Opera, Opera operation tion tion tion tion, Fluid flow ra – Ransburg Aerobell M Rotary Atomizer 78101 User Manual

Page 18

LN-9237-00.1

Aerobell M Rotary Atomizer - Operation

Operators must be fully trained in safe

operation of electrostatic equipment.
Operators must read all instructions and
safety precautions prior to using this
equipment (See NFPA 33, Chapter 16).

OPERA

OPERATION

TION

As with any spray finishing system, operation of
the Aerobell M involves properly setting the op-
erating parameters to obtain the best finish
quality for the coating material being sprayed,
while maintaining correct operation and reliabil-
ity of the equipment used. Adjustments to oper-
ating parameters, which cover spraying, clean-
ing and on/off control, include:

• Coating Materials
• Fluid Flow Rate Control
• Fluid Valve Control
• Turbine Speed
• Bearing Air Adjustment
• Shaping Air
• Brake Air
• Electrostatic Voltage
• Target Distance

COA

COATING MA

TING MA

TING MATERIALS

TERIALS

The Aerobell M can be used with a full range of
coating material conductivities. However, with
coatings having very high conductivities, such
as waterborne paints, it may be necessary to
isolate paint supply from ground.

Electrical discharge of a high electrical

capacitance fluid/paint system can cause
fire or explosion with some materials. If
arcing occurs when a specific coating
materials is used, turn the system off and
verify that the fluid is nonflammable. In
these conditions the system is capable of
releasing sufficient electrical and thermal
energy to cause ignition of specific haz-
ardous material in air.

FLUID FLOW RA

FLUID FLOW RATE

CONTROL

Fluid flow is controlled by an internally mounted
dual diaphragm fluid regulator. Reference the
LREG5001, DR-1

Plastic Fluid Regulator,

Manual# LN-9221-00 (latest version) for
detailed information.

The regulator features two independently con-
trollable flow pressure ranges from the fluid
output port. The high flow range port accommo-
dates higher fluid deliveries thereby providing
increased film build capabilities and minimal
color change times. The low flow range pro-
vides precise fluid delivery control. There are
seven low range models available (1:1, 1:2, 1:3,
1:4, 1:6, 1:8, and 1:10) which can be selected
based on the required fluid flow rate.

Separate pilot signals modulate each of the
regulator’s two diaphragms to control the
amount of paint being delivered from the regula-
tor to the atomizer bell cup. These pilot signals
can be controlled manually or automatically with
closed loop flow control system.

Because of the regulator’s dual range capabili-
ties, it provides the user flexibility of selecting
either the high flow range or the low flow range.
Different coating material viscosities and quick
color change requirements may necessitate the
use of both ranges. If color change time is not a
factor or if material viscosity remains relatively
constant, either port may be used depending on
flow rate requirements.

The high flow port characteristics are similar to
those found in most commercially available, air
operated fluid regulators. Fluid regulation from
the high flow port is therefore comparable in to-
tal flow capacity, although consistency of flow is
improved considerably when using a regulator.
All regulators, regardless of ratio designation,
have the high flow port.

The low flow (i.e. 1:2, 1:4, etc.) port provides a
lower, more precise flow response curve. Fluid
output, as a result, is less likely to be affected
by pilot signal errors. An increase in the ratio

W A R N I N G

!!!!!

W A R N I N G

!!!!!