Vega DSGH, Quick Reference Manual

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Maintenance and Diagnostics
Replace CPU or Power Supply Board
1.
Turn off power to the gauge.
2.
Remove the housing cover.
3.
Remove the plastic electronics cover.
4.
Remove the terminal wiring connector.
5.
Remove the three (3) screws holding the electronics package in place.
6.
Carefully pull the electronics package out of the housing.
7.
Remove the appropriate board from the clamshell assembly by removing the three
(3) mounting nuts.
If you are changing the CPU board, you must move the old firmware chip to
the new board if the new board firmware is different.
8.
Carefully reconnect any ribbon cables.
9.
Install the electronics package in the housing.
10.
Replace the three (3) mounting nuts.
11.
Reconnect the terminal wiring connector.
12.
Install the plastic electronics cover.
13.
Install the housing cover.
14.
Turn on the power to the unit.
15.
Connect a HART communicator to the unit and verify that the unit is operational.
If you change the CPU board, a New Hardware Found error message
normally appears when you connect with the HART communicator. In
Ohmview 2000, click Diagnostics, New hardware, New CPU and click OK for
a new backup of EEPROMS.
Periodic Maintenance
Follow this suggested schedule to prevent problems and to comply with radiation
regulations.
•
Recalibrate - As required by process conditions.
•
Source holder shutter check - Every 6 months unless otherwise required by the
appropriate nuclear regulatory body.
•
Source wipe - Every 3 years unless otherwise required by the appropriate nuclear
regulatory body.
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