[INSTRM-1329] Limit operation range of the instrument rotator Created: 24/Jul/21  Updated: 15/Oct/21  Resolved: 15/Oct/21

Status: Done
Project: Instrument control development
Component/s: None
Affects Version/s: None
Fix Version/s: None

Type: Task Priority: Normal
Reporter: yuki.moritani Assignee: Unassigned
Resolution: Done Votes: 0
Labels: EngRun, PFI, Subaru, subaru-personnel
Remaining Estimate: Not Specified
Time Spent: Not Specified
Original Estimate: Not Specified

Issue Links:
Relates
relates to INSTRM-1353 Update transformation code to handle ... Done
relates to INSTRM-1354 Provide software limit to instrument ... Won't Fix
Story Points: 4
Sprint: EngRun03

 Description   

At the fitting test to Popt2, we found that we had missed definition of InR at installation. We assumed InR=0 at installation, but it supposed to be +90. As a result, InR operation range is limited from -180 to 270. (Note sign should be double checked by someone)

From the h/w point of view, both PFI and Pop2 has the limit switch, although one is to be installed at -180 deg. So s/w should limit operation range to protect PFI.

It is not sure on which level we should limit rotation, but Gen2 (by eric) should one place to limit operation.

 Comments   
Comment by eric [ 29/Jul/21 ]

s/w control measures:

  • PARA file parameter limits on rotator position
  • Gen2 Alarm Handler warnings about approaching rotator limits
  • Only command POPT2 rotator in FREE mode (never LINK), so telescope control system does not drive it beyond -180 limit

There may be others. These are the ones that immediately come to mind.  The TCS has ultimate control over the rotator, so s/w measures in Gen2 cannot guarantee that the rotator will not be pushed into the dangerous territory by e.g. manual operation from TWS, etc.

Comment by yuki.moritani [ 31/Aug/21 ]

During Mitsubishi test in August, we discussed the limit of rotator angle. Mitsubishi will change the limit of the instrument rotator at -180 and +270 when PFS is used. (If you command the number  out of range, timeout will happen, according to Mitsubishi.) This telescope function will be tested in September.

Comment by hassan [ 15/Oct/21 ]

Work done so far sufficient. Any additional work needed will be filed as new tickets.

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