Maintenance and Troubleshooting
June 2017
Instruction Manual
D103176X012
44
Troubleshooting
What is a healthy unit?
In order to troubleshoot the DVC2000 digital valve controller, it is critical to understand how a healthy unit is supposed
to behave. Below is a list of behaviors you should see if the instrument is performing well.
D LCD correctly displaying characters
D Pushbuttons allow navigation
D Valve travels full stroke
D No diagnostics messages
D No alerts or alarms
D Hall sensor within the valid range of travel on the magnet array
D Slight audible air venting
D Minimal overshoot
D Quick response
D Functionality matches the tier level
What are the observable symptoms?
The next thing to do is to identify the symptoms of the unhealthy unit. Are there any obvious discrepancies that can be
identified? Work through the following items to help gather information about the faulty behavior and identify the
core problem(s). Also see the DVC2000 Troubleshooting Checklist on page 47.
1. Check the relay pressure range.
There are two available relays for the DVC2000:
D Low pressure: 0-3.4 bar (0-49 psi) — white label
D High pressure: 3.5-7 bar (50-100 psi) — green label
The supply pressure feeding the instrument must fall within the rated pressure range of the installed relay for proper
operation.
2. Check the instrument protection (LCD via pushbuttons and Configure/Calibrate via HART)
3. Check for local device diagnostic messages
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