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Entry  Fri Nov 9 22:24:22 2018, Jon, Omnistructure, , Wiring of Vacuum Acromag Chassis Complete IMG_2987.jpgIMG_2985.jpgIMG_2986.jpg
    Reply  Fri Nov 16 15:09:31 2018, Steve, Configuration, VAC, not venting cryo and ion pumps 
Message ID: 14301     Entry time: Fri Nov 16 15:09:31 2018     In reply to: 14287
Author: Steve 
Type: Configuration 
Category: VAC 
Subject: not venting cryo and ion pumps 

Notes on the ion pumps and cryo pump:

  • Our 4 ion pumps were closed off for a lomg time. I estmated their pressure to be around ~1 Torr. After talking with Koji we decided not to vent them.

  • It'd be still useful to wire their position sensors. But make sure we do not actuate the valves. 

  • The cryo pump was regenerated to 1e-4 Torr about 2 years ago. It's pressure can be ~ 2 Torr with charcoal powder. It is a dirty system at room temperature.

  • Do not actuate VC1 and VC2, and keep its manual valve closed.

  • IF someone feels we should vent them for some reason, let us know here in the elog before Monday morning.

 

Quote:

Wiring of the power, Ethernet, and indicator lights for the vacuum Acromag chassis is complete. Even though this crate will only use +24V DC, I wired the +/-15V connector and indicator lights as well to conform to the LIGO standard. There was no wiring diagram available, so I had to reverse-engineer the wiring from the partially complete c1susaux crate. Attached is a diagram for future use. The crate is ready to begin software developing on Monday. 

 

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