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NATIONAL RADIO ASTRONOMY OBSERVATORYGreen Bank, West Virginia
Electronics Division Internal Report No. 111
300-FOOT TELESCOPE TRAVELING FEEDAND STERLING MOUNT CONTROL SYSTEM
William D. Brundage
NOVEMBER 1971
NUMBER OF COPIES: 150
300-FOOT TELESCOPE TRAVELING FEEDAND STERLING MOUNT CONTROL SYSTEM
William D. Brundage
TABLE OF CONTENTS
Page
1. 0 Introduction 4) 000 0 0 0 0 0 p eop0000 OOOOOOOOOOOO .. OOOOOOOOOOOOOOOOOOO 12. 0 SysteinSpegi ons . . . . . . . . . . . ......... — • . • • . ......... . ...... 13. 0 General Descri ti_p_DnadL..,_yeS stem. 54. 0 Position Readout . . . . . . . „ „ ,, ..... .......... . • . • • • 0 • • • • • • 0 • 0 . 5
4. 1 Readout Circuits ....a.... 00000 00000 00 ..... 0 .... 000 54. 2 Readout Potentiometers ... ea ... . , • . • • • • • • • • . ....... • • • • • • 64. 3 Position Readout Box . . .................................................................. 74.4 Voltage Source Card ..............................................................................74. 5 Voltage Follower Card .............................................................. , ..........74.6 Relay Card ....................................................................................... ........84. 7 Calibration Insertion and Adjustment Circuits ................ . . — .........84.8 Position Displays ........................................................................... ........84. 9 Position Readout by Computer ..............................................................94. 10 Calibration Procedure . 00000 9
5, 0 Console Control Panels ..................................................................................... 95. 1 Hour Angle Control Panel .................................... . ...................... 105.2 Rotation Control Panel .... 0000 000000000000 105. 3........Focus Control Panel ........................................................................... 10
6. 0 Position Interlocks ................................. .....................................................106. 1 Functions of Interlocks .............................................. . .................. 116. 2 Interlock Circuit ............................................................................. ......11
7.0 Translators ........................................................................................... 127. 1 Pulse Receiver ............................................................................. ........127.2 Local Control ............................................................................. ..........127. 3 Traveling Feed Hour Angle Translator ............. 000 000 . 127, 4 Sterling Mount Hour Angle Translator ........................................ 137. 5 Sterling Mount Rotation Translator ............ ... ... .... . 137. 6 Sterling Mount Focus Translator .................................................. 13
80 0 Drive Motors ................................................................................................. 148. 1 Traveling Feed Hour Angle Motor .................................. . ............ 148. 2 Sterling Mount Hour Angle Motor ................................................ 148.3 Sterling Mount Rotation and Focus Motors .................................. 14
LIST OF FIGURES
Page
Simplified Block Diagram of Total 300-ft Telescope PointingControlSystem • • • • • ............. . ........................ 15
2. Position Readout Circuit: Typical Block Diagram ................................. 16
3. Position Readout Circuit: Traveling Feed Hour Angle a.. ........ 17
4. Position Readout Circuit: Sterling Mount Hour Angle . - • .......... • 18
5. Hour Angle Readout: Calibration Insertion and Switching Circuits 19
6. Hour Angle Readout: Adjustment Circuits ....... • ..... • . • .......... 20
7. Position Readout Circuit: Sterling Mount Rotation .. . 21.••••••••••••••.
8. Position Readout Circuit: Sterling Mount Focus .... ........... ...... 22
9. Rotation and Focus Readout: Calibration. Insertion andAdjustment Circuits .................... .. ...... ...••• -••• • 23
10. Digital Panel Meters: Connections and Specifications . ......... .. ... 24
11. Readout Analog Buffer Card . ..... .....• -•••••••••••••••••••••• 0 25
12. Readout Voltage Source Card C-1 .................................. 26
13. Readout Voltage Follower Card C-2 • • • • . ..... -0..00 - • • a - • • • • 27
14. Readout Relay Card C-3 ......................................... 28
15. Position Readout: Nine Volt Standard Circuit and Specifications.. . • 29• •
16. Position Readout Box: Front and Rear Views .. • .. • • ........ . • . ..... 30
17. Position Readout Box: Card Locations and Functions ... • • • • • • • • • • • • • 31
18. Console Control Panel 0. • • • • .00.. • • • ... . • . • ........ • .. • • • • • . 32
19. Hour Angle Control Panel: Schematic ......... • ..... ..... • O 0 0 0 • 33
20. Sterling Mount Rotation Control Panel: Schematic • . • ..... • 34
21. Sterling Mount Focus Control Panel: Schematic ..... • • •
•
35
25. Interlock Circuit: Sterling Mount Hour Angle
26. Interlock Circuit: Sterling Mount Rotation
00 — 0 0000000
0000000000000 0
O•
0 0
000•00
0000•O
00
p 0
39
40
LIST OF FIGURES (CONTINUED):
Page
22. Interlock and Translator Rack .0 O000 0000000000000 00000 000000000000 38
23. Interlock: Interconnection Block Diagram 00-0 -000— • • • • • • 37
24. Interlock Circuit: Traveling Feed 00 O 000000000•000 0•0000000•00000 00 38
27. Interlock Circuit: Sterling Mount Focus 0000000000 00000000 ......... 41
28. Translators in Telescope Focal Cabin . 000000 000 .......... 00 42
29. Translators: Pulse Receiver Circuits 00000000000 000 0 00 0 0900000090 43
30. Translators: Local Control Circuits O00 0000 00000 000
0000 0000000000 44
31. Translators: Focus Brake Release Circuit .00000000000000 O0000 0 0000 45
32. Motors: Traveling Feed and Sterling Mount Hour Angle Wiring 0000000 46
33. Motors: Sterling Mount Rotation and Focus Wiring •0 —•0000....... 47
34. Photos of Traveling Feed: Fifty-foot Track seen from Below(bottom); Carriage with 110-240 MHz Feed (top) —0000 00000000 48
35. Photos of Sterling Mount: Full View from West Side (bottom);Full View from South Side (top) 000000 pp ppop0 0 00 0 000 ...... 00 00 0 49
36. Photos of Sterling Mount: Hour Angle Motor and Drive (bottom);Hour Angle Zero Switch (top) 04, 0 ,, ,,po popopop 000 000 00 000000000 50
37. Photos of Sterling Mount: Rotation Zero Switch, Drive Spline andRing-Gear (bottom); Rotation Limit Switches and a FocusDrive -
Screw (top) 0000.00 0 0 000 0000000000000000 0000000000• 00 51
38. Photos of Sterling Mount: Rotation Motor and Position ReadoutPot (bottom); Focus Motor and Brake (top) 000000.00000 -00— 52
300-FOOT TELESCOPE TRAVELING FEEDAND STERLING MOUNT CONTROL SYSTEM
William D. Brundage
L 0 INTRODUCTION
Because the 300-foot telescope is a transit instrument, integration times on
discrete sources has been limited to the transit time between the half power points of
the antenna beam. This time can be short indeed; less than 40 seconds when observing
near the equator at frequencies above 1400 MHz. However, limited source tracking
can be accomplished (when varying efficiency, beam shape and coma lobe are tolerable)
by moving the feed off the focal axis of the telescope. Moving the feed west of axis
moves the beam east on the sky.
In 1969 a traveling feed with 50 foot long track for use below 1000 MHz was in-
stalled on the 300-foot. See Figure 34. In April, 1971, a Sterling mount was installed.
This mount offsets ± 15 inches, rotates and focuses a standard front-end box. See
Figure 35.
The controls for the traveling feed, Sterling mount and telescope declination
pointing are integrated into one system. Each movement can be either computer con-
trolled or manually controlled.
This report covers the traveling feed and Sterling mount section of the control
system. This includes the position readout box, position displays, position readout
potentiometers, position input to the computer, console control panels, position inter-
locks and motor drivers. Only that portion of the digital control interface box which
is related to position readout is included.
The digital control system is described separately in detail in Electronics Divi-
sion Internal Report No. 110, "300-Foot Telescope Drive System and DDP-116 Com-
puter Interface".
An operational description of the traveling feed and Sterling mount control
system including a readout calibration procedure is given in Telescope Operations
Division Report No. 7, "Operations Manual for the Traveling Feed and Sterling Mount
on the 300-Foot Telescope".
Information on the use of the computer control programs is in Computer Divi-
sion Internal Report No. 9, "300-Foot Telescope Positioning Routines".
2. 0 SPECIFICATIONS
Specifications for the traveling feed and Sterling mount are given in tabular
form on the following pages.
SPE
CIF
ICA
TIO
NS
FOR
TR
AV
EL
ING
FE
ED
AN
D S
TE
RL
ING
MO
UN
T
Ster
ling
Mou
ntSt
erlin
g M
ount
Ster
ling
Mou
ntH
our
Ang
leR
otat
ion
Focu
sFu
nctio
nT
rave
ling
Fee
dH
our
Ang
le
400
degr
eeT
otal
Tra
vel
50 in
ch=
1270
mm
30 in
ch58
. 5 a
rc m
in55
9 in
ch18
. 2 d
egre
e
±20
0 de
gree
±25
inch
±63
5 m
m±
280
inch
±9.
1 d
egre
e±
15. 0
inch
±29
.2 a
rc m
in
±0.
5 in
ch±
1. 0
arc
min
±0.
58
degr
ee±
0. 0
86 in
ch±
10 a
rc m
in±
0. 0
6 in
ch±
1. 5
mm
±O
. 25
inch
±0.
5 a
rc m
in±
O. 0
3 in
ch±
0.76
mm
±0.
3 de
gree
±0.
05
inch
±6
arc
sec
Fee
d ce
nter
edon
foc
al a
xis.
+ is
wes
t on
sky
+ is
fro
m n
orth
to
(box
eas
t of
cent
er)
east
on
sky.
Cen
ter
with
dow
elN
omin
al c
ente
rpi
n N
-S.
+ is
up
away
from
dis
h.+
is w
est o
n sk
y(f
eed
east
of
cent
erR
eado
ut S
ign
and
Pol
arit
y
± 9
.9 v
olt
± 9.
9 v
olt
± 9.
8 v
olt
±8.
5 v
olt
Rea
dout
Vol
tage
Ran
ge
1. 5
152
Inch
/vol
t20
. 202
deg
ree/
volt
64. 6
46 m
m/v
olt
33. 0
0 in
ch/v
olt
Rea
dout
Vol
tage
Scal
e
Func
tion
Tra
veli
ng F
eed
Hou
r A
ngle
Ster
ling
Mou
ntH
our
Ang
leSt
erlin
g M
ount
Rot
atio
n....
Ster
ling
Mou
ntFo
cus
Ana
log
Buf
fer
Cha
nnel
No.
. . .
• . 0
01
23
AID
Bin
ary
Rea
dout
:W
ith
+9
V T
est
......
......
......
......
..0
111
001
100
110
01
Wit
h -9
V T
est
.... ..... .
......
..1
000
no o
n o
n i
o>
Pos
itio
n D
ispl
ay o
n C
onso
leD
igit
al P
anel
Met
er (
DP
M):
Whe
n C
ompu
ter
Con
trol
led:
DP
M R
ange
, Dig
its
and
Uni
ts..
± 28
0. 0
inch
± 15
. 00
inch
1 20
0. 0
deg
ree
1 64
0. 0
mm
DP
M M
axim
um E
rror
. ......
± 00
0. 3
inch
± 00
. 03
inch
± 0
00.3
deg
ree
± 0
00.3
mm
Vol
tage
Div
ider
Rat
io (
out/
in)
.x
0.33
00x
0. 1
5152
x O
. 202
02x
O. 6
4646
DP
M R
eadi
ng w
ith
9 V
Tes
t ...
2. 9
70 V
= 2
97. 0
inch
L 3
64 V
= 1
3. 6
4 in
chL
818
V =
181
. 8 d
eg5.
818
V =
58L
8 m
m
Whe
n M
anua
lly C
ontr
olle
d:
DP
M R
ange
, Dig
its
and
Uni
ts..
± 72
0. O
m a
t 6
= 8
7°±
37. 0
0m a
t 6
= 8
7°1
200.
0 d
egre
e±
640.
0 m
m±
036.
Om
at
6 =
ØO±
02. 0
0m a
t 6
= 0
°
DP
M M
axim
um E
rror
....
......
.*
000.
3m
± 00
. 03
m±
000
.3 d
egre
e±
000
.3 m
m
Vol
tage
Div
ider
Rat
io (
out/
in)
.x
0. 8
50at
6 =
87°
x 0.
0424
at
6= 0
°x
O. 3
74at
6 =
87°
x 0.
0202
at 6
= 0
°x
0. 2
0202
x 0.
646
46
Fun
ctio
nT
ravel
ing F
eed
Hou
r A
ngle
Ste
rlin
g M
ount
Hou
r A
ngle
Ste
rlin
g M
ount
Rot
atio
nS
terl
ing
Mou
ntF
ocus
Ste
ppin
g M
otor
Typ
eH
S5O
LH
S400
BH
5150
0H
S150
0
Mot
or D
rive
r T
ype
(Tra
nsl
ato
r)
Lea
d S
crew
Mo
tor:
Scr
ew R
atio
Mov
emen
t/M
otor
Dri
veP
uls
e
Max
. Dri
ve R
ate
(Sle
w)
Max
. Tra
ckin
g R
ate
ST18
00B
V
(Cha
in)
..........
_
O. 0
0475
inch
/pul
se
2. 0
0 in
ch/s
ec
= 4
00 p
ulse
/sec
0.2
5 i
nch
/sec
= 5
0 pu
lse/
sec
HT
R15
00
0. 2
0 in
ch/r
ev
1. 5
:1
O. 0
169
mm
ipul
se
6. 7
6 m
m/s
ec
= 4
00 p
ulse
/sec
......._.
....
..........
.....
Slo
w M
anua
l Rat
e
Com
pute
r C
ontr
olle
d R
ate
Incr
emen
t
O. 1
2 in
ch/s
ec
= 1
/16 s
lew
rat
e
O. 0
156
inch
/sec
= 3.12 pulse/sec
0. 0
039
inch
/sec
= 1
.56
puls
e/s
ec
O. 1
04 in
ch/s
ec
6.2
5 p
uls
e/se
c
O. 4
2 m
m/s
ec
= 1
/16
slew
rat
e
O. 5
3 m
mis
ec
3. 1
2 pu
lse/
sec
5
3. 0 GENERAL DESCRIPTION OF THE SYSTEM
This report covers the traveling feed and Sterling mount section of the control
system except for the digital control interface box.
A simplified block diagram of the total 300-ft telescope pointing control system
is given in Figure L The diagram is self-explanatory.
The heart of the system is the Digital Control Interface Box which contains
digital circuitry to generate rate signals for all movements of the Sterling mount and
traveling feed and also the telescope declination. See EDIR 110. Rate control informa-
tion from either the computer or the manual console controls is selected for each motion
by push buttons on the console control panels. The rate signals to the traveling feed and
Sterling mount drives consist of separate pulse trains for each direction. Each pulse
causes a drive motor to move one step (1/200 revolution). The drive pulses are inter-
rupted by position interlocks which act as limit switches and safety protectors.
Position information is an analog voltage proportional to position from precision
10-turn potentiometers. The voltage scale is fixed for each movement and is read
directly by the computer via its analog multiplexer and analog-to-digital converter.
Position display on the console is by digital panel meters (voltmeters). The position
voltage is fed to each meter through a voltage divider so that the meter reads in
the appropriate units.
4. 0 POSITION READOUT
4. 1 Readout Circuits
A block diagram of a typical position readout circuit is given in Figure 2.
Each position readout is by a DC voltage proportional to position. This voltage
is derived from a 10-turn precision potentiometer.
Each movement has a fixed voltage scale (inches/volt, etc.) which is set by the
voltage source. Circuit common comes from a variable voltage divider across the volt-
age source which allows the readout voltage zero to be set to the position zero.
A voltage follower with high input and low output impedances eliminates significant
loading errors in the potentiometer circuit. The follower output is defined as the posi-
tion voltage. Mechanical zero and negative limit switches on the traveling feed and
Sterling mount define "position". An internal 9. 000 volt standard defines "voltage".
6
Each voltage follower feeds directly to the computer analog buffer, multiplexer
and A/D converter. Voltage dividers on the inputs to each of the position display panel
meters makes them read directly in the appropriate units of inches, minutes of time,
degrees or millimeters. These dividers have a small adjustment range.
The TRAVELING FEED and STERLING MOUNT HOUR ANGLE position read-
out circuits are given in Figures 3 and 4, respectively. The hour angle panel meter
involves switching circuitry shown in Figure 5. The console TRAIT. FEED/STER. MOUNT
push-button connects the hour angle meter to either the traveling feed or Sterling mount
hour angle position voltage and also connects the required voltage divider. The console
COMPUTER/MANUAL push-button substitutes a 4-digit variable voltage divider for the
fixed dividers when in manual control. The telescope operator can set the variable divider
so the panel meter reads directly in minutes of hour angle. The divider setting depends
on declination and whether the traveling feed or Sterling mount is in use. Adjustment
circuits for hour angle readout are shown in Figure 6.
The STERLING MOUNT ROTATION and FOCUS READOUT circuits are shown
in Figures 7 and 8, respectively. Calibration insertion and adjustment circuits are
given in Figure 9.
4.2 Readout Potentiometers
A precision 10-turn potentiometer provides the voltage proportional to position.
Each pot is coupled to the positioning shaft, screw or ring-gear through anti-backlash
gearing. The gearing is such that each pot shaft rotates approximately 9 turns for full
travel of the traveling feed or Sterling mount.
The traveling feed hour angle pot is a Borg Micropot model 205 with bushing
mount, 1 K ohm resistance, and independent linearity error of ± 0.05 percent.
The Sterling mount pots are Beckman Helipot Part No. 7603-1851 with servo
mounting, 20 K ohm resistance and ± 0.015 percent independent linearity error.
Figures 36 and 38 include views of the hour angle and rotation pot mountings, respectively.
7
4. 3 Position Readout Box
Most of the position readout circuits are located inside the position readout box,
or chassis. Many of these circuits are on plug-in cards to facilitate servicing and to
minimize down-time due to component failure. Figure 16 shows front and rear views
of the box.
Test push-buttons and calibrating adjustments are located on the left side of the
front panel. The main part of the front panel opens on hinges for access to the plug-in
circuit cards in slots S1 through S8. Figure 17 lists card locations and functions.
The rear panel contains connectors and test push-buttons for the digital panel
meters. The 15-shielded-pair telescope cable J34 is mounted on the side. A fan pulls
air through the card stack to maintain a fairly stable temperature.
4. 4 Voltage Source Card
This card contains the circuits for two voltage sources, consisting of two preci-
sion adjustable voltage regulators. Each regulator has its own external 30 volt supply
which is an Analog Devices model AD902. The Motorola MC 1496R integrated circuit has
low drift of 0. 002 percent/°C typical. Current limiting at 80 mA is provided by an ex-
ternal transistor. Each pair of power resistors in the variable "center tap" are mounted
on a common heat sink in order to insure equal temperatures and low drift.
Figure 12 shows a schematic diagram of the voltage source card and some
associated circuits.
4. 5 Voltage Follower Card
Four voltage followers are included on one card. There is one ± 15 V DC supply
for the card. Therefore, all four position readout circuits have their common tied
together only at the voltage follower card. Each follower consists of an Analog Devices
118A operational amplifier with a feedback resistor of 5. 1 K to minimize error due to
input bias current with the maximum 5 K source resistance of the Sterling mount read-
out pots. A trip pot provides adjustment for zero offset.
Measured input resistance of each follower is greater than 100 megobm. Mea-
sured output error is less than 0.4 millivolt over the input range of 4 . to - 10 volts.
The schematic diagram of the card and some associated circuits are given in
Figure 13.
8
4. 6 Relay Card
Relays are used to increase the number of effective poles on the STERLING
MOUNT/TRAVELING FEED and COMPUTER/MANUAL select switches on the hour
angle control console. This also allows the position readout wiring to avoid the console
switches and possible noise pickup.
Three Potter and Brumfield relays, part no. R40-E1-L4-V800, are mounted on
each card. The relay has 4PDT contacts designed for "dry circuit" (very low current)
use and a 24 V DC coil.
The relay card circuit is shown in Figure 14.
4. 7 Calibration Insertion and Adjustment Circuits
Circuits for internal calibration of the readout system provide means of sub-
stituting zero volt and a 9. 0 volt standard on the position voltage lines. Also there are
means for adjusting voltage dividers so that the readout displays can be set to the exact
voltage scale defined for each position readout.
Figure 5 shows the calibration insertion and switching circuits for hour angle.
Figure 6 shows the adjustment circuits for hour angle.
Figure 9 shows the calibration insertion and adjustment circuits for rotation
and focus.
The nine volt standard circuit and specifications are shown in Figure 15.
4.8 Position Displays
Position for hour angle, rotation and focus is provided on the control console by
three digital panel meters. Each meter has push-buttons which provides test voltages
to absolutely calibrate the meter' s zero, positive scale and negative scale. Adjustments
are available on the front panel of the meter. The test buttons are located on the rear
of the position readout box below the DPM connectors and are visible in Figure 16. The
hour angle decimal point is shifted by the STERLING MOUNT/TRAVELING FEED select
switch and a relay. Circuits are shown in Figure 10.
9
4. 9 Position Readout by Coinputer
The computer obtains position information by reading the position voltages 10
times per second. Programming converts the voltage readings to positions by apply-
ing the appropriate scale factors.
Maximum error of the multiplexer/analog-to-digital converter is about 2 mV.
Therefore, the analog buffers which precede the multiplexer inputs must be very
linear and have near zero offset and a gain of exactly one. The analog buffer cards
used in the position readout channels (0-3) are slightly modified standard buffer cards.
A gain control is mounted on the card. The zero trim control is mounted above the
card socket. The circuit provides two-pole butterworth response with low-pass cutoff
frequency of 10 Hz. A differential input minimizes noise pickup on the input cable.
Figure 11 shows the circuit of the buffer card.
4. 10 Calibration Procedure
The procedure for calibration of the entire position readout system is contained
in Telescope Operations Division Report No. 7, "Operations Manual for the Traveling
Feed and Sterling Mount on the 300-Foot Telescope."
Basically, mechanical limit switches define actual zero positions and travel
limit positions. These positions were physically measured at the time of installation.
Each readout is adjusted to read these zero and negative limit positions after each digital
panel meter has been adjusted for proper reading with zero and -9. 0 volts on the posi-
tion voltage line. Then the zero and voltage of the sources are adjusted for proper
position voltages as read by the panel meters when the feed/mount is at zero position
and at negative limit position, respectively. The analog buffers in the computer input
are adjusted for proper digital readings on the AID converter with zero and -9. 0 V on
the position voltage lines.
5.0 CONSOLE CONTROL PANELS
Two panels on the operating console provide the telescope operator with com-
plete control of the traveling feed and Sterling mount.
- 10 -
5.1 Hour Angle Control Panel
The lower panel appearing in Figure 18 contains the hour angle controls. The
bottom row contains push-buttons for hour angle motion. The center row contains
push-buttons for power, computer or manual control, and selection of traveling feed
or Sterling mount. The thumb-wheel switch on the left, labeled SCALE, sets the hour
angle display for readout in minutes of time when in manual control. The right-hand
thumb-wheel switch, labeled RATE, sets the hour angle track-rate when in manual con-
trol. Indicator lights occupy the top row.
Figure 19 shows the wiring for the hour angle control panel. SCALE wiring is
shown in Figure 6.
5.2 Rotation Control Panel
Sterling mount rotation controls are located on the lower half of the upper
panel (Figure 18). Control push-buttons occupy the lower row and indicator lights are
in the upper row. The circuit is shown in Figure 20.
5.3 Focus Control Panel
Focus controls are located on the upper half of the upper panel (Figure 18).
Control push-buttons occupy the lower row and indicator lights are in the upper row.
The circuit is shown in Figure 21.
6.0 POSITION INTERLOCKS
An INTERLOCK box located in the focal cabin of the 300-ft telescope serves
two purposes. First, it is a control cable distribution center linking the two telescope
cables from the control building to the feed and mount limit switches, position potentiom-
eters and motor translators. Second, it contains the circuitry performing all feed and
mount position interlock functions.
The interlock box is visible at the bottom of the rear view in Figure 22.
Figure 23 is the block diagram of the interconnections between the interlock box
and translators, motors, limit switches and position potentiometers.
6.1 Functions of Interlocks
Traveling Feed (TF) Power On:
Besides applying AC power to the translator, it disengages a stow pin
which normally locks the traveling feed carriage in stow position
(-120 inches).
All Limit Switches:
They stop movement before reaching the mechanical stops by opening the
translator trigger line for that direction. They also activate console
limit lights.
Traveling Feed East 1 and West 1 Limit Switches:
These are pass-thru switches at ± 100 inches which activate when the TF
carriage is outside the middle position range. They activate console limit
lights. East 1 limit removes the Sterling mount focus power when the TF
carriage is inside this limit. It prevents driving the front-end box in the
Sterling mount down onto the TF carriage.
Sterling Mount (SM) Up-Limit Switch:
This switch is movable to allow different front-end boxes to reach maxi-
mum up level without pushing cables into the ceiling and to assure clear-
ance for the TF carriage. If the SM is below the up-limit, it removes TF
power so the TF cannot be driven into the SM front-end box.
Sterling Mount Restrictive Focus Drive (RFD) Switch:
This is a pass-thru switch which activates the console RFD light. It re-
moves SM rotation and SM HA power when focus is above this position to
prevent cable abrasion against the ceiling.
All Zero Switches:
They activate console zero lights when position is at zero ± small tolerance.
Rotation Zero Switch:
It removes up-focus drive when focus is above the RFD switch except when
the SM is at zero rotation. It prevents cable twist problems at high focus
positions.
6.2 Interlock Circuits
See Figures 24-27. All relays are failsafe in that movement stops if any relay
fails to pull in (energize).
- 12 -
7.0 TRANSLATORS
Each motor has its individual translator (driver) located in the telescope focal
cabin. See Figure 28. A translator contains DC power supplies and solid-state logic
and switching circuits necessary for developing current pulses in proper rate and
phase sequence to drive a stepping motor.
A negative volt e step at either forward or reverse external trigger terminal
causes the motor to make one step (1/200 revolution) in that direction. The control
system generates the necessary trigger pulses. The SM trigger pulses include rate
acceleration and deceleration.
Alternatively, contact closures activate an internal pulse generator of adjust-
able rate for trigger. This is used with push-buttons on each translator to provide
locally-controlled drive for servicing the traveling feed and Sterling mount. See Fig-
ure 28. All limits are bypassed when using these local controls.
7.1 Pulse Receiver
A pulse receiver on each translator converts the slow-rise drive pulse from
the digital interface into the fast negative voltage step required to trigger the transla-
tor. The receiver uses an integr ted circuit, Schmitt trigger type TAA 560. Shunt
capacitance of the telescope cable slows the rise-time of the received pulse.
A schematic of the pulse receiver and connector wiring is shown in Figure 29.
7.2 Local Control
Push-buttons on each translator provide locally-controlled drive for servicing
the traveling feed and Sterling mount. The button contact closures activate translator
AC power and an internal pulse generator for triggering. This drive rate is adjusted
by a pot on the back of the translator (front panel for TF). All limits are bypassed
when using these local controls. See Figure 28 for button location and Figure 30 for
circuits.
7.3 Traveling Feed Hour Angle Translator
This translator, a Superior Electric model ST1800BV, serial 1154, is mounted
on a chassis and panel along with pulse receiver, local control and connectors J1, J5
and JTF (30 conductor). See Figure 23 for block diagram. See Figure 32 for motorconnections.
- 13 -
7.4 Sterling Mount Hour An&,e_'1'.ra _nslator_
The SM hour angle translator is a Superior Electric model HTR 400, serial
394, high-speed unit matched to drive HS400B motors only. The pulse receiver card
is mounted along side the translator' s circuit cards. See Figure 23 for block
diagram.
7.5 Sterling Mount Rotation Translator
The SM rotation translator is a Superior Electric model HTR1500, serial 14,
high-speed unit matched to drive H51500 stepper motors only.
7.6 Sterling Mount Focus Translator
The SM focus translator is a Superior Electric model HTR1500, serial 15,
high-speed unit matched to drive 1151500 stepper motors only.
failsafe brake mounted on the Sterling mount prevents focus movement due to
weight of the front-end box. The brake (Warner Electric model FB475; 21 lb. ft.
torque) is electrically released only if AC power is present at the translator and if
motor DC current exceeds the 3 amps necessary for adequate motor holding torque.
A brake actuator circuit mounted on the translator, Figure 31, releases the
brake when the motor return current exceeds 3 amps. Current is sensed by the
millivolt drop across a low resistance in series with the motor common.
When AC power to the focus translator is shut off, the AC relay K1 also in-
stantly removes brake voltage so that the brake sets before the motor loses holding
torque.
The brake-release voltage supply (Warner Electric model MCS-805) is
mounted on the translator.
- 14 -
8.0 DRIVE MOTORS
All drive motors are stepping types made by the Superior Electric Company,
Bristol, Connecticut. All motors rotate 1/200 revolution (1.8 degree) per step. All
motor shafts on the Sterling mount are coupled to gearing through elastomeric (rubber
windup) couplings which absorb stepping accelerations and reduce inertial loading.
8.1 Traveling eeL_clol gIrAn le Motor
Model: HS5OL
Torque: 190 oz. inch at 0 to 200 steps/secwith ST1800BV translator
Wiring: See Figure 32.
8.2 Sterling Mount Hour Angle Motor
Model: HS400B
Torque: 450 oz. inch at 0 steps/sec and600 oz. inch at 200 steps/secwith HTR400 translator
Wiring: See Figure 32.
8.3 Sterlin_ Mount Rotation and Focus Motors
Model: HS 1500
Torque: 1300 oz. inch at 0 steps/sec
1000 oz. inch at 100 steps/sec
1100 oz. inch at 400 steps/sec
900 oz. inch at 800 steps/secwith HTR1500 translator
Wiring: See Figure 33.
J35
J7C
ON
SOL
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RO
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L
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P2V
sAD902
Vs
10I■ - LIMIT LIGHT ADJt BECKMAN 58PR1OK
ZERO LIGHT ADJBECKMAN 58PR50
115 V AC
P5■-•••••■-•-••
AD902
CALIBRATION
INSERTION
AND
SWITCHING
CIRCUITS
FIG. 5A
J11E
J11Fy J4_4_
rt HOUR ANGLEI DIGITAL
PANEL METERFIG. 10
115 V AC
+ ANALOG s MULTIPLEXER,BUFFER A/D CONVERTER,
CH. 1 COMPUTERFIG. 11
READ- 51-13OUT S1-20
SVOLT-
1-14
AGES1-15
SOURCE
CARD S1-17
C -1S1-18
FIG. 12S1S1-KS1-16
TEL. INTERCABLE LOCK
READ S3 -NOUT S3-i3
S3 -JVOLT- S3 -7AGE
FOLLOWER
CARD
C-2 S3-3FIG-. 13
S3 -4
S3-12
J340 A J340 A J7CJ304P J3p ) J7D I POSITION POT
y J304H J304H J7A 20 K
J7EJ34D J34D -
aJ3c4J J3J J7B
HOUR ANGLECONSOLE
CONTROLS
FIG. 19
9. 0 VOLT I
STANDARD
FIG. 15
POSITION READOUT CIRCUIT: STERLING MOUNT HOUR ANGLE
FIGURE 4
TEL. INTERCABLE LOCK
r —•-7 -- ". ^ J3 4A n J34 A ,
( I J34B ( I J31B c ) J5B__.r J34E J34E 7Tef-30
00 —()-
J5C
—3 POSITION POTLL 1 K, 10 TURN
CALIBRATION
INSERTION
AND
SWITCHING
CIRCUITS
FIG. 5
AA
ANALOG( I J11A - BUFFER
J11Bo CH. 0
J11C FIG. 11
ft F11:1-07TATTZTE-,DIGITAL
PANEL METERFIG. 10
‘e*
HOUR ANGLECONSOLE
CONTROLS
FIG. 19
9.0 VOLT
STANDARD
FIG. 15
P5+Vs
Corn AD9 02
-Vs
1115 V AC
• 10K/
50
3
READ- S1-3OUT S1-10
VOLT- S1-4AGE
S1-5SOURCE
CARD S1-7
C -1S1-8
FIG. 12
S1-9S 1-KS1-6
READ- S3-MOUT S3-11
VOLT- S3 -HS3-7AGE
FOLLOWER
CARD
C -2S3-3
FIG. 13S3-4
- LIMIT LIGHT ADJBECKMAN 58PR1OK
ZERO LIGHT ADJBECKMAN 58PR50
Pb+Vs
-Vs
AD902115 V AC
MULTIPLEXER,AiD CONVERTER,
COMPUTER
/' J34C it JVC /A--o
J34J J34J 11
J7B—0 .0-- --a
POSITION READOUT CIRCUIT: TRAVELING FEED HOUR ANGLE
FIGURE 3
STER. MT ,, _1-9. 0 v. ADJ
. Out
FIG. 6 -
Y -19)1(
9. 0 V
II
S3-12 ÷/
S3-7
- 19 -
FROM SM RA TOVOLTAGE SM SM SM ANALOGFOLLOWER ZERO +9. 0 V -9. 0 V BUFFER
TEST TEST TEST CH. 1
J11E
J11F
53-14+ ci■/
S3-8_ k
•
TRAV. FEED-9. 0 V ADJ
FIG. 6Out
Out
It
4-
In
6
1,1
13
K1 K2
RELAY CARD,S5-
10
4. HA DPMFIG. 10
TOANALOGBUFFER
CH 0
J11B•J11C
FROM TF HA TF TF TFVOLTAGE ZERO +9. 0 V -9.0 VFOLLOWER TEST TEST TEST
K1 K2
RELAY CARD,S5-
DIGITAL CONSOLE,INTERFACE HA
HR. ANGLEIn SCALE
FIG. 6
v
9. 0 V SC J8•EE J1KUNENERGIZED ON STER. MOUNT: K1 E S5E 8 ,
24 V Corn
SiL J84F F J1FUNENERGIZED ON COMPUTER: K2
JlE
SM/T F
COMP/MAN
+24 V DC
J 1J J1A a 1
PWR ON
gic J1.13 4:51
HOUR ANGLE READOUT: CALIBRATION INSERTION AND SWITCHING CIRCUITS
FIGURE 5
1KBECKMAN58PR1K
0 F. P.
1000, 1%
+OUT
+ IN - IN, OUT I
RELAYCARDC-3
FIG. 14
S5 PS5 NS5 B
Shield
TRAVELING FEED -9. 0 V ADJ (X 0.3300 VOLTAGE DIVIDER)
17.3 K1%
1K
BECKMAN t58PR1K
F. P.
-IN, OUT I■+OUT
+IN 2320, 1%RELAYCARD
C -3
FIG. 14
55 P
55 N55 B
Shield
DIGITRANRED P094-0015 GRN
POGGENDORFBLK VOLTAGE
DIVIDER10 K INPUT R
- 20 -
STERLING MOUNT -9.0 V ADJ (X O. 15152 VOLTAGE DIVIDER)
8060, 1%
HOUR ANGLE SCALE(4-DECADE VOLTAGE DIVIDER IN HOUR ANGLE CONSOLE PANEL)
J3M +IN n •
J3R -IN r•-OUT
J3J +OUT
J3E•
HA CONSOLE PANEL
S5-16RELAY
CARD13, 9
C -3 12FIG. 14
HOUR ANGLE READOUT: ADJUSTMENT CIRCUITS
FIGURE 6
FOLLOWER
CARD
C-2 S3-3FIG. 13
S3-4
+Vs
Corn-V
s
115 V AC
IN___TERCABLE LOCK
-TEL.
---, ,- --A J34F n J34F r‘ J7I A
( I J34G ( I J34G i ) J7H I 1
J34M J3ilyl___Y J7IS. i /
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READ - S2-3OUT S2-10
VOLT- S2-4
AGES2-5
SOURCE
CARD S2-7
C -1S2-8
FIG. 12
I I
50
S2-9S2 -KS2-6
READ - 53-POUT S3-1
S3 -KVOLT S3-9AGE J34T it J34T
J3aN J3iN J7y1
POSITION POT20 K
J11Mc± + ANALOG
( I J1iN BUFFER 1/ en:JP CH. 2
FIG. 11
HOUR ANGLEDIGITAL
- PANEL METERFIG. 10
S3-16 CALIBRATION
INSERTION
AND
ADJUSTMENT
CIRCUITS
FIG. 9
- LIMIT LIGHT ADJBECKMAN 58PR 10K
ZERO LIGHT ADJBECKMAN 58PR50
MULTIPLEXER,A/D CONVERTER,
COMPUTER
POSITION READOUT CIRCUIT: STERLING MOUNT ROTATION
FIGURE 7
HOUR ANGLECONSOLE
CONTROLS
FIG. 20
- 22 -
READ -OUT
VOLT -AGE S2-15
SOURCE
CARD 52-17
C -1 S2-18FIG. 12
52-1352-2052-14
S2-19S2 -L52-16
READ -OUT
VOLT-AGE
FOLLOWER
S3 -R3-1
53 -L3-1
i+Vs P4AD902 115 V AC
- LIMIT LIGHT ADJt BECKMAN 58PR 10KLI
50 e-BECKMAN 58PR50
ZERO LIGHT ADJ
3
TEL. INTER-CABLE LOCK
J34K A J34K A Jr-i A( J34L ) J71S
)- --0 -0- J30 J3V1 J714
JiRJ3 iU c J34IJJ3 Y, J3 iN J7M
POSITION POT20 K
CARD
C -2
FIG. 133-3 V., +
Com AD902 115 V AC3-4
53-18 CALIBRATION
INSERTION
AND
ADJUSTMENT
CIRCUITS
FIG. 9
J11S0--
I I J11To-J11U0-
+ ANALOGBUFFER
CH. 3FIG. 11
FOCUSDIGITAL
PANEL METERFIG. 10
MULTIPLEXER,A/D CONVERTER,
COMPUTER
FOCUS
CONSOLE
CONTROLS
FIG. 21
9.0 VOLT
STANDARD
FIG. 15
POSITION READOUT CIRCUIT: STERLING MOUNT FOCUS
FIGURE 8
_1 ri
DPDTMOM. PUSH •BUTTONS c
+Y-Y
9. 0 V
r
I I
S3-10 /• •
‘* () ANALOGBUFFERCH 3
FIG. 11
/1 4-'. FOCUSDPM
FIG. 10
STERLING MOUNT ROTATION
FROM SM ROTATIONVOLTAGEFOLLOWER ZERO +9. 0 V -9.0 V
TEST TEST TESTS3-16
• +
\
1 _J
DPDTMOM. PUSH•BUTTONS (
+Y->l•
9. 0 V
I3 ,7 5 0 0 , 1%
0 -9. 0 V ADJ
(x 0.2020)/1 -4-
11500, 1%
ANALOGBUFFER
CH 2
FIG. 11
ROTATIONDPM
FIG. 10
1K
BECKMAN58PR1K
S3-9
STERLING MOUNT FOCUS
FROM SM FOCUSVOLTAGEFOLLOWER ZERO +9. 0 V -9. 0 V
TEST TEST TESTS3-18
3010, 1%
BECKMANt (x 0. 6465)
58PR1K5900, 1%
1K 0 -9. 0 V TEST
ROTATION AND FOCUS READOUT: CALIBRATION INSERTION AND ADJUSTMENT CIRCUITS
FIGURE 9
FROM VOLTAGEDIVIDERS ZERO +9.0 VAND RELAYS TEST TEST
nI
( I _1/
-9.0 VTEST
DIGITAL PANEL METER
P2-12
P2-8, 9
P2-1, 15
S5-R •J12-H
S5-17 • 311.-FS5-18 3126-L
S5-7 j J8EE J1K
24 V C4Pom-L-K3
RELAY CARD C-3
FIG. 14
TF/SM
HA PWR
DPDTMOM. PUSH
t
BUTTONSHOUR ANGLE J12
C ROTATION J13+ y--I, FOCUS 314
9. 0 V
it` P1-16P1-X
P1-1 lxxx.P1-16 Gnd
Pl-A lxx. XX-
P1-1 lxxx.xP1-16 Gnd
DECIMAL POINTROTATION ANI)
FOCUS DPMDECIMAL POINTHOUR ANGLEDPM ONLY
+24 V DC
DIGITAL HA CONSOLEINTERFACE PANEL
DIGITAL PANEL METERS: Newport Laboratories, Inc.
Model 2000-3
Range ± 19.999 volts; 4 1/2 digits
Max. Error ± 3 mV
Temp. Coeff. ± 0.3 mV/°C
Sample Rate 4/sec
DIGITAL PANEL METERS: CONNECTIONS AND SPECIFICATIONS
FIGURE 10
-Inp
ut
CA
RD
Omer.
OU
TPU
T
1250
K8
ZER
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+15
V
- 15
V
10
INPU
T11
CU
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FR
EQ
. = 1
0 H
z
22 K
Tri
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-
1.2
549
. 9 K
, 1%
INPU
T
49.9
K, 1
%<
A/-
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orn
182
K,
90. 9
K,
1%
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49. 9
K1%
POSI
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N R
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DO
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: AN
AL
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BU
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AR
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FIG
UR
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1
+
1;.2
00, 7
WD
ale
RH
5W
h20
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7W
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30. 0
V
Blk
TP
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B2 ■
c-
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4-
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-4-
2N39
04
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Posi
tion
Pot
Zer
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ight
MC
1469
R
5 7C
ase
1. 0
Vol
tage
Follo
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50A
dj18 19 20
1. 0
. 0014
11
11111111•0110
T 20
0, 7
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H5
20-2
5 V
TOPB
1k20
0, 7
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RH
5
10 13 14 15 16 17
Posi
tion
Pot
Zer
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ight
Adj
50
Lim
it L
ight
Adj
10
K1
-Lim
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ight
Adj
10 K
B1
4-1
Red+
(ID 30
. 0 V
TP
Blk
- 0
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t Sin
k 2N39
04
+Vs AD
902
-V
4- 11
5 V
AC
+Vs
-v A
D90
2
4- 11
5 V
AC
33.2
K a _
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1% 6810 1%
64
MC
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R
9 87
Case
B 1
41-
Vi
4-
V2
4-
30 V
Vol
tage
Follo
wer
Out27 K
rimOut
Corn Corn
+15
-15ArLI. K
+
• S
14 A ( 1
-8-1 I S
AD 118A
10 K27 K
Trim
OutCorn
1
+ _ In
•
S
>- +
• Out
•
S
-15V
AD 118A
+15 V A
- 27 -
P5Corn
+15 VAD902
-15 V
1•111111111111111MINIP
Ae 5.
115 V4- AC
-15 V
+15 V
27 KTrimOut
Corn16 - Out
1K
10
A
•
+• - Out). S
-15V CARD C-2
READOUT VOLTAGE FOLLOWER CARD C-2
FIGURE 13
- 28 -
7
3 4 A
Kl, K2, K3: P + B R40-E 1-L4-V800
SHOWN UNENERGI ZED
109
M
X
V 2221
19 20
17
READOUT RELAY CARD C -3
5 16
14
1211
13
FIGURE 14
P6
28. 0 V± 1.0 V
+28 V+9 V
CERTAVOLTSTANDARD
Coin-15 V Corn
+15 V
AD904 Corn115 VAC
1N914
4--
9. 0 V/ 3. Out
Certavolt Standard: Codi Semiconductor, Division of Computer Diode Corp.
Model PVS9G
Input: 28. 0 V ± 5%, 20 mA max.
Output: 9. 0000 V ± . 005%, 10 mA max.
± 1 ppm/°C 15 to 55 °C
NINE VOLT STANDARD
FIGURE 15
11011111",
47-W
- 30 -
POSITION READOUT BOX: FRONT AND REAR VIEWS
FIGURE 16
- 31 -
Slot Card No. Card Function
Si C-1 Voltage sources:
Upper circuit: Traveling Feed hour angle
Lower circuit: Sterling mount hour angle
52 C -1 Voltage sources:
Upper circuit: Sterling mount rotation
Lower circuit: Sterling mount focus
S3 C -2 Voltage followers:
Circuits in order from top to bottom;
Traveling feed hour angle
Sterling mount hour angle
Sterling mount rotation
Sterling mount focus54 Spare Spare voltage source card.55 C -3 Relay card: circuits in order from top to bottom:
K1: Sterling mount/Traveling feed select switch
K2: Hour angle: Computer/Manual select switch
K3: Sterling mount/Traveling feed select switch
56 Spare Spare relay card
57 Spare Spare relay card
58 Spare Spare voltage follower card
POSITION READOUT BOX: CARD LOCATIONS AND FUNCTIONS
FIGURE 17
CM
PTR{C
MB
TO
CMA
TWIS
TED
PAIR
J I
TO G
RD
LOG
IC P
IN A
CARD
3IN
TER-
cm 2
FACE
TWIS
TED
PAIR
L
J2A
S. M
OU
NT
E. L
IMIT
S. M
OUN
TS.
MO
UN
T0
W. L
IMIT
T F
TF
El
0TF
E2
T F WI
+24
VT
FW
2
(24V\
kCO
MI
< T. F
EED
STOW
T. FE
EDST
OW
PIN
OUT
H.A
. CO
NT
RO
L
CM
PTR.
S. M
OUN
TP.
O.
MAN
UAL
T. F
EED
STO
PH
I E
LO
ET
RA
CK
ETR
AC
K W
LO W
HI
W
124
V CO
M 4
—
+ 2
4V
r-'
G k
(T+
) I 0.
(T1
m
TO
CA
RD
2&
L 0 -1 '1
0 -1
A0—
D
0-1
BCE
,„71
mN
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f
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+) d
(L+
) h0
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j
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TO LOG
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CE
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1•■■
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30 Cond.
31 35
JTFTF HA
TRANSLATORST 1800BV
MOTOR
LOCALTRIGGER
TRAVELING FEED ISTEPPING
MOTORAND POSITION
POT
TRAVELING FEEDLIMIT SWITCHES,
ETC.
Drive Position
36J34Telescope
CableJ35
31 J5
INTERLOCK
J2 37 33 38 34
J2STERLING MOUNTHA TRANSLATOR
HTR200J2M
33STERLING MOUNTROTATION TRANS-
LATOR HTR1500J3M
34STERLING MOUNTFOCUS TRANS-LATOR HTR1500J4M J4B
■111■■••111MMOM
SMHOUR ANGLE
STEPPINGMOTORHS400B
SMROTATIONSTEPPING
MOTORHS1500
SMFOCUS
STEPPINGMOTORHS1500
FOCUSBRAKE
STERLING MOUNTPOSITION
POTENTIOMETERS
STERLING MOUNTLIMIT AND ZERO
SWITCHES
INTERLOCK: INTERCONNECTION BLOCK DIAGRAM
FIGURE 23
J35D
J35JJ J1F
T FHOUR
ANGLEDRIVE
TRIGGER
HOURANGLE
TRANSLATORTRIGGER
1 / 3•
J35A K14East East
J1A/
CornCornJ1J1C
3 , WestK13 J1D 1
/ Corn
J3413J35E
West •J35C
Corn
J6M
J.6H
K12 J6KShield
10
+ East 1 Limit
4-40
J6L
East 2 LimitJ6E
- 38 -
TF HA Power Off/On
Stow Pin Out Light
Stow Pin In Light
West 2 Light
West 1 Light
HA Zero Light
East 1 Limit Light
East 2 Light
+24 V DC
J34X
8 5
J34W K13
J34a
6 5---• oJ34Z K12
• 5 +J34Y K14
J35h
u‘...cy 3C AC I • •
K5 +Jo1H
J1J4.471 6• •
J6R•
JqwL
TF Translator AC
Translator LocalControl
Stow Pin ReleaseSolenoid
J34g J6N
24 V Com • CJ35j
+
J34V J6CJ6A
J6J
Diodes - 1N4002K4, K13, K14 -KRP11DGK12 - KRP 14DG
West 2 Limit
West 1 Limit
Hour Angle Zero
Telescope Cable Interlock: Relays (Unenergized)
INTERLOCK CIRCUIT: TRAVELING FEED
Limits (Untripped)and Translators
FIGURE 24
2K3
• 11/ 12J35W K15
(RFD)
J34m K11
J34b K7
East VI 3 1\ EastJ350 Kll J2A
Corn CornJ35P J2BJ35H J2C
West
Corn
SMHOUR
ANGLEDRIVE
TRIGGER
HATRANSLATOR
TRIGGERV13_•J35F K7
Y.31G
J3 5M
A Tx,„1.J2D \
CornJ2E. J2 F
HA Power Off/On
East Limit Light
Hour Angle Zero Light
West Limit Light
+24 V DCJ34h
C AC 4-471 63 • HA Translator ACK3 +
Translator Local
J2J ControlK11
2 7
J8MEast Limit
J8N
HA Zero.4 •
K7 J8V
West Limit
J8F
J34m J8U
24 V Corn C Diodes - 1N4002J34j K7, Kll - KRP11DG
Telescope Cable Interlock: Relays (Unenergized) Limits (Untripped)and Translators
INTERLOCK CIRCUIT: STERLING MOUNT HOUR ANGLE
FIGURE 25
+CW 0 10/IJ35T K6
COM J35U
J3 5N-CCW •
J35K K10COM
J3 5L
J35R
SMROTATION
DRIVETRIGGER
ROTATIONTRANSLATOR
TRIGGER
+CWJ3A* I;
• I COM
J3D ICOM
J3J3F
1 3 A -C CW
K2ROTATION POWER 6 5
• •J35m K15
(RED)
+ CW LIMIT LIGHTJ34t K6
-CCW LIMIT LIGHTJ34f K10
+24 V DC • +J34h
24 V Com • CJ34j
ROTATION ZERO LIGHT )„,J34u K8
K6
J8L
Diodes - 1N4002K6, K8, K10 - KRP11DG
J8D
2 8 7 /
J8S
+CW LIMIT
ROTATION ZERO
-CCW LIMIT
144/ 3AC I • • ROTATION TRANSLATORK2 AC4- der-d•--
J3H TRANSLATOR LOCAL•J3J CONTROL
Telescope Cable Interlock: Relays (Unenergized) Limits (Untripped)and Translators
INTERLOCK CIRCUIT: STERLING MOUNT ROTATION
FIGURE 26
CONTROL
- 41 -
SM
1/ I 41 (Rotation Zero
K.8 14/ 1,5 J4A + up+ UP J35X K5K15
COM
J4C
• ^ -DOWNJ4D
t ICOM • COMJ35aJ35S
FOCUSDRIVE
TRIGGER -DOWN • 1/J35Z K9
com Ala J4B
J35Q
J4 y• k
J4F
FOCUSTRANSLATOR
TRIGGER
FOCUS POWER OFF/ON 11 7
K1
2 14471 3. • C ACJ35n 1(12 K1 +
(TF El) Jill TRANSLATOR LOCALJ4J
FOCUS TRANSLATORAC
FOCUS UP LIMIT LIGHT -•---60"--Ej----90.-EJ34c K5
8+
J35b K15RFD LIGHT
FOCUS ZERO LIGHT
DOWN LIMIT LIGHT334s Kg
+24 V DCJ35h
24 V Corn cJ35j
Diodes -1N4002
K9
8
K1
K1, K9 - KRP11DGK5 - KRP14DGK15 - R40-E1-L4-V800
J AJ8B
J8AA
J8BB
J8W
38 Z
J8P
J8R
J8H
J8J
J8CC
J DD
J LJ4K
RESTRICTIVEFOCUS DRIVE
(RED)
FOCUS ZERO
FOCUS DRIVE
FOCUS TRANSLATOR
J34r
''\•■■•■••■••■•■■•■••••■••*•••■•■•\./...•■T••■•...••■•■••■•.■*j
Limits (Untripped)and Translators
INTERLOCK CIRCUIT: STERLING MOUNT FOCUS
FIGURE 27
Telescope Cable Interlock: Relays (Unenergized)
- 42 -
•
•WARNING
NO LIMITS
TRANSLATORS IN TELESCOPE FOCAL CABIN: SM HOURANGLE, ROTATION, FOCUS, TF HOUR ANGLE AND INTER-
LOCK FROM TOP TO BOTTOM
FIGURE 28
390, 2 WJXA
SX3 27 KJXB JXC -Y SX4
560 4100
15-V 4.7 V1N4723A
+15 to 20 V DC
F Translator
G GroundSX7
JXD1
SX9 27 KJXEJXF SX10
390, 2 W
3.3 K
4•7 V1N4723A
SX12R Translator
Trigger PC Card
SX8
•SX6
Connection • TF Hour Angle SM Hour Angle SM Rotation SM Focus
X 1 2 3 4
B Jcn. R3, R5, C2in Translator
Jen. R3, R6, C3in Translator
Jcn. R2, R5, C6in Translator
Jcn. R2, R5, C6in Translator
FTB-A(East)
TB2-6(East)
TB2-7(+ CW)
TB2-6(Up)
G,
TB-C TB2-8 TB2-8 TB2-8
R TB-B(West)
TB2-7(West)
TB2-6(-CCW)
TB2-7(Down)
TRANSLATORS: PULSE RECEIVER CIRCUIT
FIGURE 29
A -
Is. JXH). JXJ
B _ _ )P BB
DPDT momentary push-button switches
Connection TF Hour Angle SM Hour Angle SM Rotation SM Focus
X 1 2 3 4
A East East -CCW Up
B West West +CW Down
C TB-Y TB2-9 TB2-9 TB2-9
AA TB-A TB2-4 TB2-4 TB2-4
BB TB-B TB2-5 TB2-5 TB2-5
TRANSLATORS: LOCAL CONTROL CIRCUITS
FIGURE 30
+15
V1N
4747
A
Tra
nsl
ato
r
ZS
1N91
4
Inte
rloc
kS
terl
ing
Mou
nt
K1 C
lare
PRB
2013
240
10 K
1N91
4
33 K
Tri
m Out
Com
20V
2N39
0410
+15
V
3 •-1
5V
•.0
1
100
KJ4
K•
J8C
C+
9V
620
•
+15V
K1
Foc
us B
rake
FB47
5V
olta
geR
elea
se
1N40
072S
" 1N
937A
Tri
pL
evel
Bra
keP
ower
Supp
lyM
CS
-805
Cor
nJ4
LJ8
DD
To
T2-
4 an
d T
3-4
(Pw
r S
uppl
y)
TB
111
5 V
AC
TB
1
+15
VC
orn
-15
V
,\/
1K
O. 0
10 S
2. 4
7
(13
inch
20
AW
G)
A/
1K
To
TB
1-2
and
TB
1-6
(Mot
or)
(Rem
ove
orig
inal
wir
es)
TR
AN
SL
AT
OR
S: F
OC
US
BR
AK
E R
EL
EA
SE
CIR
CU
IT
FIG
UR
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1
CA
RR
IAG
ET
FJT
F-C
ON
NE
C T
OR
T F
MO
TO
R/R
EA
DO
UT
CA
BL
E T
ER
MIN
AL
MO
TO
RT
RA
NSL
AT
OR
30
CO
ND
UC
TO
R
15 C
ON
DU
CT
OR
ST
RIP
HS5
OL
TB
-1
TB
-2
TB
-2
TB
-3
TB
-4
TB
-5
1 2 3 4 5 6
1 R
ED
2 W
HIT
E
6 B
LA
CK
3 W
HIT
E/R
ED
4 W
HIT
E /
GR
EE
N
5 G
RE
EN
SMT
RA
NSL
AT
OR
J2M
-S
M M
OT
OR
CA
BL
E,
CO
NN
EC
TO
R12
CO
ND
UC
TO
RM
OT
OR
H 5
400B
AT
B1-
1
T B
1-2
TB
1-3
T B
1-4
TB
1-5
T B
1-2
BL
AC
K +
BL
AC
K /W
HIT
E
RE
D +
RE
D /B
LA
CK
OR
AN
GE
+ O
RA
NG
E /B
LA
CK
WH
ITE
+ W
HIT
E /B
LA
CK
GR
EE
N +
GR
EE
N/B
LA
CK
BL
UE
+ B
LU
E /
BL
AC
K
1 R
ED
2 W
HIT
E
3 B
LA
CK
4 W
HIT
E /
RE
D
5 W
HIT
E /
GR
EE
N
6 G
RE
EN
MO
TO
RS:
TR
AV
EL
ING
FE
ED
AN
D S
TE
RL
ING
MO
UN
T H
OU
R A
NG
LE
WIR
ING
FIG
UR
E 3
2
SMT
RA
NSL
AT
OR
JXM
-C
ON
NE
CT
OR
SM
MO
TO
R C
AB
LE
,12
CO
ND
UC
TO
RM
OT
OR
, HS1
500
•
TB
1-1
TB
1-2
TB
1-3
TB
1-4
TB
1-5
TB
1-6
BL
AC
K +
BL
AC
K/W
HIT
E
RE
D +
RE
D/B
LA
CK
OR
AN
GE
+ O
RA
NG
E/B
LA
CK
WH
ITE
+ W
HIT
E/B
LA
CK
GR
EE
N +
GR
EE
N/B
LA
CK
BL
UE
+ B
LU
E/B
LA
CK
RE
D
2 W
HIT
E
3 B
LA
CK
WH
ITE
/RE
D
WH
ITE
/GR
EE
N
6 G
RE
EN
X =
3, R
OT
AT
ION
4, F
OC
US
MO
TO
RS:
ST
ER
LIN
G M
OU
NT
RO
TA
TIO
N A
ND
FO
CU
S W
IRIN
G
FIG
UR
E 3
3
- 48 -
oitive
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PHOTOS OF TRAVELING FEED:Fifty-foot Track seen from Below (bottom);
Carriage with 110-240 MHz Feed (top)
FIGURE 34
- 49 -
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PHOTOS OF STERLING MOUNT:Full View from West Side (bottom);
Full View from South Side (top)
FIGURE 35
- 50 -
x 's*•
tft
PHOTOS OF STERLING MOUNT:Hour Angle Motor and Drive (bottom);
Hour Angle Zero Switch (top)
FIGURE 36
- 51 -
PHOTOS OF STERLING MOUNT:Rotation Zero Switch, Drive Spline and Ring-gear (bottom);
Rotation Limit Switches and a Focus Drive Screw (top)
FIGURE 37
- 52 -
,
•
,
PHOTOS OF STERLING MOUNT:Rotation Motor and Position Readout Pot (bottom);
Focus Motor and Brake (top)
FIGURE 38