Overview of Tracker Interlocks

Overview of Tracker Interlocks

• Designed to protect tracker equipment, in particular the VLPC cassettes, from damage due to failure in part of the tracker control system

• John Webb from DL electrical engineering group has taken the basic hardwired “cosmic ray” interlocks and developed a more comprehensive system that is now based around standard I/O modules, VME control and EPICS software

• The system is also expanded for use with the spectrometer (not shown here)

Existing connections between FNAL tracker rack and cryostats

• These connections are for controlling suitable operating conditions.

New connections between Interlocks VME crate and tracker equipment

• These connections are for monitoring and safety shutdown control

Motorola MVME 5500 single board computer

2&4 slot VME carrier boards equipped with various IP (Industry Pack) I/O modules

Motorola MVME 5500 single board computer

8401 8Ch ADC

2&4 slot VME carrier boards equipped with various IP (Industry Pack) I/O modules

Motorola MVME 5500 single board computer Terminal board

I/O connections between IP modules and tracker equipment

Connected Equipment for Interlocks

• RS232 modules connect with:-• Oxford temperature controllers• MKS Vacuum gauge• Wiener cryostat PSU's?

• ADC (&DAC) modules connect with:-• Cryo compressor external connectors• Cryo lid temperature control boxes• Cryostat insulation vacuum control

connector• Vesda smoke detector• Tracker rack smoke alarm

Interlocks Programming

• EPICS control/interlocks software to be written by Adrian Oates at DL

• GUI will run on PC in MLCR• AlarmAction logic mostly agreed upon

although this needs to be confirmed• Flexible hardware/software architecture allows

for easier development in the future• Additional non-resetting mains power breakers

will be used on equipment to avoid IC QA rig situation

Vesda Smoke Detector

• Senses smoke above AFEIIt boards. Alarm signal connected into interlocks system.

• Presently have one Vesda smoke detector covering 2 cryo’s. Need to purchase another and investigate if we need greater airflow rate due to length of pipework.

• Plan to ask Fire Suppression Ltd to validate design and installation in the hall. They will also provide short training course with the monitoring software.

Summary

• Hardware design and drawings are nearing completion

• Assembly of electronics rack likely to start at DL next month

• Programming to start as soon as above is available• Some detail of action logic to be confirmed• Need to provide mains breakers in the hall• Need to validate smoke detection system• John Webb’s alarms-actions list follows. It was last

discussed in August 08 and it needs some amending. I don’t suggest you think about it now unless you are in front of schedule!

Alarm/Trip Action/Interlock Control Room

Cryo Smoke Alarm (Vesda) Power off all electronics Alarm Indication

Cryostat Lid Temperature High Power off all electronics Alarm Indication

Cryostat Lid Temperature Low ? Alarm Indication

Cryostat Lid Moisture Detected ? Alarm Indication

Cassette Space Pressure Low (Helium) Power off Magnets Alarm Indication

Cryostat Insulating Vacuum Fault ? Alarm Indication

Tracker Rack Smoke Detector ? Alarm IndicationCompressor Power Fault Power off Compressor & Cryostats Alarm

IndicationCompressor Water Cooling Trip Power off Compressor & Cryostats Alarm

Indication

ALARM & ACTION REQUIREMENTS