Ransburg RMA Direct A12867 - Manual (Page 62)

RMA-303 Direct Charge - Maintenance
59 LN-9266-11.3
pends 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).
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 external solvent valve to allow cleaning
solvent to flow through the manifold passag-
es, 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 opera-
tion. 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.
! C A U T I O N
•
The maximum flow rate of 700 cc/min. must
not be exceeded during a flush routine. Use
of an in-line fluid restrictor is recommended.
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 inner
and outer shaping air (if applicable) should
have approximately 70 slpm air flow
through each to prevent the solvent from
entering these passages.
•
Do not spray the RMA-303 unit with a sol-
vent applicator used for cleaning. The
cleaning fluid under pressure may aid con-
ductive 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.
•
For best operating conditions, the atomiz-
er surfaces must be dry.
•
Always final wipe all parts with a non-polar
solvent and wipe dry (high flash Naphtha,
etc.).
!
W A R N I N G
•
NEVER wrap the applicator in plastic to
keep it clean. A surface charge may build
up on the plastic surface and discharge to
the nearest grounded object. Efficiency of
the applicator will also be reduced and
damage or failure of the applicator compo-
nents may occur. WRAPPING THE APPLI-
CATOR IN PLASTIC WILL VOID WARRAN-
TY.
! W A R N I N G
•
To reduce the risk of fire or explosion,
OSHA and NFPA-33 require that solvents
used for exterior cleaning, including bell
cleaning and soaking, be nonflammable
(flash points higher than 100°F/
37.8° C).
Since electrostatic equipment is involved,