Ransburg Serial Atomizer Module A11925-00 - Manual (Page 12)

LN-9256-07.4
OPERATION
Serial Atomizer Module - Operation
9 9 9 9 9
> Since the Serial Atomizer Module may
be used as a replacement part in systems
where bearing air sensing is done outside
the module or is not required, a zero thresh-
old setting is available as indicated in Figure
5. This setting may also be used in trouble-
shooting system pneumatic problems. It
must never be used in systems which de-
pend on the Serial Atomizer Module for bear-
ing air interlock. If the threshold is set for
zero and the atomizer loses bearing air
pressure, the turbine could suffer severe
damage.
C A U T I O N C A U T I O N C A U T I O N C A U T I O N C A U T I O N
!!!!!
A pneumatic input is provided and required for
atomizer bearing air sensing and interlock. Bearing
air pressure thresholds of 60, 70, and 80 psi are
set by configuration of module switch SW2-7 and
8. These settings are detailed in Figure 3b. (See
(See (See (See (See
Caution below.) Caution below.) Caution below.) Caution below.) Caution below.)
The maximum allowed speeds for various rotator
types is shown in the "Specifications" in the
"Introduction" section. There are no minimum
speed limits set by the serial module itself, however,
the low speed operation is limited by the drop out
of speed feedback at about 2 krpm.A speed control
system example is shown in Figure 3.
SPEED CONTROL SPEED CONTROL SPEED CONTROL SPEED CONTROL SPEED CONTROL
The Serial Atomizer Module Serial Atomizer Module Serial Atomizer Module Serial Atomizer Module Serial Atomizer Module is used in a
closed-loop rotational speed control system for
rotary atomizers. It accepts a requested speed
command and, after comparing this with the actual
speed feedback from the atomizer, provides an
output to maintain the requested speed.
When a speed request is received, the DRIVE
solenoid on the module is activated and the module
provides an air pilot signal to a 1:1 volume booster,
such as Ransburg part number 11213-06. The
front panel DRIVE LED is also activated. The
volume booster supplies high volume drive air to
the rotary atomizer.
The atomizer speed is monitored by a fiber optic
cable to a fiber optic transceiver, such as the
Ransburg part number 10979-04. The transceiver
then provides a differential speed feedback signal
to the serial atomizer module. The speed, in
increments of 1000's rpm, is displayed on the
module front panel.
An optional braking system can be incorporated
to allow rapid speed changes. When changing
speeds from high to low (change greater than
3,000 rpm), the module provides a brake pilot
pneumatic output to a 3-way valve such as the
Ransburg part number 11678-01. The 3-way
valve supplies high volume air to the Rotary
Atomizer brake input. The BRAKE LED on the
front panel is also activated.
Note that when the speed is commanded to Note that when the speed is commanded to Note that when the speed is commanded to Note that when the speed is commanded to Note that when the speed is commanded to
zero, the brake is not activated and the
zero, the brake is not activated and the zero, the brake is not activated and the zero, the brake is not activated and the zero, the brake is not activated and the
rotator simply coasts to a stop.
rotator simply coasts to a stop. rotator simply coasts to a stop. rotator simply coasts to a stop. rotator simply coasts to a stop. For faster
stoppage of rotation using the brake function, one
should provide a 1 krpm setpoint. The Serial
Atomizer Module recognizes this as an emergency
stop condition and will cause the brake to operate
until the speed reach 2 krpm from where the
rotator will coast to a stop. The speed feedback
will drop out at about 2 krpm and the module will
set a Loss of Feedback Fault. Any new speed
command will reset this fault.