Ransburg RMA Dual Purge Direct A12300 - Manual (Page 59)

Internal Fluid Path Purge
Cleaning and Load
Cleaning the incoming paint line (from paint supply
source such as color manifold through the fluid
manifold and bell assembly):
High voltage does not have to be turned off
if flushing through the dump valve, but must
be turned off if flushing through the bell cup
or any bell cup flushing sequence.
Open the dump valve and flush the incoming paint
line with solvent or an air/solvent chop. Make
sure the last step of the sequence is air to purge
the dump line of remaining solvent. To speed
the loading of the new paint, leave the dump line
open to allow the air in front of the paint push to
escape. The length of time the dump valve is
open depends on several factors such as viscosity,
paint pressure, etc. Timing should be such that
the dump is closed as the paint reaches the trigger
valve in the atomizer. Paint in the dump line may
cause high voltage issues.
The fluid coil and fluid tube can be cleaned
independently by actuating the solvent valve in
the atomizer. High voltage must be turned off
during this operation and the bell cup must be
spinning (typically 30,000 RPM for cup flushing
sequences).
If utilizing a dual purge manifold, one side of the
valve manifold in the atomizer can be cleaned and
loaded with new paint while the other side of the
manifold is in the spraying operation. When the
new color on the second side needs to be sprayed,
only the fluid coil and fluid tube needs to be purged,
making cycle time very fast and efficient.
RMA-303 Dual Purge/Direct Charge - Maintenance
54
† The maximum flow rate of 700 cc/min. must
not be exceeded during a flush routine. Use
of an in-line fluid restricter is recommended.
(Example: P/N RIL-6-AJ or similar)
C A U T I O N
!
Bell Cup Cleaning (Cup Wash)
(Without Cleaning the Incoming
Paint Line)
Turn off the high voltage and trigger valve. With
the bell spinning at 30,000 rpm, turn on the ex-
ternal solvent valve to allow cleaning solvent to
flow through the manifold passages, through the
fluid tube, and onto the bell. The spinning bell will
atomize the solvent, clean out the bell passages
both internally and externally. It is always required
to blow the solvent line dry after the cleaning
operation. Typical bell speed during the cup
flush sequence is 30,000 rpm. Follow sequence
as outlined for cup wash in "General Operating
Sequence" in the "Operation" section.
External Atomizer Surface
Cleaning
• Verify that the high voltage is turned off.
• All external surfaces may be cleaned using a
mild solvent and lint free rags to hand wipe
the RMA-303 Turbine drive air must be off,
but leave bearing air on. The shaping air
should have approximately 70 slpm air flow
through each to prevent the solvent from en-
tering these passages.
• Do not spray the RMA-303 unit with a solvent
gun used for cleaning. The cleaning fluid
under pressure may aid conductive materials
to work into hard to clean areas or may allow
fluids to be forced into the turbine assembly.
• Do not reuse an atomizer bell cup that shows
any sign of damage such as nicks, heavy
scratches, dents, or excessive wear.
• Always final wipe all parts with a non-polar
solvent and wipe dry (high flash Naphtha,
etc.).
Ransburg
LN-9263-08.5