Ransburg RMA Dual Purge Direct A12300 - Manual (Page 83)

RMA-303 Dual Purge/Direct Charge - Maintenance
78
General Problem Possible Causes
Low or No High
Voltage (Cont.)
Low Transfer
Efficiency (or light
coverage)
No Turbine Air
7. Faulty low voltage connec-
tions (usually indicated by
MicroPak feedback fault
light)
8. Faulty high voltage
connection
9. MicroPak or cascade
failure
10. Improper color change
(i.e., paint or solvent in
dump line)
1. Low or no high voltage
2. Poor grounding of parts
being coated
3. Excessive turbine speed
4. Excessive inner/outer
shaping air
5. Excessive target distance
1. Turbine drive air not
present
2. Bearing air return signal
not present
7. a. Make sure quick disconnection electrical
connection is aligned and clean.
b. Check low voltage connection at cascade.
8. a. Remove cascade and check continuity be-
tween cascade connection and turbine shaft.
9. Refer to "MicroPak" service manual for de-
tailed "Troubleshooting Guide".
10. Optimize color change.
1. Verify high voltage at bell cup edge. Normally,
a high voltage setting of 70-100kV is appropri-
ate for most applications.
2. Verify that parts being coated are properly
grounded (the electrical resistance between
the part and ground must not exceed
1 megohm).
3. For optimum transfer efficiency and spray pat-
tern control, the bell rotational speed should
be set at the minimum required to achieve
proper atomization of the coating material.
4. 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.
5. The recommended target distance is between
6-12-inches (152.4-304.8 Nm) (see "Target
Distance" in the "Operation" section of this
manual).
1. Verify supply air pressure.
2. a. Verify bearing air return signal.
b. Increase bearing air supply pressure to
90 psig (±10 psig) (620.5 ± 68.9 kPa).
(Continued On Next Page)
Troubleshooting Guide (Cont.)
Ransburg
LN-9263-08.5