NRAO Home  >  Green Bank  |  Wiki Topic:    GB > Observing > CommissioningMeetings > CommissioningMeeting07Aug24
   Changes | Index | Contents | Search | Go

GBT Operations & Commissioning Meeting

24th August 2007

AGENDA


Upcoming Activities -- Carl

Activities List


Az Track, Antennae Report -- Bob

Continental has machined two and a half welds as of this morning. The work is painstakingly slow, but is giving good results. We have had delays due to thunderstorms a couple of nights, which is pushing completion of all work out to the 31st at this point. SATCOM is cleaning up the grout surfaces, and will fill voids this coming week. They will also do final adjustments of the wear plates over the remaining sections as Continental finishes machining, and then grout them in at the end of the week. Unless we experience more delays because of lightning, we should make the telescope available for characterization September 1.

The "fat lady" has arrived at the concert hall, and is warming up!

We also had a field work kick-off meeting with Harris Fire Protection of Baltimore, MD, who will furnish and install the fire protection systems in each of the rooms on the telescope. This work will likely occur in late September or October, and we'll have to coordinate some maintenance days to fit this in. Some components will require RFI evaluation/shielding, which will have to be done before installation.

Painting continues through next week. The stairs are being re-installed and painted now, and after grating is put down, should be available for service next week.

Bob Goldizen and the mechanics have gone through almost all of the servo system motors, and should finish up next week as well.

Provided the azimuth track work necessary to permit motion is completed as outlined above, the first week in September marks the return to dynamically scheduled maintenance days for the high frequency observing season.


Observing News -- Toney

With PF1 out of commission, we did not do any observing this past week. With the delay in getting PF1 fixed it is unlikely that we will do any observing during the next week. We are open to suggestions of tests, etc. that can be performed during this time.


Scheduling Status -- Carl



Microwave Electronics Status -- Steve

Operations

Development


Digital Electronics Status -- Randy

Digital Group Status 18-AUG-07 THRU 24-AUG-07

***Operations, Problem Summary***

No significant events to report this week.

***Maintenance***

Active Surface...

No work was done on the Active Surface this week.

***Development***

CICADA (Advanced Digital Backends Program)...

Spectrometer LTA Re-design...

ALMA...

On-going efforts are continuing fairly smoothly on the ALMA front.

***Plans For Next Week***

Randy


Servo Systems Status -- John and Tim

Operations, Problem Summary

The 45 Meter was having intermittent problems on the Citect display. Later it became more severe and began showing up in the RTAI Linux Servo System. We initially switched the computer rack to MG power to no avail. Next we took the UPS out of the circuit and all the errors went away except two. One warning is probably a PLC module. The other is a Dec Encoder issue. We have looked at the encoder, the power, the data etc and it all looks clean. We are now monitoring the DC and AC power to the system. I have modified software to help diagnose the problem but cannot get it installed until Monday.

Development

The GBT PLC upgrade is going smooth. Last Friday and this week we have activated all the limits, E-Stops, lockouts, Motor Faults, Circuit Breakers, Disconnects, etc. Just a few monitor points remain to be "unofficially" checked out. We have also retracted and inserted the elevation stow pin and moved in elevation in the low and high rate modes. These moves were done using the PMU, MRU, and MSU. We also checked out the circuitry to the azimuth motor controllers (with the motor controllers disabled) and all up to that point looks good. The only interface to the system that has not been tested is the "computer" interface. The only axis we have not moved is the azimuth axis (hum, I wonder why.)

We found that the azimuth limit switches are not functioning. The azimuth redundant limit switches are the only ones keeping us from going through the wrap. We verified this under normal configuration also. This will be investigated early next week. (It appears we have some type of latent error.)


Software Status -- Amy

We are in the sixth development cycle of 2007. Please see the PlanOfRecordC62007 for all of the division's assigned activities.

Operational & User Support

Operational and user support was very light this week.

Modification Requests/Tasks


Computing -- Chris

The UPS that failed during the power outage last week has been replaced.

The new cisco switches for the servo room have now arrived, only a few small parts are still required. Installation planning can proceed once these are available.


PTCS -- PTCS Team


Pulsar Related -- Scott


MIT/LL 43m Project -- Glen


Commissioning Plans -- Toney

It was decided that we will go with the single polarization per beam version of the Ka-band receiver.

The PF1 receiver replacement amp turned out to also be defective. Gary will take his time to make sure the PF1 receiver gets done correctly. Gary forsees no problems with working on Q-band and PF1 at the same time. The only possible issue is the sharing of lab test equipment between Ka, Q and PF1 work.

K-band is currently scheduled to be cooled next week.

At present there does not appear to be any impact on the commission schedule from the delay in PF1.


Any other Business

-- RichardPrestage - 23 Aug 2007

Topic CommissioningMeeting07Aug24 . { Edit | Attach | Ref-By | Printable | Diffs | r1.13 | > | r1.12 | > | r1.11 | More }
Revision r1.13 - 24 Aug 2007 - 15:53 GMT - ToneyMinter
Parents: WebHome > CommissioningMeetings
Content copyright © 1999-2007 by the contributing authors.
All material on this collaboration platform is the property of the contributing authors.