proportional gain

  • If Valve is over shooting
    a) Go to detail setup
    b) Go to response control
    c) Click pressure tuning

For fisher control valve adjust pressure tuning set to lower alphabet ( If setting was D we have to select C).

For other valves we have adjust proportional gain

NOTE:

Relay – A = Double Acting
Relay –B = Reverse acting
Relay –C = Forward & Reverse acting

Article by
Vamsi

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