Post on 24-Dec-2015
transcript
DSS Advisory Board 06.10.2003Christoph Schäfer
Rack Safety System
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Introduction
The Rack Safety System is a proposal of CMSand was discussed during the September CMS
week in detail.
It does not replace the Rack Monitoring and Control System
(RMCS),but it’s a complement and collects all directly safety relevant signals
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Philosophy
Detector Level: DCS & DSSRack Level: RCMS & RSS
Split purely safety relevant informationfrom monitoring & contol information
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reads out the ELMB’s two temperature sensorsspeed of tangential fans humidity sensor, etc.
cuts power to rack(s) via software
allows for trending and preventive maintenance
Rack Monitoring & Control System
The RMCS could be seamlessly integrated into the DCS
Hardwired safety signals could be integrated into a Rack Safety System (RSS)
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Smoke Sensors (2 per rack, logical AND)installed by ST/MA (Centrale Incendie)
Thermal Switchprovide current loop
Signal from the Detector Safety System (DSS)
RSS stores the rack map
RSS Inputs
The RSS has to deal with 3 inputs/rack
and should memorize all inputs
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cuts power to rackby sending first a signal to DCS in order to shut down power gracefully and after adjustable delay hardwired cutelectronic equipment is best protected
enables power to rackstriggers fire extinguishing system
foreseen for all UXC racks from the beginning
RSS ActionsThe RSS has to trigger 2 actions/rack
Flexible logic needed
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Each rack (320) and AC/DC converter (400) is controlled by a remotely controlled relay
each relay can be opened/closed by a current loop provided by RSS
RSS and all realys are in the service cavern
ST/EL uses only RS485 to power on/off racks and AC/DC converters (granularity to be defined)
Power Cut
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CMS uses exclusively the RSS current loop to switch on/off racks and AC/DC converters
CMS has priority to keep rack or AC/DC converter off
Power Cut
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Inside a rack there is no relay but a Power Distribution Chassis (PDC)
A PDC comprises 5 manually resettable fuses:
turbine
3 crates
distribution box
Power Cut
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Number of Channels200
US racks120
UX racks400
UX ADC
smoke detection 200 120 80
thermalswitch 200 120 400
fire ext. none 120 ?
DSS 40 30 80
grand total: 2110
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All necessary functionality of RSS already incorporated in DSS
Essentially no development for RSS needed
ELMB card read out by the RMCS, no modification necessary
RSS = DSS Clone
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Power
Thermal SwitchT
TTT
DSS
RSS
DCS
E Fire Extinguisher
E E E
Smoke SensorS
Centrale Incendie
S S S S S S
DCSELMB ELMBELMBST/EL
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Fire Extinguishing
DetectionLine
RSS
N2
orFM200
Gas Line
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Rack Monitoring & Control Systemuse current ELMB cards, no modification
Rack Safety Systemuse existing DSS hardware, no developmentabout 2000 channels
Summary
This CMS proposal covers: