Beam Interlock System SPS CIBU Connection Review

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Presentation transcript:

Beam Interlock System SPS CIBU Connection Review Christophe Martin TE/MPE

Outline:

Outline:

For the SPS, 43 CIBU in total 35 CIBU in operation before LS1 8 new CIBU installed during LS1

Outline:

CIBU User manual EDMS 636589 The reference document used to qualify a CIBU connection is the CIBU user manual 1V51

CIBU redundant signals Distinct connection OK The redundancy is applied at least at the “Output stage” of the User electronic

CIBU redundant signals Serial connection NON-CONFORM !

CIBU redundant signals Parallel connection NON-CONFORM !

CIBU Switches position Wrong switches position NON-CONFORM ! This schematic was the recommended implementation in the CIBU user manual 1V4 up to 2009 !!! Following the presentation “CIBU Connection Review” of Benjamin Todd of December 2008, this schematic has been reported as “non-conform”

User output impedance Serial resistor NON-CONFORM ! In the CIBU user manual 1V4 up to 2009 a misinterpretation can lead the users to provide a current into the CIBU. The current loop is inside the CIBU, the user has to provide a voltage !

Connection details between the User systems and the CIBU If wire “1” and “2” are not connected, the cabling is not conform (No return path for the CIBU voltage suppressor in case of over voltage)

EMC compliance interconnection The shielding must be present on the connection cable (visual control) Reminder: The interconnection cable between the User electronics and the CIBU is under the responsibility of the user!

Outline:

New CIBU Commissioning tool Main features: Checks the voltage applied on both user permit (A+, A- & B+, B-) BIS Handheld tester Checks the User Output impedance (A & B) Checks the current drawn by the CIBU (A & B) Checks the redundancy of user permit A & B (serial connections are detected) Checks the ground connection (pin 1 & 2) Automatically generates an Excel report (Bluetooth connection with a windows PC) NI CVI remote application on Windows PC

Commissioning test sequence EDMS 1400288 In order to efficiently realise the commissioning test, the owner of the system can find in this document all details related to the test sequence.

Outline:

SPS Cibu connection status As found in June After User improvement

SPS non-conformity details As found in June

SPS non-conformity details After User improvement

GND on cibu connector

not tested CIBU in the SPS Currently, the following systems have been not yet tested: Note: the test of the CIBU “ACCESS Chain 1” is foreseen on the 27/09 during the DSO tests

Outline:

Many connections in the SPS are reported as “non-conform”. What will we do with these connections ??? We needed more or less 2 months for testing 34 CIBU in the SPS - LHC => 152 CIBU - Extraction => 108 CIBU - Injection => 37 CIBU Total => 297 CIBU !!! We can assume that a lot of time will be required if we have to re-test all these CIBU

Thanks for your attention

Spare slides

Blm detail connection

Timescale 7th August 2008 No Beam In the Machine Final Commissioning Vacuum System to Beam Interlock System Vacuum Valves moved IN around IR3 Vacuum UJ33 USER_PERMIT_A stayed TRUE Vacuum UJ33 USER_PERMIT_B stayed TRUE BIC Test Mode showed ALL OK Commissioning Fail

As Tested July 08

August 08 - After Incident 46 Signals From other equipment 6 floating wires Surface IR3 100m PLC = 48V Not Enclosed 2m to Lift Motor 1m to GSM Repeater WHEN CONNECTED CIBU ALWAYS TRUE (next slides) LHC Beam Interlock System

What was the mechanism? LHC Beam Interlock System

What was the mechanism? LHC Beam Interlock System

What was the mechanism? LHC Beam Interlock System

What was the mechanism? LHC Beam Interlock System

What was the mechanism? LHC Beam Interlock System

What was the mechanism? LHC Beam Interlock System

What was the mechanism? LHC Beam Interlock System

In Summary Several events = complete Blind Failure Two Equipment systems sharing the same channel PLC Voltage against rules TVS Blocked Short-Circuit Inputs were not redundant Not re-commissioned by MI after a significant change In addition… a) Cable length against rules b) EMC would have been a show-stopper anyway!