Ransburg MMA-570 Direct_Ind Charge Atomizer A13366 - Manual (Page 79)

TROUBLESHOOTING GUIDE - DIRECT CHARGE
Bell cup damaged
Low voltage
Paint lodged in shaping air ring
High current draw
Solvent valve is actuated
Loss of low voltage cable
connection between robot and
bell plates
Improperly mounted air
turbine
Improper limiting current and
voltage settings high voltage parts
Atomizer grounding out (usually
indicated by high current draw or by
MicroPak over-current fault light)
Replace bell cup.
See “Low or No High Voltage” below.
Disassemble and clean
(see “Maintenance” section).
a. Paint resistivity to be .1 MW to h.
b. Replace coiled fluid line.
Remove solvent valve air pilot signal
(high voltage must be interlocked with
the solvent valve air pilot signal to pre-
vent solvent flow while high voltage is
energized).
a. Remove atomizer and inspect low volt-
age 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 prevent the
spring-loaded pins on the robot plate
from extending and making contact.
b. Faulty low voltage cable.
Verify correct orientation of air turbine so
that high voltage spring makes contact
with metal pad on turbine assembly.
To readjust settings, refer to “MicroPak”
operating manual.
a. Clean atomizer externally with non-po-
lar solvent.
b. Check the atomizer externally with
non-polar solvent.
c. Check for fluid leaks at quick discon-
nect mounting (between bell plate and
robot plate).
d. Check for internal arcing (usually indi-
cated by internal sparking sounds).
e. Make sure cascade low voltage con-
nection is properly shielded.
General Problem Possible Cause Solution
Bad Spray Pattern
Low or No High
Voltage
MMA-570 Direct/Indirect Charge - Maintenance
Ransburg
LN-9279-13 76