Large Synoptic Survey Telescope (LSST)
Utilities and Services Interface between
the Camera and Telescope
Jacques Sebag
LSE-64
Latest Revision Date: February 17, 2017
DRAFT
This LSST document has been approved as a Content-Controlled Document. Its contents are subject to
configuration control and may not be changed, altered, or their provisions waived without prior
approval. If this document is changed or superseded, the new document will retain the Handle
designation shown above. The control is on the most recent digital document with this Handle in the
LSST digital archive and not printed versions.
The contents of this document are subject to configuration control and may not be changed, altered, or their provisions
waived without prior approval.
i
Change Record
Version
1
2
Date
Description
Owner name
5/1/2012
Initial Version
Jacques Sebag
10/28/2014
Update to advance maturity & update to optical
fiber requirements. Implementation of changes
approved via LCRs 177, 256
B. Selvy
12/5/2016
Implemented proposed changes as per LCR-497.
(Pending approval)
K. Wesson
2/17/2017
Redline version with new proposed requirements
for compressor cabinet and other various
clarifications and corrections.
Martin Nordby, K.
Wesson
The contents of this document are subject to configuration control and may not be changed, altered, or their provisions
waived without prior approval.
ii
Table of Contents
Introduction and Scope................................................................................................................................ iv
1
2
3
4
Camera Cable Wrap and Top End Utilities Routing .......................................................................... 1
1.1
Disconnects at Stationary End of Cable Wrap Provider ............................................................ 1
1.2
Camera Lines ............................................................................................................................. 1
1.3
Top End Camera Cable Wrap Characteristics ........................................................................... 1
Camera Utilities Lines........................................................................................................................ 3
2.1
Refrigerant Lines ....................................................................................................................... 3
2.2
Optical Fiber Lines ..................................................................................................................... 6
2.3
Signal Copper Lines ................................................................................................................... 8
2.4
Power Cable .............................................................................................................................. 8
2.5
Compressed Air ......................................................................................................................... 9
2.6
Camera Cooling ....................................................................................................................... 10
Maintenance Platform Utilities ....................................................................................................... 11
3.1
Power Outlet ........................................................................................................................... 11
3.2
Ethernet Network ................................................................................................................... 11
3.3
Interlocks................................................................................................................................. 12
Compressor Cabinet Utilities .......................................................................................................... 12
4.1
Compressor Cabinet Utilities Interface Points ................................................................. 12
4.2
Compressor Cabinet Coolants ........................................................................................... 13
4.3
Compressor Cabinet Power................................................................................................ 16
4.4
Compressor Cabinet Access Platform Utilities ................................................................ 17
4.5
Compressor Cabinet ............................................................................................................ 17
The contents of this document are subject to configuration control and may not be changed, altered, or their provisions
waived without prior approval.
iii
The LSST Utilities and Services Interface between the
Camera and Telescope
Introduction and Scope
This interface requirement document describes the utilities and services interfaces between the
Telescope and the Camera when the Camera is mounted on the telescope. It describes the camera cable
wrap provided by the Telescope, the camera dedicated lines located on the telescope provided by the
telescope and the camera lines located at the back of the utility trunk provided by the camera. It includes
also the interfaces regarding the utilities provided by the telescope at the deployable platforms. Both the
camera cooling loop and the refrigeration cooling loop systems are included in this interface.
The contents of this document are subject to configuration control and may not be changed, altered, or their provisions
waived without prior approval.
iv
The LSST Utilities and Services Interface between the
Camera and Telescope
1 Camera Cable Wrap and Top End Utilities Routing
The telescope provides the cable wrap to support the utility lines from the back of the camera utility trunk to the
interconnect panels.
1.1 Disconnects at Stationary End of Cable Wrap Provider
ID: CA-TS-UTI-ICD-0030
Last Modified: 4/9/2013
Specification: The telescope shall provide disconnects as described in LSE-64 for all camera utility lines, cabling and
fibers at or near the stationary end of the cable wrap.
1.2 Camera Lines
ID: CA-TS-UTI-ICD-0002
Last Modified: 2/17/2017
Specification: The camera shall provide a set of dedicated lines exiting the back of the utility trunk located as per
LSE-18, sheet 5, to connect to the lines from the camera top end cable wrap provided by the telescope. The
camera lines shall extend to and be supported by the bulkhead plate, the position of which is defined in LSE-18,
sheet 5.
1.3 Top End Camera Cable Wrap Characteristics
1.3.1
Top End Camera Cable Wrap Provider
ID: CA-TS-UTI-ICD-0001
Last Modified: 4/23/2013
Specification: The telescope shall provide the top end camera cable wrap.
1.3.2
Top End Camera Cable Wrap Sizing
ID: CA-TS-UTI-ICD-0024
Last Modified: 4/23/2013
Specification: The top end camera cable wrap shall be sized to accommodate all of the utility lines, cables, and
fibers described in LSE-64.
1.3.3
Top End Camera Cable Wrap Minimum Bend Radii
ID: CA-TS-UTI-ICD-0025
Last Modified: 4/23/2013
Specification: The top end camera cable wrap's minimum bend radii shall exceed the minimum requirements
established by the selected manufacturers for the cyclic life of the camera.
1.3.4
Top End Camera Cable Wrap Twisting
The contents of this document are subject to configuration control and may not be changed, altered, or their provisions
waived without prior approval.
1
ID: CA-TS-UTI-ICD-0026
Last Modified: 2/17/2017
Specification: The top end camera cable wrap shall be installed such that it does not impart twisting in excess of
that allowed by the manufacturer.
1.3.5
Top End Camera Cable Wrap Support and Restraint
ID: CA-TS-UTI-ICD-0027
Last Modified: 10/15/2014
Specification: The top end camera cable wrap lines, cables, and fibers shall be supported and restrained to prevent
snagging, pulling, or hanging outside the bounds of the cable way, including tie-offs directly next to every fitting
and connector at each end.
1.3.6
Top End Camera Cable Wrap Forces
ID: CA-TS-UTI-ICD-0028
Last Modified: 2/17/2017
Specification: The top end camera cable wrap shall impart no direct forces on the lines it supports beyond the
weight and inertial loads of the line and connectors placed on it except where strain relief is incorporated.
1.3.7
Top End Camera Cable Wrap Auxiliary Support
ID: CA-TS-UTI-ICD-0029
Last Modified: 2/17/2017
Specification: The top end camera cable wrap shall have auxiliary support on the rotating end to support the lines
extending to the disconnect at the bulkhead plate back end of the utility trunk, as described in CA-TS-UTI-ICD0002.
Discussion: requirements on free and fixed degrees of freedom and allowed loads imparted on the camera by this
auxiliary support are detailed LSE-80
1.3.8
Bulkhead Plate
ID: CA-TS-UTI-ICD-0047
Last Modified: 2/17/2017
Specification: The telescope shall provide the bulkhead plate for supporting the interconnects between cable wrap
and camera utility lines.
Discussion: requirements on mechanical interfaces and loads associated with the bulkhead plate are described in
LSE-80.
1.1.1
Isolation Valves
ID: CA-TS-UTI-ICD-0048
Last Modified: 2/17/2017
Specification: The telescope shall provide an isolation valve assembly for each refrigerant line, on the stationary
side of the cable wrap, as defined in LSE-164.
The contents of this document are subject to configuration control and may not be changed, altered, or their provisions
waived without prior approval.
2
Discussion: requirements on fittings and lines and a schematic of the isolation valve assembly are defined in LSE164
2 Camera Utilities Lines
2.1 Refrigerant Lines
2.1.1
Refrigerant Lines
ID: CA-TS-UTI-ICD-0003
Last Modified: 10/15/2014
Specification: The Telescope shall provide, install, and test dedicated camera cryo-circuit and cold-circuit
refrigerant lines from the connections on the back of the Utility Trunk to the dome lower enclosure where they
connect up to lines coming from the facility (defined in LSE-65). If custom fittings (not commercially available) are
required for these lines, they shall be provided by the Camera team for installation on the summit.
2.1.2
Cryo Refrigerant Lines
ID: CA-TS-UTI-ICD-0005
Last Modified: 4/23/2013
Specification: The Telescope-provided cryo refrigerant lines shall be composed of 6 main supply lines plus 1 spare,
6 liquid phase supply lines plus 1 spare, and 6 return lines plus 1 spare.
The required characteristics of the lines are given in the table below.
Description
Value
Unit
Name
Main Supply Inside Diameter for flexible line
0.31 (TBR)
inches
Main Supply Inside
Diameter Flexible
Line
Liquid Supply Inside Diameter for flexible line
0.20 (TBR)
inches
Liquid Supply Inside
Diameter Flexible
Line
Return Line Inside Diameter Flexible Line
0.62 (TBR)
inches
Return Line Inside
Diameter Flexible
Line
Main Supply Inside Diameter Hard Line
0.305
(TBR)
inches
Main Supply Inside
Diameter Hard Line
Liquid Supply Inside Diameter Hard Line
0.21 (TBR)
inches
Liquid Supply Inside
Diameter Hard Line
Return line Inside Diameter Hard Line
0.62 (TBR)
inches
Return line Inside
Diameter Hard Line
The contents of this document are subject to configuration control and may not be changed, altered, or their provisions
waived without prior approval.
3
Description
Value
Unit
Name
Supply Line Maximum Expected Operating Pressure (MEOP):
375
psi
Supply Line
Maximum Expected
Operating Pressure
(MEOP)
Return Line Maximum Expected Operating Pressure (MEOP):
375
psi
Return Line
Maximum Expected
Operating Pressure
(MEOP)
testing proof pressure
600
psi
Line Proof Pressure
2.1.3
Cold Refrigeration Lines
ID: CA-TS-UTI-ICD-0006
Last Modified: 4/23/2013
Specification: The Telescope-provided cold refrigerant lines shall be composed of 2 main supply lines plus 1 spare
and 2 return lines plus 1 spare.
Their main characteristics are given in the table below.
Description
Value
Unit
Name
Main Supply Inside Diameter for flexible line
0.31 (TBR)
inches
Main Supply Inside
Diameter Flexible
Line
Return Line Inside Diameter Flexible Line
0.62 (TBR)
inches
Return Line Inside
Diameter Flexible
Line
Main Supply Inside Diameter Hard Line
0.305
(TBR)
inches
Main Supply Inside
Diameter Hard Line
Return line Inside Diameter Hard Line
0.62 (TBR)
inches
Return line Inside
Diameter Hard Line
Supply Line Maximum Expected Operating Pressure (MEOP):
375
psi
Supply Line
Maximum Expected
Operating Pressure
(MEOP)
Return Line Maximum Expected Operating Pressure (MEOP):
375
psi
Return Line
Maximum Expected
Operating Pressure
The contents of this document are subject to configuration control and may not be changed, altered, or their provisions
waived without prior approval.
4
Description
Value
Unit
Name
(MEOP)
testing proof pressure
2.1.4
600
psi
Line Proof Pressure
Refrigerant Lines Temperature Differential
ID: CA-TS-UTI-ICD-0007
Last Modified: 4/23/2013
Specification: The Telescope & Site Team shall select refrigerant line materials and establish runs up the telescope
structure through the dome to be compatible with up to +4 /- 15C temperature differential of the refrigerant with
respect to ambient temperature.
2.1.5
Refrigerant Temperature Differential
ID: CA-TS-UTI-ICD-0008
Last Modified: 4/23/2013
Specification: The camera shall ensure that the temperature of the refrigerant exiting the camera/ refrigeration
system be within +4/-15 C of ambient temperature.
2.1.6
Refrigerant Peak Pressure
ID: CA-TS-UTI-ICD-0032
Last Modified: 4/10/2013
Specification: The camera shall ensure that the peak pressure of the refrigerant never exceeds the MEOP defined
in CA-TS-ICD-0005 and CA-TS-ICD-0006.
2.1.7
Refrigerant Compatibility
ID: CA-TS-UTI-ICD-0009
Last Modified: 4/27/2012
Specification: Wetted surfaces of all refrigerant lines shall be compatible with refrigerants R14, R123, R134, R404,
and R 507, and argon and nitrogen
2.1.8
Stainless Steel Tubing
ID: CA-TS-UTI-ICD-0010
Last Modified: 4/10/2013
Specification: All refrigerant hard runs shall use seamless austenitic stainless steel tubing joined with fusion GTAW
welds
2.1.9
Stainless Steel Tube Fittings
ID: CA-TS-UTI-ICD-0045
Last Modified: 10/15/2014
Specification: Tubing disconnects shall only be used where field connection or disconnection is required for
installation or servicing needs.
2.1.10
Quick Disconnects
The contents of this document are subject to configuration control and may not be changed, altered, or their provisions
waived without prior approval.
5
ID: CA-TS-UTI-ICD-0011
Last Modified: 10/15/2014
Specification: Line runs to the Utility Trunk shall be flexible lines, each terminated by a quick disconnect (TBR).
The quick disconnect shall be TBD.
2.1.11
Continuous Flexible Hoses
ID: CA-TS-UTI-ICD-0033
Last Modified: 10/15/2014
Specification: Flexible refrigerant hoses shall be used in cable wraps, drapes, and at the final connection at the
back of the Utility Trunk, only.
2.1.12
Flexible Refrigerant Hose Liner
ID: CA-TS-UTI-ICD-0034
Last Modified: 10/15/2014
Specification: All flexible refrigerant hoses shall have a smooth bore polyamide liner to minimize diffusion,
compatible with the materials defined in CA-TS-UTI-ICD-0009.
2.1.13
Flexible Line Testing
ID: CA-TS-UTI-ICD-0044
Last Modified: 4/29/2013
Specification: The Camera team shall be responsible for testing the selected flexible line tubing to ensure that it is
compatible with the designed refrigeration system.
2.1.14
Hose Fittings
ID: CA-TS-UTI-ICD-0012
Last Modified: 10/15/2014
Specification: Refrigerant hose fittings shall be all metal or metal with replaceable gaskets or O-rings. Refrigerant
fittings and hose shall be cleaned then crimped clean per manufacturer specification.
2.1.15
Hose Purging and Testing
ID: CA-TS-UTI-ICD-0013
Last Modified: 10/15/2014
Specification: Refrigerant hose assemblies shall be purged with dry nitrogen and capped during transport and
installation. Hose assembly acceptance testing shall include pressure proof testing and leak checking per TBD spec.
2.1.16
Completed Circuit Purge, Proof Test and Leak Test
ID: CA-TS-UTI-ICD-0031
Last Modified: 4/30/2013
Specification: After installation of all the lines, the Telescope and Site team shall purge, pressure proof test, and
leak-check with the maximum allowed leak rate of TBD all refrigerant completed circuits.
Discussion: This is to be done once after the initial installation of the lines.
2.2 Optical Fiber Lines
The contents of this document are subject to configuration control and may not be changed, altered, or their provisions
waived without prior approval.
6
The camera requires dedicated optical fibers to transfer the image data (DAQ) and for communications (CCS).
2.2.1
Optical Fiber Lines
ID: CA-TS-UTI-ICD-0014
Last Modified: 2/17/2017
Specification: The telescope shall provide, install, and test 12 x 24-strand cables (For DAQ), 1 x 24-strand cable (for
CCS) from the connections on the back of the utility trunk and 1x 24-strand cable (for CCS) from the compressor
cabinet interface point under the telescope floor, all running to the computer room interface panel.
Discussion: This results in a total of 14 cables with 24 strands per cable. The fibers for DAQ are used for image
data transport; the fibers for CCS are used for command, control, and telemetry. The 12 cables for DAQ represent
6 cables that are lit and another 6 that are “dark” for spares. Fibers and connectors have the characteristics
defined in CA-TS-UTI-ICD-0035 and -0036.
2.2.2
DAQ Optical Fibers
ID: CA-TS-UTI-ICD-0035
Last Modified: 10/15/2014
Specification: The telescope-provided 24-strand DAQ optical fibers shall have the following characteristics:
* OM3 50/125 multi-mode fiber type with MTP/MPO connectors.
* A maximum fiber length of 145 m from the Utility Trunk to the computer room.
* Three disconnects between the camera cable wrap and the optical fiber termination in the computer room. The
three disconnects are as follows:
1.
2.
3.
One disconnect between the camera cable wrap and the Mount Top End;
One disconnect between the fiber cables coming from the telescope and the Azimuth Cable Drape; and
One disconnect between the Azimuth Cable Drape and the fiber cables that continue in the summit facility
building.
Discussion: From a system perspective, there are two additional disconnects: 4) one between the camera optical
fiber pig tails and the camera cable wrap and 5) one between the optical fiber terminating in the computer room
and the DAQ computers.
2.2.3
CCS Optical Fiber
ID: CA-TS-UTI-ICD-0036
Last Modified: 2/17/2017
Specification: The two telescope-provided 24-strand CCS optical fiber shall have the following characteristics:
* OM3 50/125 multi-mode fiber type with MTP/MPO connectors.
* A maximum fiber length of 145 m from the Utility Trunk to the computer room.
* Three disconnects between the camera cable wrap and the optical fiber termination in the computer room. The
three disconnects are as follows:
1.
2.
3.
One disconnect between the camera cable wrap and the Mount Top End;
One disconnect between the fiber cables coming from the telescope and the Azimuth Cable Drape; and
One disconnect between the Azimuth Cable Drape and the fiber cables that continue in the summit facility
building.
The contents of this document are subject to configuration control and may not be changed, altered, or their provisions
waived without prior approval.
7
* Two disconnects between the compressor cabinet interface point and the optical fiber termination in the
computer room. The two disconnects are as follows:
1.
2.
One disconnect between the fiber cables coming from the telescope and the Azimuth Cable Drape; and
One disconnect between the Azimuth Cable Drape and the fiber cables that continue in the summit facility
building.
Discussion: From a system perspective, there are two additional disconnects: one between the camera optical
fiber pig tails and the camera cable wrap or compressor cabinet interface point and pigtails from compressor units,
and one between the optical fiber terminating in the computer room and the CCS servers.
2.3 Signal Copper Lines
The camera requires dedicated copper lines for communicating signals for the camera protection system.
These lines originate at the utility trunk and run to the compressor cabinets and the computer room.
2.3.1
Signal Copper Lines
ID: CA-TS-UTI-ICD-0015
Last Modified: 2/17/2017
Specification: The Telescope shall provide, install and test 2 shielded copper cables with 18 twisted-pair, 26 AWG
copper wires in each from the connections on the back of the Utility Trunk with one running to the dome lower
enclosure, where it connects up to a line coming from the facility (See LSE-65), and the second running to the
compressor cabinet central interface point under the TMA floor, per LSE-164. Cables shall be IGUS CF11-01-18-02
or equivalent.
2.3.2
Signal Copper Line Connector Type
ID: CA-TS-UTI-ICD-0016
Last Modified: 2/17/2017
Specification: The telescope-provided copper cables shall be terminated at the Utility Trunk, at the interface to the
lines running from the facility, and at the compressor cabinet central interface point with connectors as defined in
LSE-164.
2.3.3
Signal Copper Line Break-out Box
ID: CA-TS-UTI-ICD-0049
Last Modified: 2/17/2017
Specification: The telescope-provided copper cable running to the facility interface shall include a break-out box
located on the stationary side of the top end cable wrap, near the refrigerant isolation valve assembly, with
connectors as defined in LSE-164.
Discussion: This break-out box allows for wiring camera-supplied pressure monitors at the isolation
valves and remotely reading them out.
2.4 Power Cable
The contents of this document are subject to configuration control and may not be changed, altered, or their provisions
waived without prior approval.
8
2.4.1
Power
ID: CA-TS-UTI-ICD-0017
Last Modified: 10/15/2014
Specification: The Telescope shall provide, install, and test a dedicated power feed to the camera by way of a
flexible power line connecting to the Utility Trunk. The power line shall be a single 380Y/220 V, 3-phase, 50 Hz
circuit. The cable shall be shielded, continuous flex, three-phase, with five 10 mm2 (~8 AWG) conductors. The
power shall be UPS-protected with an isolation transformer.
Discussion: Igus cable CF31-100-05 meets these requirements. The specified cable results in the following
maximum current and power values for the camera:




Maximum continues service current per phase = 44 A;
Maximum total continuous service 3Ø power @ 380Y/220 V = 29 kVA;
Maximum total continuous 3 Ø balanced load = 23.2 kVA (80% current capacity per NEC);
Maximum total continuous load per phase = 7.7 kVA (80% current capacity per NEC).
2.4.2
Power Consumption
ID: CA-TS-UTI-ICD-0037
Last Modified: 4/30/2013
Specification: The Camera shall not draw more power than the peak power allocation provided by the telescope
as defined in CA-TS-UTI-ICD-0017.
2.4.3
Power Cable Connector
ID: CA-TS-UTI-ICD-0018
Last Modified: 2/17/2017
Specification: The Telescope-provided power cable shall use connectors as defined in LSE-164.
2.5 Compressed Air
2.5.1
Compressed Air Coupling - Camera Supplied
ID: CA-TS-UTI-ICD-0038
Last Modified: 2/17/2017
Specification: The camera-supplied compressed air line shall use connectors as defined in LSE-164.
2.5.2
Compressed Air
ID: CA-TS-UTI-ICD-0019
Last Modified: 10/15/2014
Specification: The Telescope shall provide compressed air to the camera by way of a flexible line connecting to the
Utility Trunk bulkhead panel. Compressed air pressure shall be between 100-140 psi with a minimum peak flow
rate of 20 scfm.
2.5.3
Camera Compressed Air Quality
ID: CA-TS-UTI-ICD-0039
Last Modified: 2/17/2017
Specification: The Telescope shall provide filtered and dry air meeting or exceeding the requirements of ISO 8573-
The contents of this document are subject to configuration control and may not be changed, altered, or their provisions
waived without prior approval.
9
1 Class 1.3.1.
Discussion: The ISO 8573-1 classification defines levels of particles (1st digit), humidity and liquid water (2nd
digit), and total oil (3rd digit). A classification of 1.3.1 means:



Less than or equal to 20,000 particles of size 0.1 to 0.5 microns, less than or equal to 400 particles of size 0.5
to 1 microns, and less than or equal to 10 particles of size 1 to 5 microns.
A dew point of less than or equal to -20 deg. Celsius; and
Total oil of less than or equal to 0.01 mg/m^3.
2.5.4
Compressed Air Coupling - Telescope Supplied
ID: CA-TS-UTI-ICD-0020
Last Modified: 2/17/2017
Specification: The telescope-supplied compressed air line shall use connectors as defined in LSE-164.
2.6 Camera Cooling
2.6.1
Camera Coolant Supply
ID: CA-TS-UTI-ICD-0040
Last Modified: 12/5/2016
Specification: The Telescope and Site team shall supply Dynalene HC-20 coolant to the camera by way of a flexible
line connecting to the Utility Trunk bulkhead panel with the following characteristics:
Description
Value
Unit
Name
Coolant Maximum Operating Pressure
80
psi
Util_Coolant_Supply_
Pressure_MaxOp
Coolant Maximum Design Pressure (maximum allowable pressure)
150
psi
Util_Coolant_Supply_
Pressure_MaxDesign
Coolant Minimum Supply Temperature
-10
Celsius
Util_Coolant_Supply_
Temp_Min
6.0 +/0.5
Celsius
Util_Coolant_Supply_
Temp_BelowAmbient
Coolant Minimum Flow Rate
15
gpm
Util_Coolant_FlowRa
te_Min
Minimum pressure drop across the camera from supply to return of
at least Util_Min_TelDesign_PressureDrop at the
15
psi
Util_Min_TelDesign_
PressureDrop
Coolant Supply Temp Below Ambient
Util_Coolant_FlowRate_Min
2.6.2
Camera Coolant Return
The contents of this document are subject to configuration control and may not be changed, altered, or their provisions
waived without prior approval.
10
ID: CA-TS-UTI-ICD-0041
Last Modified: 12/5/2016
Specification: The camera shall use a mixing valve. The camera shall not reject more than
Cam_Coolant_Heat_Load into the coolant stream.
Discussion: A mixing valve will minimize the effect of the camera thermal control on the top end thermal control.
Description
Value
Unit
Name
4.5
kW
Util_Coolant_Cam_H
eat_Load
Camera Maximum Heat Load Rejected to the Coolant Circuit
2.6.3
Camera Coolant Line Connector - Telescope Side
ID: CA-TS-UTI-ICD-0042
Last Modified: 12/5/2016
Specification: The telescope-supplied coolant lines shall use connectors as defined in LSE-164.
2.6.4
Camera Coolant Line Connector - Camera Side
ID: CA-TS-UTI-ICD-0043
Last Modified: 12/5/2016
Specification: The camera-supplied coolant interface shall use connectors as defined in LSE-164.
2.6.5
Camera Coolant Pressure Drop
ID: CA-TS-UTI-ICD-0046
Last Modified: 12/6/2016
Specification: The camera shall ensure that the maximum pressure drop across the camera from supply to return
lines at the minimum flow rate shall be no more than Util_Min_TelDesign_PressureDrop.
3 Maintenance Platform Utilities
The Telescope provides utilities and services at the level of the maintenance platforms.
3.1 Power Outlet
ID: CA-TS-UTI-ICD-0021
Last Modified: 10/15/2014
Specification: The Telescope & Site team shall provide 1x 10-amp 220 VAC 50 Hz circuit on each platform, each
feeding a quad outlet box located within 1 meter of the camera when the platforms are deployed.
3.2 Ethernet Network
ID: CA-TS-UTI-ICD-0022
Last Modified: 2/17/2017
Specification: The Telescope shall provide wired internet access to the summit network available to the camera
team within 1 meter of the camera on each of the deployed platforms.
The contents of this document are subject to configuration control and may not be changed, altered, or their provisions
waived without prior approval.
11
Discussion: See LSE-78 for more information on the summit network.
3.3 Interlocks
ID: CA-TS-UTI-ICD-0023
Last Modified: 2/17/2017
Specification: The Telescope shall provide emergency off safety interlocks on each platform within 1 meter of the
camera when the platforms are deployed. These shall directly cut power to the hexapod and rotator, bypassing
the telescope control system software.
Discussion: This emergency stop is connected to the global emergency stop. The 1 meter distance is included to
ensure that an interlock is sufficiently close to personnel when they are in close proximity to the camera while also
avoiding interference with the deployable platforms.
4 Compressor Cabinet Utilities
4.1 Compressor Cabinet Utilities Interface Points
4.1.1
Utilities Interface Point
ID: CA-TS-MEC-ICD-0050
Last Modified: 2/17/2017
Specification: The telescope shall provide a single interface point for locating all power, coolant,
networking, and camera signal line connectors to compressor cabinets.
Discussion: This allows for one point for access and connection/disconnection.
4.1.2
Utilities Lines Routing
ID: CA-TS-MEC-ICD-0051
Last Modified: 2/17/2017
Specification: The telescope shall provide TBD x TBD m region and mounting points for routing camera
utilities from the central interface point to each separate location for compressor cabinet installation.
Discussion: This allows for camera installation of cable ways, conduit, and pipe hangers for routing
lines.
The contents of this document are subject to configuration control and may not be changed, altered, or their provisions
waived without prior approval.
12
4.1.3
Camera Utilities Lines
ID: CA-TS-MEC-ICD-0052
Last Modified: 2/17/2017
Specification: The camera shall provide all lines and connection from the central interface point to all
compressor cabinets, including all cable ways, conduit, and any supports needed.
Discussion: This covers all utilities lines from the central interface point.
4.1.4
Refrigerant Line Routing
ID: CA-TS-MEC-ICD-0053
Last Modified: 2/17/2017
Specification: The telescope shall route refrigeration lines to each of the compressor cabinets and
terminate them as defined in LSE-164.
Discussion: This covers routing of refrigerant lines from the camera on the telescope top end.
4.2 Compressor Cabinet Coolants
4.2.1
Compressor Cabinet Stabilized-Temperature Coolant Supply
ID: CA-TS-MEC-ICD-0054
Last Modified: 2/17/2017
Specification: The Telescope shall supply TBD coolant to the compressor cabinet central interface point
with the following characteristics:
Discussion: This provides coolant for stabilizing the temperature of the compressors and oil separators
Description
Value
Unit
Name
12 +/- 2
(TBR)
degC
CompCabFixedCoola
nt_Supply_Temp_Ma
xOp
Coolant Maximum Operating Pressure
80
psi
CompCabFixedCoola
nt_Supply_Pressure_
MaxOp
Coolant Maximum Design Pressure (maximum allowable pressure)
150
psi
CompCabFixedCoola
nt_Supply_Pressure_
Coolant Temperature
The contents of this document are subject to configuration control and may not be changed, altered, or their provisions
waived without prior approval.
13
Description
Value
Unit
Name
MaxDesign
Coolant Minimum Flow Rate
15 (TBR)
Minimum pressure drop across the compressor cabinet circuits from 15 (TBR)
supply to return of at least
CompCabFixedMin_TelDesign_PressureDrop at the
CompCabFixedCoolant_FlowRate_Min
4.2.2
gpm
CompCabFixedCoola
nt_FlowRate_Min
psi
CompCabFixedMin_T
elDesign_PressureDr
op
Compressor Cabinet Stabilized-Temperature Coolant Return
ID: CA-TS-MEC-ICD-0055
Last Modified: 2/17/2017
Specification: The camera shall not reject more than 24 kW into the coolant stream.
4.2.3
Compressor Cabinet Stabilized-Temperature Coolant Pressure Drop
ID: CA-TS-MEC-ICD-0056
Last Modified: 2/17/2017
Specification: The maximum pressure drop across the camera from supply to return lines at the
minimum flow rate shall be no more than CompCabFixedCoolant_Supply_Pressure_MaxDesign.
Discussion: The camera must design its flow circuits to cap the maximum pressure drop at minimum
flow rates.
4.2.4
Compressor Cabinet Floating-Temperature Coolant Supply
ID: CA-TS-MEC-ICD-0057
Last Modified: 2/17/2017
Specification: The Telescope shall supply TBD coolant to the compressor cabinet central interface point
with the following characteristics:
Discussion: This provides coolant for controlling the temperature of the refrigerant lines running up to
the camera at the top end.
The contents of this document are subject to configuration control and may not be changed, altered, or their provisions
waived without prior approval.
14
Description
Value
Unit
Name
Coolant Maximum Operating Pressure
80
psi
CompCabFloatingCoo
lant_Supply_Pressure
_MaxOp
Coolant Maximum Design Pressure (maximum allowable pressure)
150
psi
CompCabFloatingCoo
lant_Supply_Pressure
_MaxDesign
Coolant Minimum Supply Temperature
-10
Celsius
CompCabFloatingCoo
lant_Supply_Temp_
Min
6.0 +/0.5
Celsius
CompCabFloatingCoo
lant_Supply_Temp_B
elowAmbient
15 (TBR)
gpm
CompCabFloatingCoo
lant_FlowRate_Min
psi
CompCabFloatingMin
_TelDesign_Pressure
Drop
Coolant Supply Temp Below Ambient
Coolant Minimum Flow Rate
Minimum pressure drop across the compressor cabinet circuits from 15 (TBR)
supply to return of at least
CompCabFloatingMin_TelDesign_PressureDrop at the
CompCabFloatingCoolant_FlowRate_Min
4.2.5
Compressor Cabinet Floating-Temperature Coolant Return
ID: CA-TS-MEC-ICD-0058
Last Modified:2/17/2017
Specification: The camera shall not reject more than TBD kW into the coolant stream.
Discussion: This is the maximum heat that can be removed from the refrigerant supply lines as they exit
the cabinets.
4.2.6
Compressor Cabinet Floating-Temp Coolant Pressure Drop
ID: CA-TS-MEC-ICD-0059
Last Modified: 2/17/2017
The contents of this document are subject to configuration control and may not be changed, altered, or their provisions
waived without prior approval.
15
Specification: The maximum pressure drop across the camera from supply to return lines at the
minimum flow rate shall be no more than CompCabFloatingCoolant_Supply_Pressure_MaxDesign.
Discussion: The camera must design its flow circuits to cap the maximum pressure drop at minimum
flow rates.
4.2.7
Compressor Cabinet Coolant Line Fittings
ID: CA-TS-MEC-ICD-0060
Last Modified: 2/17/2017
Specification: The telescope shall terminate cooling lines at the compressor cabinet central interface
point with fittings as described in LSE-164.
Discussion: This provides the interface fittings to the camera-supplied manifolds, headers, and lines
running to/from the individual compressor chasses.
4.3
Compressor Cabinet Power
4.3.1
Compressor Cabinet Supplied Power
ID: CA-TS-MEC-ICD-0061
Last Modified: 2/17/2017
Specification: The Telescope shall provide at least 24 kW dedicated power to the compressor cabinets,
with power disconnects and breaker panel located at the compressor cabinet central interface point.
Power shall be supplied through a breaker panel, with at least 9x 10-amp 220 VAC 50 Hz circuits (TBR).
Discussion: This provides up to 1.5 kW peak load per circuit for the 8 refrigeration compressor units
plus an additional circuit for control and communications electronics. The power shall be UPS-protected.
4.3.2
Compressor Cabinet Power
ID: CA-TS-MEC-ICD-0062
Last Modified: 2/17/2017
Specification: TBD
The contents of this document are subject to configuration control and may not be changed, altered, or their provisions
waived without prior approval.
16
4.4
Compressor Cabinet Access Platform Utilities
4.4.1
Power Outlets
ID: CA-TS-MEC-ICD-0063
Last Modified: 2/17/2017
Specification: The Telescope shall provide 2 x 20-amp 220 VAC 50 Hz circuits (TBR), each feeding a quad outlet
box located within 3 meters of the compressor cabinets.
Discussion: This can be located at the central interface point or another location, suitably close to the
compressor cabinets.
4.4.2
Network Connectivity
ID: CA-TS-MEC-ICD-0064
Last Modified: 2/17/2017
Specification: The Telescope shall provide wired internet access to the summit network available within 2
meters of the compressor cabinets.
Discussion: This can be located at the central interface point or another location, suitably close to the
compressor cabinets.
4.4.3
Interlocks
ID: CA-TS-MEC-ICD-0065
Last Modified: 2/17/2017
Specification: The Telescope shall provide emergency off safety interlocks on the access platform within
4 meters of the compressor cabinets. These shall directly cut power to the telescope azimuth drive,
bypassing the telescope control system software.
Discussion: This is connected to the global emergency interlock system, which cuts power to the drive
system independent of the control system.
4.5 Compressor Cabinet
ID: CA-TS-MEC-ICD-0066
Last Modified: 2/17/2017
Specification: TBD
The contents of this document are subject to configuration control and may not be changed, altered, or their provisions
waived without prior approval.
17