Monday, July 31, 2017, 15:24

Turned on BV and TP this afternoon.

Started ramping down, ~1min after turned on both tripped off.

Vacuum box turned red.

IGP1 appears yellow but still registering a vacuum.

TP interlocks: requires IEVAP2:IGP1 < 500mTorr but IGP1 = 6mTorr when tripped off.

Should have been satisfied and therefore not tripped but IGP1 not communicating?

Nothing wrong with ion gauge in person, vacuum good on direct read out.

When attempting 'Global Reset', nothing would reset - vacuum box remained red etc.

See screenshot attached of errors.

 Tuesday, August 01, 2017, 15:31

Had kept BP, PV and RV overnight.

This morning vacuum fine, everything had reset except "IEVAP2:TP on" under device notes for IEVAP2:TP remained red.

Turned on BV and TP, once turbo pump registered on, red wording went away.

Currently pumping down - everything looks fine now.

Still unsure of reason for these errors...

 Friday, August 04, 2017, 10:55

Happened again last night at ~5:45 while evaps at ~420A - see elog i.d. 383 for photos and details.