Ransburg Aerobell 33 AER5000, AER5001 - Manual (Page 32)

Aerbell 33 Rotary Atomizer - Maintenance
Ransburg
28 LN-9521-00.4
LOW VOLTAGE TEST
When replacing the resistive components, trouble-
shooting, reassembling or as periodic inspection
procedure, a "low voltage" test can be performed
on the rotator assembly to ensure that there are
good electrical contacts and that the resistors are
not defective. A high voltage resistortester (Meg-
ger) must be used which has an output voltage of
500 to 1000 VDC.
1. With the high voltage turned OFF, disconnect
the high voltage cable from the rear of the rotator
assembly.
2. Insert a test cable or the test meter probe into
the rear of the rotator and connect to the voltage
output of the test meter.
3. Remove the front shroud and bell cup and clip
the test meter ground to the rotator shaft.
4. Set the test meter voltage output to a minimum
of 500 VDC and maximum of 1000 VDC.
5. The meter should indicate between approxi-
mately 725 Megohm and 770 Megohm. If the test
instrument is reading higher than 770 Me-gohm,
then the electrical contacts between the resistor
tube, resistor block and motor assembly need to
be checked.
6. Remove the motor assembly and resistor tube
and verify that the resistor tube springs are at
least 3/8" and are not distorted. Also make sure
that there is no visible contamination in the motor
cavity where the resistor tube inserts.
Refer also to the "Troubleshooting Guide" (Figure
15).
DISASSEMBLY
PROCEDURES
Make sure the following conditions exists prior to
disassembly:
• Pay particular attention to the procedures and
Warning information, outlined under "Cleaning
Procedures", prior to performing any mainte-
nance.
† For reassembly instructions, use the
reverse of the following disassembly pro-
cedures.
NOTE
• The air to all supply and pilot lines is off.
• The high voltage power supply has been shut off.
• The atomizer’s valves, feed tube, bell cup and
fluid supply lines have been cleaned with solvent
and purged dry with air.
• The bell cup has stopped rotating.
• All external surfaces must be clean and free of
paint or paint residue.
Front Shroud Removal
Remove the front shroud (Figure 16a, item 2) from
the atomizer, using the RPM-419, or other properly
fitting spanner wrench, and turning CCW (viewed
as facing the front end).
Note that when the front shroud is removed, the
shaping air cap (Figure 16a, item 13) is removed
with it. The Aerobell 33 turbine (Figure 16a, item
10) and the bell assembly (Figure 16a, item 16)
will now be exposed.
Using the same wrench, it is also possible to sepa-
rate the shaping air cap from the front shroud. This
is much easier to do if the front shroud is mounted
on the turbine assembly, since it is difficult to grasp
the shroud and the wrench simultaneously if the
parts are removed from the mechanical support
of the assembly. Hold the front shroud stationary
while turning the shaping air ring CCW. Note
that it is only necessary to separate these parts
if replacing one of them, or for thorough cleaning.
When installing the front shroud onto the turbine
assembly, be sure that it is fully tightened. The
shroud will appear tight after a few turns, but will
still be loose. The shroud can then be tightened
down fully until it bottoms against the air manifold
assembly.