Ransburg RPA-2 Powder Applicator A12950-XXX - Manual (Page 17)

RPA-2 POWDER APPLICATOR - Operation
LN-9271-12.2 14
OPERATION
Make sure that all electrostatically con-
ductive parts within 5 meter of the spray
booth are grounded!
!
W A R N I N G
GENERAL OPERATION
There are several variables that need to be con-
sidered when using this applicator. Each one influ-
ences the operation. They are:
1. High voltage affects how much the powder is
charged. If the kV is set too high, defects will
appear. If the kV is set too low, then the pow-
der will not charge and will not stick to the sub-
strate.
2. Shaping air is used to control pattern size.
With high amounts of shaping air, the air will
propel the powder particles quickly towards
the target. This may reduce transfer efficiency.
a. Round Spray– Electrode rinsing air pro-
vides a cushion of air in front of the deflec-
tor and assists in keeping its front face
clear. This s usually set at 45-50 SLPM.
b. Open Bore Nozzle- set electrode rinsing
air 8-10 SLPM. The air helps keep the
electrodes clean.
3. Cascade air is used to ventilate the inside of
the applicator. The normal setting is between
25 and 50 SLPM.
4. Target distance between the applicator and
substrate will influence how big the pattern is.
A good starting point is 8-inches.
5. Robot arm speed (TIP speed) is used to influ-
ence the rate at which powder is applied.
6. Powder flow rate is the primary influencer of
the rate at which powder can be applied.
START—UP
Adjusting the Powder Out-
put /Powder Cloud
The powder output depends on the powder
type, the powder hose length, the powder
hose diameter, and the powder pump. The
RPA-2 applicator can be used in connection
with Venturi pumps and dense phase pumps
like (i.e. powder pressure pump).
The operating principle of the injector and the
different powder pumps is explained in their
corresponding operating manuals.
1. Switch on the power supply.
2. Adjust the powder output.
3. Adjust the shaping air, so that the form of
the powder cloud corresponds to the de-
sired size. A good initial setting is 20
SLPM.
4. Adjust the dilution air ( if powder applica-
ble) so that the form of the powder cloud is
uniform. A good initial setting is 90 SLPM.
Lowest dilution air setting will be above 40
SLPM.
5. Adjust the electrode rinsing air flow, so
that the desired form of powder cloud is
not impaired. A good initial setting is 50
SPLM.
6. Switch high voltage on the control unit.
(See applicable service manual for opera-
tion of high voltage controls.)
7. A good initial voltage setting is 60 kV set
point for voltage or current control.
8. Trigger kV and Powder OFF.