COMDYNA GP-6 User manual

OPERA
TOR'S & MAINTENANCE
MANUAL
GP-6ANALOG
COMPUTER
OPERATOR'S
MANUAL
305
Devonshire
Road,
Barrington,
IL
60010,
tel &
fax
847/381-7560
'----------------------------COM
DYNA,
INC.

OPERATOR'S
&
MAINTENANCE
MANUAL
GP-6
ANALOG
COMPUTER
Operators
&
Maintenance
Manual
TABLE
OF
CONTENTS
SECTION
1.
GP-6
OPERATING
PROCEDURES
page
1.0
Connection
of
External
Readout
Instruments
............
1.
1.1
Calibration
of
Readout
Instruments
...............
1.
1.2
Setting
Coefficient
Potentiometers
. . . . . . . . . . . . . . .
2.
1.3
Setting
the
Compute
Time
Period
. . . . . . . . . . . . . . .
2.
1.4
Static
Measurements
. . . . . . . . . . . . . . . . . . . . . .
3.
1.5
Problem
Solution
. . . . . . . . . . . . . . . . . . . . . . .
3.
1.6
Slaving
Two
or
More
Units
. . . . . . . . . . . . . . . . . . .
4.
1.
7
Overrange
of
Amplifier
Outputs
. . . . . . . . . . . . . 4.
1.8
Power
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
4.
SECTION
2.
GP-6
OPERATOR
FUNCTIONS
2.0
GP-6
Operator
Functions
(schematic)
. . . . . . . . . . . .
5.
2.1
Y/Pot
Address
..........................
5.
2.2
X
Address
............................
6.
2.3
Mode
Control
. . . . . . . . . . . . . . . . . . . . . . . . . .
6.
2.4
Mode
Selector
. . . . . . . . . . . . . . . . .
6.
2.5
Compute
Time
. . . . . . . . . . . . . . .
..
7.
2.6
Coefficient
Potentiometers
. . . . . . . .
..
7.
2.
7
Overload
Indicator . . . . . . . . . . . . .
7.
2.8
Digital
Voltmeter
. . . . . . . . . . . .
.......
7.
2.9
Rear
Terminals
. . . . . . . . . . . . . . . . . . . . . . . . . .
8.
2.10
Interface
Connector
.......................
8.
SECTION
3.
GP-6
PATCH
PANEL
Patch
Panel
Layout
and
Description
. . . . . . . . . . . . . . . . . . .
9.
Patch
Panel
Operations
Summer
............................
11.
Inverter
. . . . . . . . . . . . . . . . . . . . . . . . . . .
11.
Integrator . . . . . . . . . . . . . . . .
12.
AttenuatorNoltage
Divider
. . . . . . . . . . . . . . . .
12.
Multiplier/Divider
. . . . . . . . . . . . . . . . . . . . . .
13.
Squarer/Square
Root
Extractor
. . . . . . . . . . . . . . . .
13.
Differentiator
. . . . . . . . . . . . . . . . . . . . . . . . . .
14.
Track/Store
..........................
14.
Single
Pole,
Double
Throw
Electronic
Switch
. . . . . . . .
14.
CIRCUIT
DIAGRAMS
APPENDICES
----------------------------------COM
DYNA,
INC.

OPERATOR'S
&
MAINTENANCE
MANUAL
GP-6
OPERATING
PROCEDURES
1.0
CONNECTION
OF
EXTERNAL
READOUT
INSTRUMENTS
The
GP-6
offers
a
choice
of
slow
and
fast
time
scales.
Slow
time
outputs
are
normally
recorded
with
an
XY
plotter
or
strip
chart
recorder;
fast
time
outputs
are
normally
displayed
by
an
oscilloscope.
A
time
base
is
provided
and
should
be
used
wherever
possible
as
the
X
input
to
an
XY
plotter
or
XY
oscilloscope.
Use
of
the
interal
time
base
offers
two
advantages.
1.
The
time
base
is
calibrated
to
match
the
integrator
time
scales.
2.
It
sweeps
across
a
fixed
range
of
co-
ordinates
regardless
of
the
time
period
being
plotter
or
displayed.
~
~
y:('"'t-
___
....,.
C[]
GP-6
X
OUTPUT
..-----Y
OUTPUT
Time
Base
---+---
Amplifier
Outputs
Y/POT
ADDRESS
Figure
1-1
XADDRESS
*Note:
Rear
terminals
OP
INPUT
and
OP
OUTPUT
must
be
connected
for
normal
operation.
(See
para
1.6)
Rear
binding
post
terminals
offer
convenient
connections
to
the
X
and
Y
inputs
of
the
plotter and/or
oscilloscope.
The
three
connections
are
shown
in
Figure
1-1
and
listed
below.
1.
GND
...
signal
ground.
2.
Y
OUTPUT
...
selection
of
the
Y
ADDRESS
switch,
to
be connected
as
the plotter and/or
oscilloscope vertical input.
3.
X
OUTPUT
...
selection of the X ADDRESS
switch,
to
be
connected
as
the horizontal
input.
Note:
If
the
oscilloscope's
internal
time
base
and
external
trigger
is
to
be
used
for
display
of
high
speed
repetitive
outputs,
it
will
be
convenient
to
connect
its
external
trigger input
to
the
OP
OUTPUT
rear
terminal.
1.1
CALIBRATION
OF
READOUT
INSTRUMENTS
The
range
and
zero
position
of
a
plotter
or
oscilloscope
should
be
selected
and
positiooned
so
that
their
full
scale
horizontal
and
vertical
axes
span
the
GP-6
minus
and
plus
ten
volts
reference.
(Fig.
1-2.)
+RE
t-
Y
AXIS
0
-RE
F
..
-
-REF
_ __.v
0
X
AXIS
~
--
+REF
Positive
Full
Scale
Co-ordinate
Center
Position
Negative
Full
Scale
Co-ordinate
Figure
1-2
page
1.
--------------------------------------CO
MOYNA,
INC.

OPERATOR'S
&
MAINTENANCE
MANUAL
page
2.
The
following
are
procedures
for
input
scaling
adjustments:
1.
Position the
MODE
SELECTOR switch to OPR.
2.
Depress the IC mode control push button.
3.
Position boththe Y/POTADDRESS and X ADDRESS switches to GND.
4.
Adjust the
plotter or oscilloscope X and Y zero controls until plotter's pen or oscilloscope's dot
is
the the graph or display center.
5.
Position the Y/POT ADDRESS and X ADDRESS switches to -REF.
6.
Adjust the plotter or oscilloscope X and Y gain controls until the pen or dot
is
the pen
or dot negative full scale deflection.
7.
Position the Y/POT ADDRESS and X ADDRESS switches to
+
REF.
8.
Check the pen or dot.
It
should be the positive
full
scale deflection.
9.
Repeat the procedures if necessary.
The
readout
instruments
will
either
plot
or
display
an
amplifier
output
as
a
function
of
time
or
of
another
amplifier
output,
as
selected
by
Y
and
X
ADDRESS
switch
positions
(para
1.5.)
Regarding
time
functions,
zero
time
begins
at
the
negative
full
scale
deflection
and
sweeps
to
positive
full
scale,
where
the
positive
full
scale
deflection
equals
the
compute
time
period
(para.
1.3.)
If
the
oscilloscope
internal
time
base
is
used
for
the
repetitive
operation
display,
the
fast
time
scale
ratio
of
400:
1
must
be
considered:
one
computer
time
second
equals
2.5
milliseconds
real
time.
1.2
SETTING
COEFFICIENT
POTENTIOMETERS
Coefficients
are
set
in
a
potentiometer
setting
mode
where
a
setting
is
displayed
by
the
digital voltmeter
and
a
selected
potentiometer
is
adjusted
until
the
desired
setting
is
observed.
Setting
procedures
are:
1.
Complete all patching
so
that settings are made under their operating loads.
(If
pots 7
and 8 are to be used
as
normal attenuators, check to assure that their bottom ends are
patched to ground.)
2.
Position the
MODE
SELECTOR switch to POT SET.
3.
Position the Y/POT ADDRESS switch to the number ofthe pot to be set.
4.
Adjust the pot knob until the desired setting
is
displayed.
1.2.1
Effects
of
Amplifier
Overrange
An
amplifier
overrange
will
alter
the
setting
of
any
pot
patched
to
the
overranged
amplifier
input.
If
the
overload
alarm
appears
when
the
POT
SET
mode
is
selected,
remove
the
overrange
condition
by
patching
overranged
amplifier
outputs
directly
to
their
summing
junctions.
Be
sure
to
remove
these
patch
cords
prior
to
running
the
program.
1.3
SETTING
THE
COMPUTE
TIME
PERIOD
The
Compute
Time
Period
is
the
time
taken
by
the
internal
time
base
to
sweep
from
minus
to
plus
reference.
It
is
the
full
scale
X
axis
co-
ordinate
of
plotted
or
displayed
time
response
curves.
It
is
adjustable
from
1
O
to
approximately
100
computer
time
seconds
by
the
COMPUTE
TIME
control.
Setting
procedures
are:
1.
Position the
MODE
SELECTOR switch to POT SET.
2.
Position the Y/POT ADDRESS switch to GND/X.
3.
Position the X ADDRESS switch to CTP.
4.
Adjust the COMPUTETIME control until the desired compute time period divided
by
100
is
displayed. (The display for a compute time period of
20
computer time seconds
will show .200)
------------------------------------COM
DYNA,
INC.

OPERATOR'S
& MAINTENANCE
MANUAL
1.4
DIGITAL
VOLTMETER
MEASUREMENTS
OF
ANALOG
VARIABLES
Static conditions
of
analog
variables
may
be
measured
as
follows:
1.4.1
Measurement
of
Amplifier
Outputs
in
the
POT
SET
Mode.
1.
Position
the
MODE
SELECTOR
to
the
POT
SET
position.
2.
Position the Y/POT ADDRESS switch to GND/X.
3.
Position the X ADDRESS switch to the number of the amplifier output to be
measured.
4.
Read the display.
1.4.2
Measurement
of
Amplfier
Outputs
in
the
QPR
Modes.
1.
Patch the Y OUTPUT rear terminal to METER INPUT.
2.
Position the
MODE
SELECTOR to the OPR position.
3.
Position the Y/POT ADDRESS switch to the number of the amplifier output to be
measured.
4.
Read the display.
1.4.3
Measurement
of
the
Sum
of
Integrator
Inputs.
1.
Patch the Y OUTPUT rear terminal to METER INPUT.
2.
Position the
MODE
SELECTOR to the OPR position.
3.
Depress the IC mode control push button.
4.
Patch the SJ jack of the integrator input to be measured to the
SJ
jack of an unused
amplifier; the unused amplifier to have a 1 resistor feedback (except should an
overrange result and then the feedback would be changed to .1.)
5.
Follow normal procedures 1.4.2 to measure the amplifier output which
is
the inverted
sum of the integrator inputs.
1.4.4
Measurement
of
External
Inputs
1.
Position the
MODE
SELECTOR to the QPR position.
2.
Connect the external input to be measured to METER INPUT rear terminal.
3. Read the display.
1.5
PROBLEM
SOLUTION
The
typical
analysis
of
an
analog
computer
simulation
is
to
evaluate
the
response
curves
of
dependent
variables
(ampliier
outputs)
as
functions
of
the
independent
variable
(time.)
To
produce
time
response
curves:
1.
Position the Y/POT ADDRESS switch to the amplifier output that
is
to be the curve's
ordinate.
2.
Position the
XI
ADDRESS switch to TIME, the curve's abscissa.
Oscilloscope
Display:
3.
Depress the RO mode control push button. (The entire response curve
is
displayed.)
XV
Recorders:
3.
Depress the IC mode control push button. (All integrators are simulataneously placed
into an initial condition mode.)
4.
Depress the OP push button. (All integrators are placed into an operate or run state
and a plot of the response curve
is
drawn.)
page
3.
---------------------------------------COM
DYNA,
INC.

OPERATOR'S
& MAINTENANCE
MANUAL
page
4.
Evaluation
of
Time
Response
Curves
Based
on
Physical
Units
Y
Axis
...
Where
zero
is
the
center
co-ordinate,
the
full
scale
co-
ordinates
are
equated
to physical
units
by
setting
them
equal
to
the
amplifier output's amplitude
scale
factor:
the
maximum
estimated
amplitude
assigned
to
derive
a program's
scaled
equations
so
that
an
output
in
physical
units
equals
the
voltage output
times
the
scale
factor.
X
Axis
...
The
full
scale
X
axis
co-ordinate
is
the
compute time
period
in
computer
time units divided
by
the
program's
time
scale
factor.
Changing
the
Compute
Time
Period
If
it
is
determined that
the
compute
time
period
is
either
too
long
or short for
convenient display
or
recording,
the
COMPUTE
TIME
control
may
be
adjusted
and
a
new
compute
time
period
established.
A
new
compute
time
period
does
not
affect
the
response.
only
the
time
period
of
the
response.
If
a
convenient
readout
is
not
obtainable with
the
range
of
compute
time
period
selections,
a
new
program time
scale
factor
must
be
selected.
To
produce
dependent
variables
vs.
dependent
variable
curves:
Producing
curves
where
an
amplifier output
replaces
time
as
the
abcissa
requires
only that the X
ADDRESS
switch
be
positioned
to
the
desired
amplifier
number.
In
such
cases,
zero
shall
be
the
center
co-ordinate;
the
oscilloscope
or
plotter
plus
and
minus
full
scale
co-ordinates,
like
the
Y
axis
scaling,
shall
be
set
equal
to
the
amplifier
output's amplitude
scale
factor.
1.6 SLAVING TWO
OR
UNITS
TOGETHER
When
problem requirements
exceed
the
capacity
of
one
GP-6,
two or
more
units
may
be
slaved
into a single operating
system.
1. Designate a unit to be the master; others shall then be slaves
to
the master.
2. Connect a common
ground
between units: rear terminals
GND
suggested.
3.
On
all slave units remove the shorting wire between
rear
terminals
OP
OUTPUT
and
OP
INPUT.
4.
Connect
the
rear
terminal
OP
OUTPUT
of
the master to the
OP
INPUT
terminals
of
all slave units.
5.
Patch each
unit
and the interconnections
between units.
6.
Run
the program from the master.
Note:
.After
the slaved operation
has
been
completed,
in
con-sideration
of
the next
user,
replace the
OP
OUTPUT
to
OP
INPUT
shorting wire.
1.7
OVERRANGE
When
any
of
the
eight operational amplifiers
exceed
either
plus
or
minus
reference,
the
OVLD
light
will
turn
on.
(The
actual
overrange threshold
is
normally
set
to about
1.05.
See
the
970
Overload
lndiator circuit description for adjustment
procedures.)
1.8
POWER
The
AC
power switch
is
a
part
of
the
COMPUTE
TIME
control.
To
turn
power
on,
rotate
the
COMPUTE
TIME
control clockwise
from
the
OFF
position.
The
above
located pilot light
indicates a power
on
condition.
.__-------------------------------------COM
DYNA,
INC.

OPERA
TOR'S
& MAINTENANCE
MANUAL
----------------------------p-ag-e--,S.
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pin
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pin
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9----------'
Figure
2-1
is
aschematic
of
operator functions. Descriptions
of
the
individual operations
are
described
in
the following:
2.1
Y/POT
ADDRESS
The
Y/POT
ADDRESS
switch
is
an
11
position, 2pole rotary switch.
One
section selects
amplifier outputs for
external
readout;
the othersection selects coefficient potentiometer
outputs for setting attenuator constants.
The
amplifier selector wiper
is
connected
to
the
rear
terminal Y
OUTPUT;
the
pot selector wiper
is
brought to a
MODE
SELECTOR
switch contact to
be
the
input to
the
internal
digital voltmeter
(DVM)
when
the
switch
is
in
the
POT
SET
position.
(It
is
noted
that
the
GND/X
position
of
the pot selector section
is
con-nected to
the
X
ADDRESS
switch wiper
so
that the
DVM
may
be
used
to
measure
X
ADDRESS
selections while
in
the
pot
set
mode.)
u
(/)0
--------------------------------------COM
DYNA,
INC.

OPERA TOR'S & MAINTENANCE MANUAL
page 6.
2.2 X ADDRESS
The X ADDRESS switch is an 11 position, 1 pole rotary switch. It selects amplifier outputs,
the internal time base (TIME) and the compute time output (CTP.) Its wiper is connected
to the rear terminal X OUTPUT and the GND/X position of the Y/POT ADDRESS switch,
pot selector section.
2.3 MODE CONTROL
The following system integrator modes are controlled with the four mode control push
buttons.
2.3.1 Initial Condition
Depression of the IC push button pulls the OP bus to ground for reset of system
integrators.
2.3.2 Hold
Depression of the HD push buttons pulls the OP bus to a hold mode control voltage
level (approximately -2 volts) for placement of system integrators into a hold mode
condition.
2.3.3 Operate
Depression of the OP push button releases the OP bus to an operate mode control
level (-5 to -15 volts) for placement of system integrators into a slow time, operate
condition.
2.3.4 Repetitive Operation
Depression of the RO push button de-energizes the integrator time scale relays and
connects the OP bus to the repetitive operation timing unit mode control. Integrator
time constants are reduced by a factor of 400 and mode control is repetitively
switched from initial condition to operate.
2.4 MODE SELECTOR
The MODE SELECTOR switch is a 2 position, 12 pole rotary switch. It selects the
following functions to distinguish between the computer's POT SET and OPR modes.
2.4.1 Setting of Coefficient Potentiometers
The top end input to each coefficient potentiometer is connected to one of eight
poles. In the OPR position, the poles are switched to the patch panel input; in POT
SET, the poles are switch to +1O volts. Thus in the pot set mode the inputs to all
potentiometers are replaced by computer reference and the potentiometer output
values are measurements of the settings.
2.4.2 Internal Digital Voltmeter
One pole is connected to the DVM input. In POT SET, the pole is switched to the
Y/POT ADDRESS switch wiper, pot selector section; in OPR the pole is switched to
the rear terminal METER INPUT.
2.4.3 Integrator Mode Control
One pole is connected to the rear terminal OP OUTPUT. In POT SET, the pole is
switched to ground; in OPR the pole is switched to the push button mode control
switch selection. Thus in the pot set mode, all integrators are placed into an initial
condition state; in the operate mode, all integrators are controlled by the push button
selections.
2.4.4 Compute Time Period Amplifier
Two poles are used to program the CTP amplifier, shown in Figures 2-1 and 2-2. The
CTP amplfier is a part of the Timer PC board assembly.
-----------------------------------COM DYNA, INC.

OPERATOR'S
&
MAINTENANCE
MANUAL
+10
--€1:
~~
(> I
CTP
Figure
2-1
Mode
SelKt.or -
-'
:
......
Hold
Inhibit
In
OPR,
+
10
volts
is
applied
through
the
COMPUTE
TIME
control
(100K
ohms)
and
a
series
1
OK
ohm
resistor
to
the
CTP
amplifier
summing
junction. A1
OK
ohm
resistor
is
the
feedback.
Therefore:
CTP
=
-10/(CT
+
10)
x
10
volts.
In
POT
SET,
+
10
volts
is
applied
through
a
100K
ohm
resistor
to
the
CTP
summing
junction.
The
COMPUTE
TIME
control
and
1
OK
ohm
resistor
are
the
feedback.
Therefore:
CTP
=
-(CT
+
10)/100
x
10
volts.
The
CTP
amplifier
output
in
POT
SET
is
one
tenth
the
reciprocal
of
its
value
in
OPR.
As
the
CTP
output
is
the
input
to
the
time
base
integrator,
its
reciprocal
is
an
indicator
of
the
compute
time
period.
2.4.5
Hold Inhibit
One
pole
is
connected
to
the
integrator
hold
inhibit
control.
In
the
normal
integrator
initial
condition
mode,
the
hold
switch
is
shut
off,
thereby
isolating
the
input
resistor
network.
As
poten-itometers
must
be
set
with
their
resistor
loads,
it
is
necessary
to
disable
the
hold
switches
during
the
pot
set
mode.
In
POT
SET,
the
pole
is
switched
to a
positive
voltage
and
all
integrator
hold
switches
are
held
in
an
"on"
condition;
in
OPR
the
pole
is
switched
negative
and
all
integrator
all
allowed
to function
under
normal
hold
mode
control.
2.5
COMPUTE
TIME
The
COMPUTE
TIME
control
is
a
combination
1
OOK
ohm
variable
resistor
and
off-on
switch.
While
in
the
operate
mode
the
variable
resistor
is
the
CTP
amplifier
input.
The
CTP
amplifier
is
scaled
so
that
the
COMPUTE
TIME
control
adjusts
its
output
within
a
range
of
-10
volts
to
-1
volt.
The
time
base
integrator
is
scaled
so
that a
-1
O
volt
input
produces
a
compute
time
period
of
1
o
computer
seconds;
a
-1
volt input
produces
100
seconds.
The
off-on
switch
is
the
primary
AC
power
switch.
2.6
COEFFICIENT
POTENTIOMETERS
The
coefficient
potentiometers
are
ten
turn,
5K
ohm
variable
resistors.
Pots
1 -
6
are
arranged
as
attenuators
with
their
bottom
ends
grounded;
pots
7&8
have
their
bottom
ends
terminated
at
the
patch
panel.
2.7
OVERLOAD
INDICATORS
The
OVLD
lamp
is
alight
alarm
that
indicates
when
one
or
more
of
the
eight
patch
panel
amplifier
outputs
exceed
either
a
positive
or
negative
1
o
volts
reference.
2.8
DIGITAL
VOLTMETER
The
DVM
includes
the
features
of
31
/2
digits
display,
1
o
volts
full
scale
and
autopolarity.
Its
decimal
is
positioned
so
that
1
o
volts
appears
as
unity
(1.000:
a
conformance
to
normallized
or
dimensionaless
amplitude
scaling.
page
7.
-----------------------------------COM
DYNA,
INC.

OPERATOR'S
&
MAINTENANCE
MANUAL
page
a.
2.9
REAR
TERMINALS
The
following
is
a
wiring
list for
the
rear
binding
post
terminals
Terminal
0
1
OP
OUTPUT
OP
INPUT
Color
Red
Green
Red
Green
X
OUTPUT
Red
GND
Black
Y
OUTPUT
Red
METER
INPUT
Green
2.10
INTERFACE
CONNECTOR
Description
-15
volts.
+
15
volts.
Integrator
mode
control
output.
Integrator
mode
control
input,
connected
to
the
patch
panel
OP
jacks
and
the
time
base
integra-
tor
control.
For
normal
operation
a
jumper
wire
connects
OP
OUTPUT
to
OP
INPUT.
Output
of
the
X
ADDRESS
switch.
Signal
Ground.
Output
of
the
Y/POT
ADDRESS
switch
amplifier
selector
section.
Input
to
the
DVM
when
the the
MODE
SELECTOR
switch
is
in
the
OPR
position.
The
interface
connector
is
located
below
the
rear
terminals.
From
looking
inside
the
chassis,
the
pin
terminations
are
as
follows:
1.
-15V
14.
nc
2.
+15V
15.
nc
3. +10V
16.
nc.
4.
-10V
17.
nc
5.
Analog
Ground
18.
Amplifier
#1.
6.
nc.
19.
Amplifier
#2.
7.
OP
Bus
Output
20.
Amplfier
#3.
8.
OP
Bus
Input
21.
Amplifier
#4.
9.
Time
Scale
Relay
Bus
22.
Amplifier
#5.
10.
nc.
23.
Amplifier
#6.
11.
nc.
24.
Amplifier
#7.
12.
Digital
Ground
25.
Amplifier
#8
13.
Vee
(
+5V)
----------------------------------COM
DYNA,
INC.
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