Evolution of the gas system control for flight

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Evolution of the gas system control for flight
WINCAN Macro
WINCAN
WINCAN Basic
WINCAN Diagnostic
WINCAN Monitor
Code and Manual available at http//www.cern.ch/s
pada/AMS/
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ISS lt-gt ground data communication software
location
WINCAN Macro state definitions
JMDC
HRDL
WINCAN Monitor check list
ISS
GROUND
WINCAN Macro State definitions, mixing)
log files
PC
WINCAN Diagnostic
WINCAN Basic user interfaces
WINCAN Monitor display
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Security checks

• Security conditions to be verified before
  operating on the system
• On valves
• Forbidden to open a valve if the last temperature
  readout is too old or if temperature is under a
  fixed threshold
• Forbidden to open a valve if a heater is on (not
  enough power)
• Before opening a valve on the tank - D vessel
  line, disable the upstream one (avoid two valves
  open at a time)
• On heaters
• No heater on if a Marotta valve is open (not
  enough power)
• Keep average dissipation (duty cycle) under a
  fixed threshold
• These conditions are automatically taken into
  account in what follows

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Defined states of the gas system/1

• To minimize the communication with space
• define states of the system the definition
  resides on the JMDC
• from ground only send command bring system in
  status x
• Examples of defined states

state Ground

• Close all VA, VB, VC, VD

manifold
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Defined states of the gas system/2
state Empty
verify temperature
ok
not ok
heaters on
verify pressure in D
not ok
ok
stop
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Defined states of the gas system/3
state Ready
verify temperature
ok
not ok
heaters on
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Defined states of the gas system/4
state Run
verify P2
ok
not ok
stop
verify temperature
ok
not ok
heaters on
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Diagnostic procedures/1
Example of a procedure to determine the status of
electromechanical components check of the
Marotta valves in the box S after a dysfunctional
behaviour of the pressure in the D vessel.
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Diagnostic procedures/2
open V1A open V2A open V3A
V1A ok V1B ? V10A ? V10B ? V2A
ok V2B ? V3A ok V3B ? V20A ? V20B ?
measure P2A
ok
stop
not ok
measure P2B
ok
P2A ko
stop
not ok
open V10A open V2A open V3A
V1A ko V1B ? V10A ok V10B ? V2A
ok V2B ? V3A ok V3B ? V20A ? V20B ?
measure P2
ok
stop
not ok
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Diagnostic procedures/3
open V20A open V20B open V2B open V3B
V1A or V10A ok V1B ? V2A or V3A ko V10B
? V2B ok V3B ok V20A ok V20B ok
measure P2
ok
stop
not ok
open V1B open V2B open V3B
(V1A V10A) or V20A or V20B ko V1B
ok V10B ? V2A ? V2B ok V3A ? V3B ok
measure P2
ok
stop
not ok
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Diagnostic procedures/4
open V10B open V2B open V3B
(V1A V10A) or V20A or V20B ko V1B
ko V10B ok V2A ? V2B ok V3A ? V3B ok
measure P2
ok
stop
not ok
open V20A open V20B open V2A open V3A
V1A V10A ko V20A V20B ok V1B or V10B
ok V2A ok V2B or V3B ko V3A ok
measure P2
ok
stop
not ok
stop
P2a, P2b ko???
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Summary

• WINCAN split in four branches
• Basic
• Monitor
• Macro
• Diagnostic
• Security conditions included
• Defined states of the system
• To do
• Continue with safety study
• More diagnostic procedures

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State Ground
Box S
Manifold
disable V1a disable V10a disable V2a disable
V3a disable V20a disable V4a disable V1b disable
V10b disable V2b disable V3b disable V20b disable
V4b
close VimA close VimB close VimC close VimD
i 1, ,5 (6) m 1, ,8
heaters off
Box C
disable V6a disable V18a disable V6b disable V18b
close V8a close V8b
heaters off
CP1 off CP2 off
HV off