Metal Works CAT990 Mode D'emploi page 22

5. Poor visibility - Excessive dust
- Air inlet at front left above regulator, should be free to allow air into cabinet.
- Dust container full and needs to be cleaned and emptied. Latch at bottom of dust collector or remove black cover on
vacuum.
- Dust cartridge contaminated. Clean or replace filter in dust collector, part 29.
- Media breakdown. Eventually the media becomes so small that it is essentially dust. Replace media and clean dust
collector.
6. Poor visibility - Viewing window
The windows come with a clear plastic protector on them. As these become pitted, they can be easily replaced to
extend the life of the window. The window can also be easily replaced.
7. Poor media flow
- Check for moisture as indicated above. Install moisture trap as needed. Replace damp media and clean hoses and
sump.
- Holes in media hose will cause poor media delivery. Replace hose.
- Debris in media. Replace or screen media.
Maintain suction efficiency with simple steps
The most common problem customers have with their suction blast cabinets is a decrease in production rates. A properly
maintained suction cabinet should provide years of constant service. When production rates fall, the operator can usually
locate the problem by checking:
1. Air supply
If the pressure gauge on the regulator shows an adequate no-load supply (when the blaster is not running), press the
foot pedal. If the pressure drops more than a few psi/bar, your air supply is restricted or inadequate. Clean filters
and moisture separators all the way back to the air compressor. Straighten any kinky lines. Use a master gauge to
check the air pressure or replace existing gauge if you suspect it is giving you false readings.
2. Blasting gun
The nozzle will wear out eventually. Replace it if it measures 1/16"/0.15 cm over its original size or if it shows
uneven wear. Adjust as needed for different media and conditions. A properly working gun will pull 15-17
inches/38-43 cm of mercury on a manometer.
3. Dust collector
Inadequate cabinet ventilation results in reduced cleaning power at the nozzle as well as diminished view of the
work in progress. Use the dust collector's shaker every 20-30 minutes when the cabinet is turned off (more often in
dusty conditions). Empty dust collector at least once a day. Remove filter and blow out occasionally to keep the dust
collector or vacuum working efficiently. Replace as needed.
4. Media
Use quality blast media sized to the job. Damp or dirty media can bring blasting to an instant halt. Store media in
a dry area and load the appropriate quantity. Add enough media through the flooring to have 6"/15 cm deep of
media on top of the metering valve. If you run out of media as you are blasting, add enough so it keeps circulating to
the gun. The media will eventually break down or get too contaminated to use. The less there is in the system, the less
you will have to replace.
5. Media delivery
Replace any media hose that has soft spots or visible wear. Adjust the metering valve to provide adequate flow. A
mixture that is too rich will cause pulsating at the gun. An unusually loud noise while blasting means the mixture is
too lean. A rich mixture can result in lower impact velocities, while a lean mixture reduces the number of impacts.
Both reduce your cleaning rate.
If everything is adjusted right and you are still not getting the production levels needed, contact your distributor. The
suction system may be operating properly, it may be time to get a cabinet with a media reclaimed or a pressure system.
Many upgrades are available.
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CAT990 - NLFRENES - v1.0 - 19082013
EN