Ransburg RMA Indirect A12869 - Manual (Page 36)

RMA-303 Indirect Charge - Installation
31 LN-9268-11.4
piercing the structural component enough
to assure connection. All ground connec-
tions should be made to the most conduc-
tive metallic structural ground available.
To be sure that everything is properly ground-
ed, 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
INSTALLATION, CORRECT OPERATION
AND GOOD HOUSKEEPING
. Daily inspec-
tion of grounding apparatus and conditions,
however, will help prevent 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 opera-
tions.
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 cooling 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 condensation on the interior and exterior
of the atomizer, machine, and its compo-
nents. It is even possible that the tempera-
ture of the supply air may be below the booth
dew point, even without additional expansion
cooling.
Condensation is especially probable in wa-
terborne applications when booth tempera-
ture 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 ex-
haust 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. The air heaters must be of sufficient ca-
pacity, 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 de-
pends on applicator fluid flow rate load,
booth conditions, turbine airflow settings,
and incoming air temperature. The heater
should be set as low as possible, sufficient to