Earlier we established that a periodic cleaning program was a good thing. Regular cleaning of your corona treating stations will eliminate most problems with them. The station cleaning process is not a difficult one and, if performed on a regular basis, will not take a great deal of time. We suggest that at least monthly you inspect and clean the electrode assemblies, check the assemblies pivot rotation ability, check and clean the surface of the ground roll and the ground brush. At the same time check the electrode air gap and lubricate the bearings.
Electrode Cleaning Procedures In a perfect world you would make sure that the electrodes in your corona treating system were quickchecked daily for general cleanliness and obvious signs of carbon tracking. This simple 1-minute procedure will identify nominal conditions that, if left uncorrected, might grow into problems of major proportions. For your regularly scheduled periodic cleaning program we recommend the following procedure:
- Ensure that all system power is turned off and properly tagged.
- Remove the electrodes from the electrode assembly by:
- Disconnecting the electrode from the high voltage end of the station.
- Pivot the electrode assembly for proper access.
- Loosen the electrode assembly for proper access.
- Inspect the electrodes, looking for carbon tracks on the mounting tabs, loose tabs, deterioration of the high voltage wire and general cleanliness.
- Replace or re-adhere loose or missing mounting tabs with our silicone adhesive (Enercon part no. TS3220) according to the instructions supplied with the adhesive.
- If your electrodes require replacement of the high voltage wire return them to Enercon for repair. Repair of the high voltage wire is not recommended.
- Clean the exterior of the electrodes by wiping with an abrasive cleanser and a Scotch-Brite™ pad. Then wipe-down with isopropyl alcohol to remove any remaining residue and evaporate any remaining moisture.
- Clean the electrode block holders the same way you cleaned the electrodes.
- Inspect the electrode assembly to insure that all cooling ports are clear and that the insulating shroud is free of carbon tracking.
- Loosen accumulated residue from the cooling ports with a stiff bristled brush and remove with compressed air or a vacuum. Use a water-dampened sponge to remove any remaining residue. Finally, wipe-down with isopropyl alcohol to evaporate any remaining moisture.
- To repair the insulating shroud, first remove the bolts that mount the shroud to the outer aluminum housing. Next remove the electrode mounting blocks and the shrouding from the electrode assembly. If carbon tracking is minor it can be removed with a file or a Dremel tool.
- After removal of the carbon tracking the area should be sprayed with Krylon (crystal clear #1301) or an equivalent non-conductive coating. You can now reinstall the shrouding and the electrode mounting blocks. If the carbon tracking is significant the insulating shrouding should be replaced.
- Inspect the PVC elbow at the high voltage end of the electrode. Be alert for signs of wear or deterioration. Replace as necessary.
- You are now just about finished.
All that's left is to re-install the electrodes and reconnect them at the high voltage end of the station. As a final step be sure to tighten the electrode assembly and pivot it back into the operating position.
Originally appeared in eNews: Maintenance 3rd Quarter 2001.