Emerson Mobrey Hydratect 2462, Справочное руководство, Страница: 60 / 66

54
Reference Manual
24625020, Rev AA
Electronics Servicing
March 2017
Electronics Servicing
15. Remove the faulty electrode cable and connect a new one, as described in
Section 3: Installing the Electronics Control Unit .
16. Switch on the external power supplies to the electronics unit, and then check the
system as described in
Section 4: System Testing . There should now be no further
problem.
6.3 Electrode contamination
A contaminated electrode may be cleaned as described in Section 5: Electrodes Servicing .
6.4 Electronic component failure
When on-site, an electronic component failure can be repaired only by removing the logic
card and fitting a new card.
Logic card replacement procedure
1. Switch off the external power supplies to the Hydratect 2462 Electronics Control
Unit (“Control Unit”).
2. Undo the two screws securing the front panel of the Control Unit, and then
carefully withdraw the front panel from the case.
3. Remove the connectors from the power supply and from the logic card.
4. Remove the power supply card and the logic card. Five screws and five threaded
pillars must be removed to do this.
5. Return the logic card to Rosemount Measurement Limited for servicing.
6. Fit a new logic card and the original power supply card, securing these with the
threaded pillars and screws removed in step
4 .
7. Re-fit the connectors to the power supply and logic cards, ensuring the
connections are made correctly to each channel.
8. Switch on the external power supplies to the Control Unit, and then check the
system as described in
Section 4: System Testing .