Ransburg RMA Indirect A11600 - Manual (Page 29)

To be sure that everything is properly grounded,
the following steps should be undertaken at least
daily:
1. Inspect all ground wires. Look for good, firm
joints at all points of connection. Look for breaks in
the ground wire. Repair all defects IMMEDIATELY!
2. Inspect the floor or grates for excessive
accumulation of dried coating material or other
residue. If there is any, remove it!
SAFE GROUNDING IS A MATTER OF PROPER
EQUIPMENT MAINTENANCE AND INSTAL-
LATION, CORRECT OPERATION AND GOOD
HOUSKEEPING. Daily inspection of grounding
apparatus and conditions, however, will help pre-
vent hazards that are caused by normal operations.
BE SURE THAT:
1. All objects in the spray area are grounded.
2. Personnel in the spray area are properly
grounded. (Conductive safety shoes, and
coveralls.)
3. That the target object is properly grounded
(less than 1 megohm resistance).
4. That the high voltage is off except during
normal application.
5. That the high voltage is off and applicators
are grounded during maintenance operations.
6. The spray area is kept free of accumulated
coating deposits.
7. All combustible liquids in the spray area
(outside of automatic delivery systems) are kept
to minimum and are kept in fire safe, grounded
containers. (See NFPA-30 and chapter 6 of
NFPA-33.)
8. Proper ventilation is provided.
9. Personnel must thoroughly understand the
equipment, its operation and maintenance, and
all safety precautions.
AIR HEATER
REQUIREMENTS
Turbine drive air expands as it moves through the
turbine wheel cavity and as it exits the turbine from
the exhaust port. This expansion will cause cool-
ing of the exhaust air and the surfaces it contacts.
This same expansion cooling can occur across
the shaping air exit ports. This cooling effect can
cause surface temperatures to fall below the dew
point of the booth, which will result in condensa-
tion on the interior and exterior of the atomizer,
machine, and its components. It is even possible
that the temperature of the supply air may be be-
low the booth dew point, even without additional
expansion cooling.
Condensation is especially probable in waterborne
applications when booth temperature and relative
humidity levels are typically maintained very high.
This condensation will allow sufficient conductivity
of the surfaces such that they act as an erratic
ground source potential. This can cause damage
to the equipment.
It is therefore, a requirement that turbine exhaust
air temperature be maintained above the booth
dew point to prevent condensation from forming
on atomizer surfaces. Doing so will eliminate
moisture as a potential defect in painted surfaces
as well as extending equipment life. Thus, it is
recommended that air heaters be installed into
the atomizer air supply lines, i.e. turbine drive air,
shaping air, and seal air. The air heaters must
be of sufficient capacity, capable of raising the
incoming air temperature at least 40°F (4.4°C) at
a flow rate of 60 SCFM per applicator.
The actual air heater process setting depends on
applicator fluid flow rate load, booth conditions,
turbine airflow settings, and incoming air tempera-
ture. The heater should be set as low as possi-
ble, sufficient to maintain the applicator surface
temperatures above the dew point in the booth.
RMA-303 Indirect Charge - Installation
Ransburg
25 LN-9252-06.4