This page is part of the ING manual INS-DAS-29
manual for UltraDAS.
UltraDAS in an instrument change
Equipment to be mounted on the telescope
The CCD plus its controller must be mounted on the appropriate camera of
the spectrograph. The CCD controller is mounted to the instrument independently
of the cryostat.
When putting a CCD plus controller on the 235 camera of IDS, the lifting
is much easier if the mounting flange is vertical. Slew the telescope in
declination to about 30 degrees North.
The power supply (grey box) and shutter electronics for UltraDAS are
in a separate rack. Normally, they are mounted in the same rack as the
All the CCD-control equipment of the WFC is mounted on the instrument's
frame. This equipment should be assembled on the frame before the instrument
is put on the telescope.
The CCD controller is mounted to the cryostat with a set of hoops. The
controller should be at the top when the WFC is on its handling trolley.
The PSU for the CCD controller is mounted on the instrument's frame.
It is at the left-hand side when the instrument is on its trolley.
Cabling for the CCDs is in the main loom that passes through the WFC's
mast and across the west arm of the spider.
WHT WFC at UES
The cryostat mounts on to UES in the traditional way. The detector controller
for WHTWFC is not mounted onto the cryostat; it can be rested on top of
the UES casing next to the cryostat and needs no restraints. The rack with
the PSU and shutter controller can also be rested on top of UES' case.
WHT WFC on PFIP
The cryostat mounts on to PFIP in the traditional way.
The detector controller is bolted directly to the instrument frame,
to the side of the cryostat.
The shutter controller and PSU are held in a casing that mounts on top
of the detector controller, with the shutter controller's indicator lamps
showing at end furthest from the telescope's primary.
At the instrument
The cable for clocks and pixel-value signals connects to boards inside
the controller and emerges from the CCD-controller through the gap in the
front panel of the controller box. This cable runs to the multi-pin
connector on the side of the cryostat. This connection should only be made
or broken in static-free surroundings, before the cryostat is brought to
Cable from the temperature port on the controller
front panel to temperature port on the cryostat. This cable carries
telemetry from the cryostat to the controller and allows the controller
to raise the cryostat's temperature to its working value by operating a
heater inside the cryostat.
Cable from the ID port on the controller
front panel to the ID plug on the outside of the cryostat. This cable
allows the DAS to sense which controller is connected. If the ID cable
is left off, the DAS will refuse to drive the camera.
Cable from the shutter-control port on the controller
front panel to the socket marked "from SDSU" on the shutter-control
rack. This allows the controller to command the shutter and to sense the
shutter's position. The INT WFC does not have this cable, because the shutter
is driven by the ICS.
Cable from the socket marked "to shutter" on the shutter-electronics
rack to the shutter on the instrument body. The connection at the instrument
Cable from the detector controller's PSU to the controller itself. Note
that there are two different types of PSU and they are matched to power-conditioning
boards in the controller. The cables for the two PSUs are different.
There is a socket marked "slit shutter" on the IDS instrument-controller.
The INT WFC doesn't have this connection.
Supply mains power (240V 50Hz AC) to the dector controller's PSU
and (separately) to the shutter controller.
Attach fibre optic connections (one pair) from the DAS to the detector
controller. At the controller, the fibres and sockets are each marked "To
CCDC" or "from CCDC"; match the labels on the cables and sockets. (Swapping
over the fibres in the pair disables the controller.) At the other end
of htis first fibre-segment, the arrangements vary.
For IDS, connect to the panel marked "CLIP centre" (not the panel
marked "control room") on the on the Cassegrain rotator.
For INT WFC, connect the first fibre run to the sockets with matching labels
in the blue connection box on the instrument's mast.
For WHTWFC at UES, connect the fibres to the fibre-distribution box on
the opposite side of the UES platform from the cryostat. Two sockets on
the distribution box are marked "To DAS" and "From DAS". Use these, and
match the labels on the sockets to the labels on the fibres.
At the DAS
Fibre-optic connections must be made in the room where the DAS
computer is kept.
In the INT:
At the WHT:
Make fibre-optic connections in the autoguider cabinet of the CLIP centre.
Connect the two fibres labelled "to CCDC" and "from CCDC" to the sockets
with matching labels in the Cassegrain section of the patch panel. Do not
cross these fibres over.
Make fibre-optic connections at the the DAS
computer in the CLIP centre. A pair of fibres emerges from beneath
the floor under the desk on which the DAS computer is mounted; the fibres
are marked "to DAS" and "from DAS". Ensure that these fibres are plugged
into the sockets with matching labels at the back of the DAS computer.
Do not cross these fibres over.
Make fibre-optic connections in a blue equipment-cabinet of the control
room, behind the observer's desk. The cabinet is the one on the right of
the row. Connect the two fibres labelled "to CCDC" and "from CCDC"
to the sockets with matching labels in the UES or prime sections of the
patch panel, as appropriate to the instrument in use; note that the connections
have to be physically moved to change between instruments. Do not cross
these fibres over.
Make fibre-optic connections at the the DAS
computer in the control room. A pair of fibres emerges from the back
of the observer's desk; the fibres are marked "to DAS" and "from DAS".
Plug the "To DAS" fibre into the "Rx" socket on the back of the DAS computer
and the "From DAS" fibre into the "Tx" socket (the socket labels are printed
on the fibre card).
UltraDAS uses configuration files to define certain behaviours of the system.
The files are described in detail in INS-DAS-25.
When changing to camera CCC with instrument III on computer NNN say,
then UltraDAS must be able to see the following files:
Configuring the VAX ICS on the WHT
The ADAM system on the VAXen traditionally contains parts of a data-acquisition
system. Those features are not used with UltraDAS and must be turned off.
This setting is permanent; it will persist across restarts of ICL. When
you want to use the instrument in question with the ADAM DAS, run confedit
as above and reverse the changes.
Log in to the ICS computer as observer.
When asked "do you want to run the observing system?", answer yes.
In the configuration file displayed by confedit, find the section
describing the detector options.
Add (or enable, by removing the comment marker from the start of the line)
the option for which the "detector" is SDSU; comment out the current option
by puting an exclamation mark at the start of the line.
Exit from confedit.