Ransburg MMA-303 Direct_Ind Charge Atomizer A12870 - Manual (Page 60)

MMA-303 Direct/Indirect Charge - Operation
57 LN-9269-11.3
BRAKE AIR
Brake air is used to slow the turbine speed in
a minimum length f time. It is advantageous
for short cycle times during color change, or
may be used to reduce speed or stop the tur-
bine. never operate brake air with the turbine
air on.
Approximate brake times to reduce the turbine
speed are shown in “Deceleration Time Chart”
in the “Introduction” section. These times are
based on 60 psi (413.7 kPa) and 100 psi (689
kPa) air pressure at the back of applicator.
ELECTROSTATIC VOLTAGE
The MMA-303 Indirect Applicator receives a
low voltage control input from the MicroPak to
control the operating electrostatic voltage.
(Refer to the current MicroPak manual for de-
tailed Operating Instructions.) Refer to the
current MicroPak service manual for detailed
operating instructions, safety cautions, and
settings.
If paint defects occur, such as fatty edges or
picture framing, reducing the voltage should
be a last resort. To correct the problem, lead
and lag trigger adjustments should be opti-
mized first.
The electrostatic voltage applied to the MMA-
303 will affect pattern size, transfer efficiency,
wrap and penetration into cavity areas. A set-
ting of 30-70 kV is appropriate for most direct
charge applications and 30-70 kV for most
indirect charge applications..
N O T E
TARGET DISTANCE
The distance between the MMA-303 atomizer
and the target will affect the finish quality and
efficiency. Closer distances give a smaller
pattern, wetter finish, and greater efficiency.
Greater distance will provide a large pattern
size and drier finish. The MicroPak control
circuit will enable the applicator bell to be op-
erated to within a few inches of the target with-
out adjusting the voltage setting. The recom-
mended target distance is 6 to 12-inches
(152.4-304.8mm). In general, allow 1-inch
(25.4mm) target distance for every 10kV.