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DCS aspects of TDAQ racks in USA15 and SDX1

This presentation discusses the monitoring of TDAQ racks in USA15 and SDX1 using the Distributed Control System (DCS). It explores the sensors and tools used for monitoring various parameters inside the racks and highlights the implementation options.

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DCS aspects of TDAQ racks in USA15 and SDX1

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  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, 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

  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 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

  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 • 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

  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 (<100m) 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

  8. 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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