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