[BLAST_SHIFTS] ABS Alarms

From: Nikolas C Meitanis (nikolas@MIT.EDU)
Date: Sat Jul 05 2003 - 22:54:17 EDT


A version of the Blast alarm handler that includes only ABS channels is
now functional on dblast10 (the one next to the printer ). It will require
attention once it starts beeping, do not ignore it.
To run correctly, Polarized gas must be specified and either D2 or H2
chosen. always check that what you set on the abs screens agrees with the
ABSinfo screen and the ABS bits on dblast14.
The Alarm can be triggered by the following:
1. If any of the valves V10-V16 closes during operation.
In this case you should probably try to figure out why, try to see if they
can be opened again and see if the alarm disappears. When in doubt call an
expert.
2. If the target holding field changes from its setpoints
In this case talk to CCR first.
3.Nozzle and Cell Temperatures
If these change it is probably an indication that something has gone
wrong. Check gas flow, plasma RF and if there is still plasma. This will
probably require an engineer's assistance...
4.RF reflected
This is likely to go over its upper bound as plasma may get slightly
detuned over time. Try to use the ATK controller screen on dblast10 to
bring it back. If plasma has been lost and you dont know how to get it
back, call an expert.
5.Rough1 and rough2.
Here you probably need an engineer.
6.C1 pgfs
If this goes under its limit you are not flowing the amount of gas you
should, for whatever reason (MFC tripped, valves tripped, bottles ran out
etc). If it goes over the bounds the nozzle is probably getting clogged.
call an expert before too late...
7.Ligit, BRP and Compression tube
These will probably be changing due to transitions and beam tunes etc.
Complete operation has yet to be established so these will be going off
frequently.
8. Nozzle, skimmer, 6poletop, 6polebottom.
Here you most likely need an expert.

feel free to comment.
n



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