DCS aspects of TDAQ racks in USA15 and SDX1

1
DCS aspects of TDAQ racks in USA15 and SDX1

• Y. Ermoline et al.
• ATLAS Week, CERN, 15 February 2005

2
SDX1 rack monitoring by DCS (slide from
Frascati meeting)

• SDX1 TDAQ computing room environment monitored
  by
• CERN infrastructure services (electricity, CV,
  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 ELMBs 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 ELMBs 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

3
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 5C to gt100C
• 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
• Coolers 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

4
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
• Doesnt 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

5
ATLS DCS tools for sensors readout

• 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
6
ELMB readout chain (H. Burckhart)
Subdetector Control Station PVSS-II OPC client
DCS Rack
LAN
Kvaser CAN/PCI
CAN Power Crate

• Some (yet) missed bits
• Thick to thin CANbus cable adapter
• ELMB daisy-chain adapter for CANbus connector
  (T-adapter or Y-splitter)

Local Control Station PVSS-II OPC Server

CANbus Power (lt100m)
ELMB Motherboard
0x3F
0x3E
0x32
0x31
0x30
max. 32 ELMBs
TDAQ Racks
sensors
7
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 (lt100 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