Troubleshooting
6-3
Part 1108061-02
E 2015 Nordson Corporation
Corrective ActionPossible CauseProblem
2. Problems with
coating uniformity,
edge coverage, film
build, wrap, or
penetration into
recesses
(contd)
Electrostatic voltage (kV) or AFC
setting incorrect for workpieces
being coated
Adjust the voltage to 90−100 kV for
large flat surfaces and 60−75 kV for
recesses. Never set the voltage
below 60 kV. Refer to the spray gun
and control unit manuals for the
recommended voltage, AFC, and air
pressure settings and ratios.
Wrong nozzles being used Use flat spray nozzles for large,
regular-shaped workpieces. Use
conical nozzles for deep recesses
and most manual touch-ups.
Powder feed problems Refer to problem 1.
3. Powder in sieve
contaminated
Screen torn Replace the screen.
4. Excessive noise from
sieve while operating,
powder leaking from
sieve
Sieve clamps not tightened,
isolators loose or damaged, rubber
sleeves damaged
Make sure the sieve clamps are tight.
Check the isolators for looseness or
damage. Tighten the isolator
mounting screws. Check the rubber
sleeves for damage, replace if
necessary.
5. Powder in feed
source not fluidizing,
or clouds of powder
erupting from surface
Fluidizing air pressure too low or
too high
Check the powder in the feed source.
Increase the fluidizing air pressure
until the powder is gently boiling.
Decrease the pressure if clouds of
powder are erupting from the surface.
Moist or oil-contaminated powder Check the air supply for water or oil.
Check the filters, separators, and air
dryer.
Incorrect ratio of reclaimed-to-new
powder
Add new powder to the feed source.
The powder ration should be no more
than 3 parts reclaim-to-1 part new.
Uneven distribution of powder in
feed source
Increase the fluidizing air pressure.
Check the powder and the fluidizing
plate (if applicable) for contamination.
6. Final filters clogged,
powder in fan or final
filter housing
Leaking cartridge filter gaskets, or
damaged filter media
Make sure the gaskets are sealing
correctly. If a 0.4 mm (0.015-in.)
feeler gauge slips between the
gasket and the sealing surface,
tighten the tension nuts to compress
the gaskets. Refer to Cartridge Filter
Replacement in the Repair section
for instructions.
If the gaskets continue to leak,
remove the cartridges. Clean and
inspect the gaskets, sealing surfaces,
and filter media. Replace the
cartridges if the gaskets or filter
media are damaged. Replace
clogged final filters.
Leaks in afterfilter housing
allowing powder to bypass filters
Locate and seal any leaks with RTV
sealant.
Continued...
To Next Page
Loading...
