Ransburg MMA-303 Direct_Ind Charge Atomizer A12870 - Manual (Page 100)

MMA-303 Direct/Indirect Charge - Maintenance
97 LN-9269-11.3
TROUBLESHOOTING GUIDE—DIRECT CHARGE
General Problem Possible Causes Corrective Action
Bad Spray Pattern 1. Bell cup damaged 1. Replace bell cup.
2. Low voltage 2. See "Low or No High Voltage" below.
3. Paint lodged in shaping 3. Disassemble and clean
air ring (see "Maintenance" section).
Low or No High 1. High current draw 1. a. Paint resistivity to be .1 M W to h .
Voltage b. Replace coiled fluid line.
2. Solvent valve is actuated 2. Remove solvent valve air pilot signal (high
voltage must be interlocked with the solvent
valve air pilot signal to prevent solvent flow
while high voltage is energized).
3. Loss of low voltage cable 3. a. Remove atomizer and inspect low voltage
connection between robot
and
connections on both plates. Verify
bell plates alignment marks between connectors and
plates and verify that connector face is
flush with plate. Verify that set screws are
secure, but not too tight, as this will pre-
vent the spring-loaded pins on the robot
plate from extending and making contact.
b. Faulty low voltage cable.
4. Improperly mounted air 4. Verify correct orientation of air turbine so
turbine that high voltage spring makes contact with
metal pad on turbine assembly.
5. Improper limiting current and 5. To readjust settings, refer to "MicroPak"
voltage settings operating manual.
high voltage parts
6. Atomizer grounding out 6. a. Clean atomizer externally with non-polar
(usually indicated by high solvent.
current draw or by MicroPak b. Check the atomizer externally with non-
over-current fault light) polar solvent.
c. Check for fluid leaks at quick disconnect
mounting (between bell plate and robot
plate).
d. Check for internal arcing (usually
indicated by internal sparking sounds).
e. Make sure cascade low voltage connection
is properly shielded.