Instruction Manual

Maintenance and Troubleshooting
April 2014
Instruction Manual
D103176X012
72
7. Remove the two screws holding the pneumatic relay to the mounting frame.
8. Pull the pneumatic relay straight out.
Assembly
When installing a new pneumatic relay, follow the reverse procedure as outlined above and recalibrate the instrument.
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 75.
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.