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GLAST LAT Project
Env Test Planning,15 March 2005
LAT Thermal Vac
EGSE Cabling
LAT System Engineering
1
GLAST LAT Project
Env Test Planning,15 March 2005
TVAC Electrical Layout Drawing
TV Chamber Wall
1-1
1-2
1-3
1-4
1-5
1-6
1-7
2-1
2-2
2-3
2-4
2-5
2-6
2-7
EGSE CABLING TBD
UNTIL INTERNAL TVAC
CABLING IS DETERMINED
3-1
3-2
3-3
3-4
3-5
3-6
3-7
4-1
4-2
4-3
4-4
4-5
4-6
4-7
5-1
5-2
5-3
5-4
5-5
5-6
5-7
6-1
6-2
6-3
6-4
6-5
6-6
6-7
Pigtails
Prim_P2
Red_P2
Prim_P3
Red_P3
Prim_P1
Red_P1
Prim_A_P5
Connector Savers
JL-119
1553
Coupler
JL-232
JL-233
1553
Coupler
JL-234
JL-235
JL-120
Prim_B_P5
Prim_A_P12
JL-122
Prim_P6
Prim_P7
JL-1
Prim_P9
Prim_P10
JL-2
Red_A_P5
Red_B_P5
Prim_B_P12
Red_P6
Red_P7
Red_P9
Red_P10
Prim_A_P4
Prim_B_P4
GBM-J1
Prim_P8
Prim_P11
Red_P11
LAT
JL-121
JL-124
JL-125
SIIS Harness
JL-138
JL-145
JL-133
JL-136
JL-127
JL-129
JL-140
JL-142
Red_A_P4
Red_B_P4
Red_P8
JL-146
JL-149
JL-152
JL-131
JL-238
JL-123
JL-144
JL-239
JL-69 (Test Port)
JL-39 (Test Port)
JL-264 (Flyaway Thermistors)
7-1
7-2
7-3
7-4
7-5
7-6
7-7
8-1
8-2
8-3
8-4
8-5
8-6
8-7
LAT System Engineering
JL-266 (Flyaway Thermistors)
ACD Flyaway Thermistors
+ 1 LAT Thermistor
ACD Removable Thermistors
Flyaway TC’s
Removable TC’s
Mix of Removable and
MGSE TC’s
MGSE TC’s
2
GLAST LAT Project
Env Test Planning,15 March 2005
SIIS Harness Wire Count (1/2)
PP # - Conn #
Conn #
Description
1-1
Prim_P2
JL-1, 119, 127
32
1-2
Red_P2
JL-2, 120, 129
32
1-3
Prim_P3
JL-1, 119, 140
32
1-4
Red_P3
JL-2, 120, 142
32
1-5
Prim_P1
JL-143, 146
16
1-6
Red_P1
JL-136, 149
16
2-1
Prim_A_P5
JL-121
14
4-1
Prim_A_P4
JL-125
26
3-1
Red_A_P5
JL-122
14
5-1
Red_A_P4
JL-138
26
2-2
Prim_B_P5
JL-121
14
4-2
Prim_B_P4
JL-124
26
3-2
Red_B_P5
JL-122
14
5-2
Red_B_P4
JL-145
26
4-3
GBM_J1
JL-124, 125, 138, 145
16
LAT System Engineering
Power (wires)
LVDS (wires)
Analog(wires)
1553
3
GLAST LAT Project
Env Test Planning,15 March 2005
SIIS Harness Wire Count (2/2)
PP # - Conn #
Conn #
Description
2-3???
Prim_A_P12
JL-232, 233
1
3-3???
Prim_B_P12
JL-234, 235
1
2-4
Prim_P6
JL-1, 2, 152
32
3-4
Red_P6
JL-1, 2, 153
32
2-5
Prim_P7
JL-121, 123, 124
32
3-5
Red_P7
JL-122, 123, 138
32
4-4
Prim_P8
JL-238, 124, 125, 127, 129
30
5-3
Red_P8
JL-238, 138, 145, 127, 129
30
2-6
Prim_P9
JL-131, 140
30
3-6
Red_P9
JL-131, 141
30
2-7
Prim_P10
JL-142, 144
30
3-7
Red_P10
JL-142, 145
30
4-5
Prim_P11
JL-239, 152
30
4-6
Red_P11
JL-239, 152
30
TOTAL
LAT System Engineering
Power (wires)
160
LVDS (wires)
176
Analog(wires)
368
1553
2
4
GLAST LAT Project
Env Test Planning,15 March 2005
Test Signal Wire Count
PP # - Conn #
Conn #
LVDS (wires)
Analog(wires)
Test Port
5-4, 5-5, 5-6
JL-69
80
5-7
JL-39
34
Total
114
Thermistors
6-1, 6-2, 6-3
Flyaway
74
6-4
Removable
8
Total
82
GSE Heater
TBD
TC's (Sensor Count)
TBD
# of Sensors
6-5, 6-6, 6-7
Flyaway
54
7-1thru 7-6, 7-7
Removable
110
7-7, 8-1, 8-2, 8-3
MGSE
61
Total Sensors
225
LAT System Engineering
5
GLAST LAT Project
Env Test Planning,15 March 2005
Total Counts
Power (wires)
TOTALS
160 (minus GSE
Heaters)
LAT System Engineering
LVDS (wires)
290
Analog(wires)
450
1553
4
TC's
(Sensors)
225
6
GLAST LAT Project
Env Test Planning,15 March 2005
Near Term Issues/Work
•
•
•
Need to order long lead items such as TVac connectors
– GSE Heaters
• Heater requirements are quickly being developed
– 1553 Port plate configuration
SIIS harness will not reach all the necessary port plates
– Investigate modifying harness by “breaking out” cables further
from main harness.
• Not obvious from drawings if this is possible.
• When SIIS harness is delivered (March 21),an evaluation can
be made.
– Other possibility is to build extension cables.
• Not desirable since it adds more interfaces.
– Harness routing
• Bend radius
• Strain relief
Not using SIIS Cable implementation of 1553.
– Consolidates prime and redundant via 1553 couplers
– VSC needs all four 1553 penetrations through port plates
LAT System Engineering
7
GLAST LAT Project
Env Test Planning,15 March 2005
Near Term Issues/Work
• Facility Drawing
– Port plate location relative to LAT
• Used to determine cable lengths inside chamber
– Locate EGSE outside chamber
• Used to determine cable lengths outside chamber
• Facility power capability for EGSE
• Thermocouples
• How the thermocouples will be grouped on the LAT end
is TBD.
• Wirelist
– Work is just starting
• Minor issue with flyaway thermistor count
– One to many sensors to fit all on 2 connectors
– Need to balance need for thermistor and cable complexity
LAT System Engineering
8