Transcript Presentation

DCS aspects of TDAQ racks in USA15 and SDX1
Y. Ermoline et al.
ATLAS Week, CERN, 15 February 2005
SDX1 – rack monitoring by DCS (slide from Frascati meeting)
 SDX1 TDAQ computing room environment monitored by:

CERN infrastructure services (electricity, C&V, safety) and
 ATLAS central DCS (room temperature, etc)
 Two complementary paths to monitor TDAQ rack parameters

by available DCS tools (sensors, ELMB, etc.)
 by PC itself (e.g. – lm_sensors) or farm management tools (e.g. – IPMI)
 DCS sensors:

3 air temperature sensors (Pt1000) inside the rack (in front of fans)
 May be also used as sensors for fan operation monitoring if calibrated

1 humidity sensor to monitor the dew point inside the rack
 one 64-ch ELMB may serve 16 racks, 6-7 ELMB’s in total, 1 CANbus
 sensor wires between sensors and ELMB run up to 30 m
 CANbus branch up to 150 m

extra options (need more ELMB’s and interfaces to ELMB):
 fan rotation and condensed water sensors by CIAT (~400 euros/rack)
 Smoke detectors inside the rack to power-off an individual rack

same as Detector Safety System (DSS) smoke detectors
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TDAQ racks monitoring by DCS (1)
 What can be monitored by DCS inside the racks:

Air temperature
 3 air temperature sensors (NTC 10k), each sensor requires 1 ADC channel
and permit measurements from 5°C to >100°C

Relative humidity
 1 humidity sensor (HIH 3610) to monitor the dew point inside the rack,
requires 1 ADC channel

Inlet water temperature
 1 temperature sensors (NTC 10k) located on the inlet cooling water pipe,
requires 1 ADC channel

Cooler’s fan operation
 3 fan rotation Hall sensors from CIAT (binary and pulse output version
available), each sensor requires either 1 bit of digital input port or 1 ADC
channel – under discussion
 In total - 8 ADC channels per rack

The ADC channel may be also used to readout a binary signal
 64 ADC channels per ELMB – 1 ELMB per 8 racks
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TDAQ racks monitoring by DCS (2)
 What is NOT monitored by DCS inside the racks:

Status of the rear door (open/closed)
 Not considered as a really useful

Water leak/condensation inside the cooler
 Expensive (~200 euros/rack from CIAT)

Smoke detection inside the rack
 Doesn’t work with horizontal air flow
 What is monitored/controlled by other systems:

Status and switching on and off electrical circuit breakers in the rack
 By TS/EL – under discussion, depends on power distribution implementation

Water temperature in the cooling system
 By cooling system and general DCS

Smoke detection by CSAM
 CERN safety system
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ATLS DCS tools for sensors readout
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
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
The SCADA system (PVSS II) with OPC client / server
The PC (Local Control Station) with Kvaser PCIcan-Q (4 ports)
CAN power crate (16 branches of 32 ELMBs) and CANbus cable
The ELMB, motherboards and sensor adapters
ELMB
Kvaser
CAN power crate
Motherboard
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ELMB readout chain (H. Burckhart)
Subdetector Control Station
DCS Rack
PVSS-II + OPC client
LAN
Kvaser
CAN/PCI
Some (yet) missed bits:
CAN Power
Crate
Local Control Station
 Thick to thin CANbus cable adapter
 ELMB daisy-chain adapter for CANbus
connector (T-adapter or Y-splitter)
PVSS-II + OPC Server
CANbus + Power (<100m)
0x3F
0x3E
0x32
max. 32 ELMBs
TDAQ Racks
sensors
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0x31
0x30
ELMB
Motherboard
Possible implementation
 Minimal configuration - 1 ELMB per 8 racks

3 ELMBs per USA15, 13 ELMBs per SDX1
 1 CANbus branch is sufficient in USA15 and SDX1
 Maximal configuration - 1 ELMB per rack

~20 ELMBs per USA15, ~100 ELMBs per SDX1
 1 CANbus branch is sufficient for USA15
 4 CANbus branches is sufficient for SDX1
Sensors location
on the rear door
Temperature
Rotation
Humidity
All sensor signals
and power lines
routed to connector
to simplify assembly
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Present status and further steps
 Test setup is ready for exercises:

PC/NiceXP + Kvaser PCIcan-Q + Cable for PCIcan-Q
 ELMB + motherboard + power supply (CANbus + digital/analog)
 Kvaser driver + OPC server installed
 Note under preparation – first draft discussed with H.Burckhart
 Sensors and wires choice and adapter design (humidity, rotation)
 CAN cable (<100 m for SDX1) choice and CANbus adapters design

Voltage drop in power lines
 Mechanical arrangement in the rack (ELMB and sensors)
 Final configuration:

One LCS and CAN power crate seems sufficient
 Decide on number of CANbus branches and ELMBs
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