Control
Board
4-10
serial
port.
The serial
port
is configured to 9600
baud,
8
data
bits, 1
stop
bit,
with
no
parity. This
timing
is
derived
from the
main
microcontroller
oscillator frequency
of
11.0592 MHz.
The control
board
serial
port
signals connect to
the
Power
Supply
/
RF
board
through
the
96-pin connector. The signals
are
then
connected to
the
9-pin
serial
port
connector
on
the
Power
Supply
/RF
board.
Dosage
Error
Algorithm
Dosage
Error
Algorithm
for
Closed-Loop
Modes
The
dosage
error
algorithm
for
the
dosed-loop
modes
(bipolar
and
cut) is
based
on
a
comparison
between
the
actual
power
as
calculated
by
the
main
microcontroller (US) using
the
backup
sensors
and
the
maximum
allowed
power.
While
the
feedback microcontroller is
operating
the
generator
output,
the
main
micro controller calculates
and
checks
the
values
to
make
sure
the
feedback microcontroller is
operating
the
generator
properly.
In
a
dosed
loop
mode,
there is a 500
ms
delay
before
the
dosage
error
algorithm
monitors
the
RMS
output
of
the
generator. After
the
delay,
the
algorithm
first checks
to
see
that
the
voltage, current,
and
power
calculated
by
the
backup
sensors
are
less
than
125%
of
the
value
calculated
by
the
primary
sensors.
On
passing
this test,
the
feedback
mode
of
the
generator
is
taken
into
account.
•
In
current
control
mode,
the
current
calculated
by
the
backup
sensors
is
not
allowed
to
deviate
from
the
current
calculated
by
the
primary
sensors
by
more
than
50%
of
the
value
calculated
by
the
primary
sensors.
•
In
voltage control
mode,
the
voltage calculated
by
the
backup
sensors
is
not
allowed
to
deviate
from the voltage calculated
by
the
primary
sensors
by
more
than
50%
of
the
value
calculated
by
the
primary
sensors.
During
dosed
loop
activation,
the
main
microcontroller continually
checks for
broken
backup
sensors. The
current
and
voltage
sensor
analog
values
are
compared
to
the
previous
readings to
ensure
that
the
sensor
values
are
not
constant
or
falling
while
ECON
is rising.
When
the
generator
drops
into
spark
control,
the
software
makes
allowances for
the
shift
in
frequency.
The
voltage
sensor
returns
a
value
that
is
approximately
20-25% high,
and
the
rms
value
calculated for
the
voltage
sensor
is
reduced
by
25%. The
current
sensor
returns
a
value
that
is
approximately
10-15% low,
and
the
rms
value
calculated for
the
current
sensor
is
increased
by
12.5%.
The
dosage
error
algorithm
for
the
open
loop
modes
(coag)
is
based
on
the
ECON
calculated for
the
mode.
The
main
microcontroller calculates
an
ECON
that
represents
125%
of
the
front
panel
power
setting
and
verifies
that
SYS_ECON
and
HV
_SEN
do
not
exceed this
value
while
the
generator
is activated.
Force
FXTM-C
Service
Manual
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