chiller control system specification meeting 24.11.2010 lukasz zwalinski – ph/dt

Chiller control system

Specification meeting 24.11.2010

Lukasz Zwalinski – PH/DT

• Automatic call of operators in case of failure or alarm

• Failure diagnostic tools

• User friendly man-to-machine interface

• Long term data storage

• Full automatic remote control through the CERN TN

• Schneider PLC and IO

• Maintain the PLC by CERN team

Project requirements

L.Zwalinski – PH/DT/PO 24.11.2010

General requirements:

• Ensure stable long, safe and automatic operation without presence of the operators

• Provide safe shut-down and automatic restart procedures in case of failure

• Automatic adjustment of the cooling power to the actual load (between 20%-100%)

• Enable possibility of fast changes on control system by CERN people

• Control system conforming CERN standards

To fulfill this requirements CERN will provide:

CERN’s standard for PLC and SCADA

UNICOS framework(UNified Industrial COntrol System)

SCADA system with long term logging (PVSS)

Split of the responsibilities


• Control & electrical & pneumatic cabinets cabled up to the terminal blocks

• All sensors and actuators respecting CERN standards

• Documents to be filled by supplier: 1. General Control System Requirement

2. Functional Analysis3. Process & Instrumentation information4. Instrument List

• Schneider 7.5” or equivalent touch panel

Supplier• Schneider PLC and IO cards• PLC and PVSS software• Terminal blocks (to be installed by supplier)• Templates for the documents to be delivered

by the supplier• Integration in CERN control systems,

connection to DCS

CERN

Terminal blockLimit of the supplier

Logic Generator

Instance Generator

Softwareproduction

Collaboration of EN/CV/DC

PH/DTEN/ICE

CERN limit


Electrical control and pneumatic cabinets

For maintenance reason it shall be possible to disconnect independently each one of the chillers from the electrical supply during nominal operation without interfering with the normal operation.

Electrical cabinet

50% spare space for additional equipment

Control and pneumatic cabinet

30% spare channels cabled to terminal block

50% spare space for additional equipment

• One electrical cabinet for each chiller and one for the brain circuit

• Electrical schematics have to be prepared in:

Microsoft Visio, Tracelec or AUTOCAD

• All equipment, cables and wires in the cabinets shall be labeled

• All the equipment and the instrumentation shall be labeled with the tag code provided by CERN

• Justification of sizing cables and protection devices have to be prepared in TR-Ciel software

• CERN provide the color code for the internal wiring

• Emergency stop button has to be present on each cabinet withfeedback signal to the PLC

• Feedback signals form each CB and TS should be connected to the PLC

• Supplier has to ensure that in case of PLC failure the basic protection against damage in particular compressors must be provided by the hard wired interlocks. The status of the hard wired interlock has to be available in the PLC.

Max 2m from floor level


Summary

• All control specific requirements are based on the information from the EN/CV department and

TE/CRG/CE section which has an experience in preparation and specification of the

requirements for the control system of cooling or cryogenics stations produced by external

company.

(Like LHC Cold-Box Refrigeration Units)

• To prepare UNICOS based Chiller Control System there will be a collaboration of EN/CV/DC,

PH/DT and EN/ICE.

• Detail control, electrical and instrumentation requirements can be found in

Annex 5: Control and Regulation

Annex 6: Instrumentation

Annex 7: Electricity