1. CSC DSS Status Report by Fred B.
19-April-05
DSS
DSS
Detector Safety System
Safety of Hardware NOT personnel
Hard wired reaction – computer only monitors
Turns OFF hardware when
Level 3 alarm > fire
Crash buttons in CSM Control Room
Sensors in each rack alarm
Smoke
Temperature > 40C
Tested CMS DSS Monday 26/10/2009
Pushed CRASH buttons in CMSCR
Observed that the breakers for the CSC OPFC modules were tripped off by DSS
Observed that ‘most’ turbines in UXC turned OFF
Improvements to be made and a follow up test conducted - date TBD but ~ 1 wk
Need to define our criteria for test
12-Nov-19
CSC DSS Status Report by Fred B.

2. CSC DSS Status Report by Fred B.
19-April-05
DSS Reviews
Proposed Reactions >>
General reaction for a level 3 alarm
Immediately notify CSC-DCS vial DIP
CSC-DCS shuts down all HV and LV (top DCS button to OFF)
After 15 second delay
Turn off OPFC breakers in S4
Turn off HV
Trip rack for ME1/1 CAEN
Trip 2 racks for UF HV system
Reaction for DSS alarm within a rack
UXC
Trip off pre-determined OPFC breakers
Trip off HV rack (ME1/1 or UF)
S4 Same as level 3 for S4F04
S1 standard CMS reaction for HV, FED and TF racks S2
Level 3 shutdown
standard CMS reaction for computer racks
Surface (local DAQ) – standard CMS reaction
CMS has had a series of reviews of DSS
People in attendance have been Armando, Dick, Petr and myself as CSC representative
Participants learned a great deal about what the DSS system is and does and what it should do. (and what it does not do)
CSC had a specification for DSS with reguards to CSC – but now needs to update this specification
What alarms should DSS in our racks respond to
What actions should DSS take for each possible alarm
What time delay should be set for each action
12-Nov-19
CSC DSS Status Report by Fred B.

3. CSC DSS Status Report by Fred B.
19-April-05
Other Points
CSC-DCS and the DSS system are intertwined
Want CSC-DCS to know a DSS action will take place and make a ‘softer’ intervention
Immediate DIP message and 15 sec time delay on DSS
DCS monitored temperature sensors could turn off hardware before the DSS trip level is reached.
45 min expected to turn on after DSS total shut down.  Program from cDCS should now work.  Silvest by hand took 2.5 hours pushing touch screen.
The breakers for the OPFCs cannot be turned on by any other than an electrician - this is a legal requirement.  So currently only one person, Silvest, can turn them back on.  Resetting requires opening the armoirs, making internal measurements. 
DSS in each rack has
Smoke detector (not optimal)
Temperature sensor (not optimal)
Each rack DSS has 4 unused inputs
We have suggested that thermal sensors be added to each rack and placed within the rack volume
between crates
On manifolds
We could suggest that water flow information could also be added here
For each alarm within the DSS system
Many actions can be defined
Each action can touch any other DSS component
Each action can be time delayed
Each action can be published to DIP so other systems (DCS) can monitor and react
12-Nov-19
CSC DSS Status Report by Fred B.