Nordson HORIZON 200, Руководство по эксплуатации продукта

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Troubleshooting
6-2
Part 106913 − 04
E 2018 Nordson Corporation
Troubleshooting Procedures
Problem Possible Cause Corrective Action
1. Spray guns are
surging or spitting;
powder flow is
inadequate or
intermittent
Powder in feed hopper
inadequately fluidized
Adjust the fluidizing air pressure.
The powder should be gently boiling.
Refer to problem 4.
Low powder level in feed hopper Add powder to the feed hopper.
Refer to problem 3.
Powder pump venturi nozzles or
throats worn; adapter O-rings
leaking; pump or pickup tube
clogged
Clean the pump and pickup tube.
Replace any worn parts. Replace the
adapter O-rings, if they are damaged.
Obstruction in powder feed hose Disconnect the feed hose from the
pump. Blow the powder out of the
hose with compressed air. Make
sure the hose is clear. Eliminate
kinks or severe bends in hose. Hose
should be no longer than 7.6 m (25 ft)
with a maximum 2.7-m (9-ft) vertical
rise.
Severe tribo-charging in powder
feed hose
Contact your Nordson Corporation
representative for a suitable hose
material. Contact your powder
supplier.
Obstruction in spray gun Clean the spray gun. If you are using
conical nozzles, make sure there is a
3 mm (0.125 in.) or larger gap
between the deflector and the nozzle.
Flow rate or atomizing air pressure
incorrect
Refer to the spray gun and control
unit manuals for recommended air
pressures and ratios.
2. Problems with
coating uniformity,
edge coverage, film
build, wrap, or
penetration into
recesses
Poor workpiece grounding Resistance from the workpiece to the
ground must be less than
one megohm. For best results,
resistance should not be more than
500 ohms. Clean the workpiece
hangers, fixtures, and hooks if
necessary. Check the conveyor
ground.
Gun placement incorrect Position the spray guns 254 − 355 mm
(10 − 14 in.) from the workpieces.
Stagger the spray guns 304 mm
(12 in.) apart vertically and 381 mm
(15 in.) apart horizontally to avoid fan
pattern and electrostatic field overlap.
Contact your Nordson Corporation
representative for advice.
Continued...