BNP PRESSURE BLAST CONVERSION KIT Page 10
8.0 TROUBLESHOOTING
To avoid serious injury, observe the following when
troubleshooting.
Turn off the air, and lock out and tag out the air
supply.
If checking the controls requires air, always
enlist the aid of another person to:
Hold the nozzle securely.
Operate the foot pedal.
Never bypass the foot pedal or wedge it in the
operating position.
Never override the door interlock system.
8.1 Poor Visibility
8.1.1 Motor rotating backwards. The motor should
rotate as indicated by the arrow on the housing. If it does
not rotate in the proper direction, LOCK-OUT AND TAG-
OUT POWER and switch the motor leads as shown on
the motor plate.
8.1.2 Hole worn in flex hose between cabinet hopper
and reclaimer inlet (if RP collector is used also check
hose between the reclaimer outlet and dust collector
inlet). Replace hose and route it with as few bends as
possible to prevent wear.
8.1.3 Reclaimer door open.
8.1.4 Obstruction in flex hose between the cabinet
hopper and reclaimer inlet.
8.1.5 Paddle wheel worn. Check wheel for wear.
8.2 Abnormally High Media Consumption
8.2.1 Door on reclaimer open, or improper fit or worn
door gasket. Air entering the reclaimer at this point will
cause media to be carried into the dust collector. DO
NOT operate unless all doors are closed.
8.2.2 Dust collector damper open too far. Adjusts
static pressure per Section 5.3.
8.2.3 Media may be too fine or worn-out.
8.2.4 Using friable media that rapidly breaks down.
8.2.5 Nozzle pressure too high for the media, causing
media to break down.
8.2.6 Hole worn in reclaimer, or leak in reclaimer
seams. Check entire reclaimer for negative-pressure
leaks.
8.2.7 Optional externally adjustable vortex cylinder out
of adjustment, See Section 5.4.
8.2.8 If using very fine media (200 mesh and finer),
the inlet baffle of the reclaimer may need to be removed.
Consult the factory before proceeding with this option.
8.3 Reduction In Blast Cleaning Rate
8.3.1 Low media level reducing media flow. Check
and fill if low.
8.3.2 Incorrect metering valve adjustment. Adjust per
Section 5.2.
8.3.3 Reduced air pressure. This may be caused by a
malfunctioning regulator, a dirty filter element in air filter,
partially closed air valve, leaking air line, or other air
tools in use.
8.3.4 Blockage in nozzle. Blockage may occur as a
result of a missing debris screen.
8.3.5 Moist media. Frequent bridges or blockage in
the area of the metering valve can be caused by
moisture. See Section 8.5.
8.4 Plugged Nozzle
8.4.1 A damaged or missing reclaimer screen will
allow large particles to pass and block the nozzle.
Replace or re-install as necessary.
8.5 Media Bridging
8.5.1 Frequent bridging or blockage in the media
metering valve can be caused by damp media. Media
becomes damp by blasting parts that are slightly oily,
from moisture in the compressed air line, or from
absorption.
8.5.2 To avoid contaminating media from the
workpiece, all parts put into the cabinet should be clean
and dry. If parts are oily or greasy, degrease and dry
them prior to blasting.
8.5.3 Moist compressed air may be due to a faulty
compressor that overheats, or pumps oil or moisture into
the air line, too long an air line permitting moisture to
condense on the inside, and from high humidity. Drain
filters and receiver tank regularly. If the problem persists,
WARNING
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