Ransburg RMA-560 Single_Dual Purge Direct A13364 - Manual (Page 72)

Faulty low voltage connections
(Usually indicated by MicroPak
feedback fault light)
Faulty high voltage connection
MicroPak or cascade failure
Improper color change (i.e., paint
or solvent in dump line)
Low or no high voltage
Poor grounding of parts being
coated
Excessive turbine speed
Excessive inner/outer shaping air
Excessive target distance
Turbine drive air not present
Bearing air return signal notpresent
Brake air is activated
TROUBLESHOOTING GUIDE
(Cont.)
General Problem Possible Cause Solution
Low or No High
Voltage (Cont.)
Low Transfer
Efficiency (or
light coverage)
No Turbine Air
Make sure quick disconnect electrical con-
nection is aligned and clean.
a. Check low voltage connection at cascade.
Remove cascade and check continuity be-
tween cascade connection and turbine shaft.
Refer to “MicroPak” service manual for
detailed “Troubleshooting Guide”.
Optimize color change.
Verify high voltage at bell cup edge. Nor-
mally a high voltage setting of 70-100 kV
is appropriate for most applications.
Verify that parts being coated are properly
grounded (the electrical resistance between
the part and ground must not exceed 1
megohm).
For optimum transfer efficiency and spray
pattern control, the bell rotational speed
should be set at the minimum required to
achieve proper atomization of the coating
material.
Shaping air should be set at the minimum
volume required to gently direct the spray
pattern toward the part being coated.
Excessive shaping air will cause some
atomized particles to “blow-by” the part or
bounce back onto the atomizer.
The recommended target distance is be-
tween 6-12 inches (152.4-304.8 Nm) (see
“Target Distance” in the “Operation” section
of this manual).
Verify supply air pressure.
a. Verify bearing air return signal.
b. Increase bearing air supply pressure to
90 psig (± 10 psig) (620.5 ± 68.9 kPa).
Remove brake air signal (turbine air and
brake air must be interlocked to prevent
both from being used simultaneously).
RMA-560 Single/Dual Purge Direct Charge - Maintenance
Ransburg
LN-9278-13 69