Ransburg PulseTrack2 A11515-XXXXX - Manual (Page 31)

OPERATION
THEORY OF OPERATION
Speed Control
When the rotator is spinning, the fiber optic cable
sends pulses of light back to the Fiber Optic Re-
ceiver Module located in the PulseTrack 2 control
panel. The Fiber Optic Receiver Module converts
these light pulses to electrical pulses which are
then sent to the microcontroller. From these
pulses, the microcontroller determines the actual
speed at which the rotator is currently spinning.
This speed is then subtracted from the speed
setpoint to create an error. The error is added
to the present drive and output to the Current to
Pressure (I/P) Transducer as a 4-20 mA signal. The
I/P transducer outputs a 0 - 100 psi pilot pressure
signal proportional to its’ 4-20mA input, to the 1:1
volume booster. The volume booster produces a
high flow output pressure to the rotator turbine that
is equivalent to the pilot input pressure received
from the I/P transducer. In this manner, a speed
output that is lower (higher) than the setpoint
creates a positive (negative) error that increases
(decreases) operating pressure to the rotator, until
the setpoint speed is reached.
Optional Brake Control
(Bells Only)
When the speed setpoint of a bell is decreased
or speed control is disabled (Control Card dip
switch SW1-1 ON) the microcontroller turns on the
corresponding Brake Solenoid. The output of the
brake solenoid is supplied as a pilot signal to the
A11547 Brake Valve Assembly. The pilot input of
the high flow Brake Valve Assembly causes it to
turn on and pass it’s input pressure to its output.
The output of the Brake Valve Assembly is then
directed against the rotator vanes causing it to
decrease speed more quickly than if no brake
signal was used. Once the rotator reaches the
desired speed, the microcontroller turns off the
Brake Solenoid.
Optional Temperature/Humidity
Control
The temperature/humidity probe contains trans-
ducers that convert humidity and temperature
data to 4-20mA signals. These signals are then
sent back to the microcontroller where they are
processed and displayed on the Temperature/
Humidity Card.
FRONT PANEL
CONTROLS
(See Figure 12)
Power ON/OFF Switch
This green switch turns AC power to the Pulse-
Track 2 control panel on or off. It lights up when
AC power is being supplied.
Master Control Switch
When the Master Control switch is in the STOP
position, speed control to all rotators is disabled,
regardless of other switch settings. Speed con-
trol cannot be enabled for any rotator unless this
switch is in the RUN position.
Master Reset Switch
This switch is used to reset faults that occur on
any rotator.
Speed Fault Indicator
This red light illuminates when a fault condition
exists on any rotator. It remains illuminated until
the fault condition is reset.
Speed Fault Horn
The Speed Fault Horn sounds when a fault con-
dition exists on any rotator. It remains on until the
fault condition is reset.