Graco EcoQuip 2 Vapor Abrasive Blast System Operation, Repair, And Parts page 28

Troubleshooting
Problem
Problem Problem
While the blast control The supply air pressure is
switch (B) is engaged, fluctuating
the blast air flow is
fluctuating.
The main air regulator is
malfunctioning or is stuck
open.
The electric blast control
circuit is malfunctioning.
The pneumatic blast control
circuit is malfunctioning.
The blast spray The air supply is inadequate.
pattern is sputtering
or irregular.
The blast hose was not
properly cleaned out after
previous use.
The abrasive metering valve
setting is too high for the blast
pressure and/or abrasive
type.
The pot does not have a
sufficient amount of abrasive.
There is an obstruction in the
nozzle
There is an obstruction inside
the pot or inside the abrasive
hose between the pot and the
enclosure.
Too much dust occurs There is not enough water in
during blasting. abrasive mixture.
The blast pressure too high.
The abrasive is too fine for the
application.
28
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Cause
Cause Cause
Make sure the compressor meets minimum flow
requirements and is operating properly. See
Technical Specifications, page 67
flow requirements.
Disassemble the main air regulator and check for
obstructions. Replace or repair parts as necessary (see
Enclosure Box Parts, page
Inspect the hose cable for damaged or shorted partially
open wiring. Check the 3A fuse and replace if necessary.
Check for loose wire connections on the recessed plugs on
the control box (P) and all external cables. Check continuity
through the electric blast control switch (B) (the switch is
normally open). If all above items are functional, replace the
4-way solenoid valve.
Actuate the blast control switch (B) and check for proper spool
valve actuation in the 4-way valve. If no actuation occurs,
check the blast control switch by disconnecting the yellow
tube at the enclosure male quick disconnect and engage the
control switch. If only a little air comes from the fitting, check
the twin-line hose for damage or crimping and check the
pneumatic blast control filter. If the twin-line and filter are
clean, replace the pneumatic blast control switch. If the switch
is functioning, make sure the yellow tubing inside the control
box is properly connected and clear any obstructions. If all
above items are functional, replace the 4-way solenoid valve.
Make sure the air compressor is capable of supplying
the minimum air flow requirement for your system (see
Technical Specifications, page
pressure gauge reads 100-175 psi (6.8–12 bar, 0.68–1.2
MPa). If the gauge does not read 100–175 psi, check the air
compressor for proper setup. Make sure the air inlet filters
are clean and replace if necessary.
See Shutting Down, page
See Setting the Abrasive Metering Valve, page
Refill the pot with abrasive (see
Refilling the Pot with Abrasive, page
Remove the nozzle and inspect for blockage, buildup, or
damage. Replace if necessary.
Perform
Pressure Relief Procedure, page
hose disconnected, inspect the interior of the pinch hose
for obstructions or debris and replace if necessary (see
Replacing the Pinch Hose, page
from the bottom of pot. Inspect the bottom of the pot and
abrasive hose for obstructions or debris.
See Using the Water Dose Meter, page 24
available for non-Elite models).
Decrease the blast pressure and re-evaluate the dust levels.
Try a coarser or harder abrasive if possible.
Solution
Solution Solution
for more information on
50).
67). Make sure the air inlet
21.
Draining the Pot, page 22, followed by
10. With the abrasive
32). Remove the tri-clamp
17.
21).
(an upgrade kit is
3A3489E