Troubleshooting
B 5-5
Part 1022914G03
E
2007 Nordson Corporation
Corrective Action
Possible Cause
Problem
9. Spray pattern fades or
narrows
Compressed air pressure is too
low
Make sure the air pressure regulator
is working correctly. The pump air
motor requires at least 1.38 bar
(20 psi) air pressure to operate.
Increase the air pressure. Check for
a restriction in the air supply line.
Blockage in hydraulic system
Refer to problem 1.
Nozzles or fluid tips too large, or
too many spray devices connected
to system
Reduce the nozzle or fluid tip size, or
the number of spray devices
connected to the pump.
Spray device nozzle plugging
Remove the fluid filter screen and
inspect it. If the screen is damaged,
replace it. If the screen is
undamaged, replace it with one with
a smaller mesh size.
Circulation valve opened too far
Close the circulation valve
completely, then reopen until pump is
stroking 5 to 10 strokes per minute
with guns turned off.
10. Spray pattern has
tails of unatomized
coating material at the
outer edges
Low hydraulic pressure or partial
blockage in system
Increase the air pressure. Flush the
system with a compatible cleaning
solution. Refer to problem 1.
Material too viscous
Add solvent or heat to the coating
material to lower the viscosity.
Damaged nozzle or fluid tip
Replace the nozzle or fluid tip.
Preventing Air Valve Freezing
As compressed air is exhausted from the air valve, it expands rapidly and
cools the air valve. The PermaFlo air motor exhaust paths have been
designed to minimize blockage due to freezing. A coating of frost on the
muffler surfaces is typically the result of moisture in the air.
If the valve does get cold enough for water vapor to condense and freeze
on or in the mufflers and interfere with the operation of the valve, try one of
the following actions:
S
Run the pump at no more than 8
−
10 strokes per minute.
S
If you are operating the pump at high speed in a humid environment,
lubricate the compressed air with a glycol-based antifreeze fluid. Do not
use an antileak-type antifreeze fluid.
S
Install an air dryer to remove moisture from the air supply.
