DCS aspects of TDAQ racks in USA15 and SDX1
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DCS aspects of TDAQ racks in USA15 and SDX1 Y. Ermoline et al. ATLAS Week, CERN, 15 February 2005
description
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 - PowerPoint PPT Presentation
Transcript of DCS aspects of TDAQ racks in USA15 and SDX1
DCS aspects of TDAQ racks in USA15 and SDX1
Y. Ermoline et al.
ATLAS Week, CERN, 15 February 2005
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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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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
TDAQ racks monitoring by DCS (1)
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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
TDAQ racks monitoring by DCS (2)
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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
Motherboard
CAN power crate
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ELMB readout chain (H. Burckhart)
0x3F 0x3E 0x32 0x31 0x30
max. 32 ELMBs
CANbus + Power (<100m)
LAN
Subdetector Control StationPVSS-II + OPC client
Local Control StationPVSS-II + OPC Server
Kvaser CAN/PCI
ELMBMotherboard
CAN PowerCrate
DCS Rack
TDAQ Racks sensors
Some (yet) missed bits: Thick to thin CANbus cable adapter ELMB daisy-chain adapter for CANbus
connector (T-adapter or Y-splitter)
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Possible implementation
Sensors location on the rear door
Temperature
Rotation
Humidity
All sensor signals and power lines routed to connector to simplify assembly
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
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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
