DCS Workshop
André Augustinus16 June 2003
Safety
16 June 2003DCS Workshop 2André Augustinus
Safety Systems
What is Safety:• Safety of people (prevent injuries or worse)
• Safety of equipment (protect capital investment)
CERN Safety System• Covers Level3 alarms (Fire, Gas etc.)
DCS ensures integrity through:• Alarm reporting (for operator intervention) and automation• Detailed control on detector level and control of
infrastructure and services (with high granularity)• Interlocks on detector level
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Context
Control and safety systems will act directly on the equipment at the experiment site; such as:• Detectors with their related equipment
• Racks and crates
• Gas systems
• Cooling systems
• Magnets
• Power distribution
• Water distribution
General services: power, water
Experiment services:gas, cooling, magnet
Experiment: detectors, racks, crates
Technical Services provide power, water, primary gas (general services) and distribute them to the different locations (experiment services).
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Context Sensors monitor the state of the equipment:
• temperature (equipment, ambient air, water),• humidity, water leak• water-flow,• Smoke and gas,• status signals of the detectors
There are dedicated sensors for the different safety and control systems
General services: power, water
Experiment services:gas, cooling, magnet
Experiment: detectors, racks, cratesSensors Sensors Sensors
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CCS(cooling)
Control systems The various control systems are responsible for the overall
monitoring and control of the detector or services. They will take corrective action to maintain normal operation. All control systems are interconnected.
General services: power, water
Experiment services:gas, cooling, magnet
Experiment: detectors, racks, cratesSensors Sensors Sensors
monitor
control
DCSsub-system C
DCSsub-system B
DCSsub-system A
MCS(magnets)
GCS(gas)
ST/CV(water)
ST/EL(power)
Trip
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Safety system (CSS) The safety for personnel is ensured by the CERN Safety
System (CSS). It is required by law and conforms to relevant International, European, and National standards.
It has its own sensors and reacts globally,i.e. on whole buildings or caverns
General services: power, water
Experiment services:gas, cooling, magnet
Experiment: detectors, racks, cratesSensors Sensors Sensors
DCSsub-system C
DCSsub-system B
DCSsub-system ACSS
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Safety system (CSS)
General services: power, water
Experiment services:gas, cooling, magnet
Experiment: detectors, racks, cratesSensors Sensors Sensors
DCSsub-system C
DCSsub-system B
DCSsub-system ACSS
Smoke,Gas Leak
TCRFire Brigade to P2
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Local safety systems(e.g. MSS, Interlocks)
General services: power, water
Experiment services:gas, cooling, magnet
Experiment: detectors, racks, cratesSensors Sensors Sensors
DCSsub-system C
DCSsub-system B
DCSsub-system A
Local safety systems preserve the integrity of well defined systems• The Magnet Safety System protects the magnets• Interlocks protect detectors
MSS
Waterfail
Ramp downmagnet
Gasfail
Ramp downHigh Voltage
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Is that all ?
General services: power, water
Experiment services:gas, cooling, magnet
Experiment: detectors, racks, cratesSensors Sensors Sensors
DCSsub-system C
DCSsub-system B
DCSsub-system A
Does this cover all events? What happens if a control room gets hot?
• Only action if individual items overheat (or burn…) What happens if there is a water leak in the racks?
• Only action if electronics get wet and short-circuit… What happens if T goes up in detector?
• Only action if one of detectors see it
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Detector Safety System
General services: power, water
Experiment services:gas, cooling, magnet
Experiment: detectors, racks, cratesSensors Sensors Sensors
DCSsub-system C
DCSsub-system B
DCSsub-system A
DSS covers some of the functionality that was covered by GSS in LEP times (and is not covered by CSS and DCS)
Name might be misleading, DSS covers more than only detector safety• Think of it as experimental area surveillance system
Water Leak
DSS
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Experiment DCS
Detector Safety System
General services: power, water
Experiment services:gas, cooling, magnet
Experiment: detectors, racks, cratesSensors Sensors Sensors
DCSsub-system C
DCSsub-system B
DCSsub-system A
DSS is embedded in the experiment DCS system
DSS
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DSS project
Four LHC experiments defined requirements JCOP project started May 2002 Prototype has been build by DSS team Review has taken place earlier this month Installation for CMS and LHCb this year Installation for ALICE next year
• Will have to define requirements of first installation by the end of this summer
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DSS Implementation A redundant PLC
solution (Siemens) has been chosen for the ‘front-end’(similar to the new safety system of the Mont Blanc tunnel)
CPUs are comfortably separated to minimize danger of accidental damage
Cavern
Surface
Shaft
Optical Link
Interconnection with optical link
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DSS Implementation
Redundant cables running throughtwo cable paths.Spares for all cables are foreseen.
Cavern
Surface
Shaft
Optical Link
PROFIbusDSS COM
CERN LAN
Internal DSS Network Connection to outside
world through “gateway”
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DSU Layout
Patch Panel Terminals to connect sensors / actuators
Table / Drawer
Control Room Panel, Gyro & Siren (not part of a DSU)
External Crate with dedicated Monitoring Module2nd External Crate possible
Ethernet Switch for DSS COM (in DSUs with CPU crate)
CPU crate (in two DSUs)
Redundant 24V Power Supply & a Distribution ModuleFront-End Display
OPC Server / Gateway (in one DSU)
Uninterruptible Power Supply (UPS)
52 units standard LEP rack (here: 56U)
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DSS implementation
The ‘back-end’ (configuration and user panels) is based on PVSS
Maintenance and support will be done by a central team
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DSS
Will cover mainly water temperature and ambient temperature measurements; some water leak detection
A limited amount of detector inputs and outputs are foreseen• Detector needs will be studied case by case
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Example
To illustrate the fact that the DCS, DSS and CSS systems are complimentary• Use a counting room as example
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T
Tambient
TRackTswitchTambient only for monitor
If TRack too high act on equipment in the rack
If Tswitcht too high stop power to rack (hardwired)
DCS
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T
Twater
T1
T2
T3
T4
Vlvin
Vlvout
Water Leak
Power
closevalves stop
powerIf 2 out of (T1, T2, T3, T4) too high stop power
If Twater too high stop power
If valves closed stop power
If Leak stop power (also to CR below!) and close valves
If no Power Signal deta and/or detb and/or detc
If Det1 or Det2 Signal deta and/or detb and/or detc
Det1Det2
deta
detb
detc
DSS
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T
Smoke
In case of smoke stop power (to all counting rooms)
CSS
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Summary
There is not much for you to do (for once…)• The activity is concentrated in the central team,
with the ‘pit operation’ team and Glimos• But, let us know if you think of a parameter that
could be input to the DSS and act on your detector or equipment