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 <<O>>  Difference Topic 45FTWeatherRestrictionsAndStowing (r1.4 - 20 Feb 2008 - DavidRose)
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4 Move the antenna at a reduced rate initially to warm the drives up. How long will be situation dependant.
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4 Move the antenna at a reduced rate initially to warm the drives up. How long will be situation dependent.
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-- DavidRose - 28 Mar 2007

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-- DavidRose - 20 Feb 2008


 <<O>>  Difference Topic 45FTWeatherRestrictionsAndStowing (r1.3 - 28 Mar 2007 - DavidRose)
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Warning
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Warning

High winds take priority over snow conditions. Please ensure personal safety through prompt notifications and aggressive monitoring of hazardous weather. Use caution when tipping the antenna to snow dump after any snow or ice accumulation.

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High winds take priority over snow conditions. Please ensure personal safety through prompt notifications and aggressive monitoring of hazardous weather. Use caution when tipping the antenna to snow dump after any snow or ice accumulation.

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-- DavidRose - 6 Mar 2007

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-- DavidRose - 28 Mar 2007


 <<O>>  Difference Topic 45FTWeatherRestrictionsAndStowing (r1.2 - 06 Mar 2007 - DavidRose)
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  • Anytime snow, ice, or freezing precipitation is expected and accumulating.
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  • Anytime wet snow, ice, or freezing precipitation is expected and accumulating.
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1 Stop observing and move to stow by selecting: MANUAL then STOW from the RSCREEN antenna menu.
2 Continue to monitor weather conditions and resume normal operations when possible.
NOTE The E-stop button in the OVLBI control room may be pushed (green light off) to ensure no movement.
3 To resume observing, release the E-stop if used (green light on).
4 From the RSCREEN Antenna menu, select: MANUAL mode, STARTUP, TRACK, then AUTO mode.
NOTE If the command file requires updating, proceed to step 5.
5 From the RSCREEN Dispatch Commands menu select: TBD
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1 Stop observing by pressing the main console HALT button.
2 Press the STOW button to move to stow. Set Stow Brakes.
3 Continue to monitor weather conditions and resume normal operations when possible.
NOTE The RSCREEN GUI may also be used to accomplish stow actions if the Citect Main Console is not available.
4 To resume observing, place the Citect console to auto.
5 From the RSCREEN Antenna menu, select: MANUAL mode, change REJECT to ACCEPT, then set in AUTO mode.
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Snow or Ice-Freezing Precipitation

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Wet Snow

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1 Stop observing and move to snow by selecting: MANUAL then SNOW from the RSCREEN antenna menu.
2 Continue to monitor weather conditions and resume normal operations when possible.
NOTE The E-stop button in the OVLBI control room may be pushed (green light off) to ensure no movement.
3 To resume observing, release the E-stop if used (green light on).
4 From the RSCREEN Antenna menu, select: MANUAL mode, STARTUP, TRACK, then AUTO mode.
NOTE If the command file requires updating, proceed to step 5.
5 From the RSCREEN Dispatch Commands menu select: TBD
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1 Stop observing by pressing the main console HALT button.
2 Press the Snow East or Snow West button to move to stow. Set Stow Brakes.
3 Continue to monitor weather conditions and resume normal operations when possible.
NOTE The RSCREEN GUI may also be used to accomplish stow actions if the Citect Main Console is not available.
4 To resume observing, place the Citect console to auto.
5 From the RSCREEN Antenna menu, select: MANUAL mode, change REJECT to ACCEPT, then set in AUTO mode.
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-- DavidRose - 18 May 2006

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Ice-Freezing Precipitation

STEP ACTION
1 Stop observing by pressing the main console HALT button.
2 Press the STOW button to move to stow. Set Stow Brakes.
3 Continue to monitor weather conditions and resume normal operations when possible.
NOTE The RSCREEN GUI may also be used to accomplish stow actions if the Citect Main Console is not available.
4 To resume observing, place the Citect console to auto.
5 From the RSCREEN Antenna menu, select: MANUAL mode, change REJECT to ACCEPT, then set in AUTO mode.

Temperature

STEP ACTION
1 Stop observing if the air temperature drops below zero degree F by pressing the main console HALT button.
2 Press the STOW button to move to stow. Set Stow Brakes.
3 Monitor weather conditions. Continue to step 4 after the temperature remains above zero degree F for one hour.
4 Move the antenna at a reduced rate initially to warm the drives up. How long will be situation dependant.
5 Resume observing operations.

-- DavidRose - 6 Mar 2007


 <<O>>  Difference Topic 45FTWeatherRestrictionsAndStowing (r1.1 - 18 May 2006 - DavidRose)
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%META:TOPICINFO{author="DavidRose" date="1147973820" format="1.0" version="1.1"}% %META:TOPICPARENT{name="TelescopeOperations"}%

TELESCOPE OPERATIONS

45FT WEATHER RESTRICTIONS AND STOWING

Warning

High winds take priority over snow conditions. Please ensure personal safety through prompt notifications and aggressive monitoring of hazardous weather. Use caution when tipping the antenna to snow dump after any snow or ice accumulation.

During routine observing or tests that require antenna motion, the 45FT should be stowed when:

  • The 1 minute averaged wind speed exceeds 30mph on any sensor.

  • Any gust > 35 Mph is observed on any sensor.

Antenna motion may resume after a period of 15-30 minutes where winds remain below thresholds. Use your judgement.

  • Anytime snow, ice, or freezing precipitation is expected and accumulating.

Stowing for Winds

STEP ACTION
1 Stop observing and move to stow by selecting: MANUAL then STOW from the RSCREEN antenna menu.
2 Continue to monitor weather conditions and resume normal operations when possible.
NOTE The E-stop button in the OVLBI control room may be pushed (green light off) to ensure no movement.
3 To resume observing, release the E-stop if used (green light on).
4 From the RSCREEN Antenna menu, select: MANUAL mode, STARTUP, TRACK, then AUTO mode.
NOTE If the command file requires updating, proceed to step 5.
5 From the RSCREEN Dispatch Commands menu select: TBD

Electrical Storms

STEP ACTION
1 Monitor observed and forecast conditions.
2 Notify all personnel to evacuate the structure when lightning is present. Use the lightning detectors and your best judgement.
3 Advise personnel when access to the structure may resume.
4 Notify supervisor if damage has occurred. Troubleshoot and notify additional personnel as needed.

Snow or Ice-Freezing Precipitation

STEP ACTION
1 Stop observing and move to snow by selecting: MANUAL then SNOW from the RSCREEN antenna menu.
2 Continue to monitor weather conditions and resume normal operations when possible.
NOTE The E-stop button in the OVLBI control room may be pushed (green light off) to ensure no movement.
3 To resume observing, release the E-stop if used (green light on).
4 From the RSCREEN Antenna menu, select: MANUAL mode, STARTUP, TRACK, then AUTO mode.
NOTE If the command file requires updating, proceed to step 5.
5 From the RSCREEN Dispatch Commands menu select: TBD

-- DavidRose - 18 May 2006


Topic 45FTWeatherRestrictionsAndStowing . { View | Diffs | r1.4 | > | r1.3 | > | r1.2 | More }
Revision r1.1 - 18 May 2006 - 17:37 GMT - DavidRose
Revision r1.4 - 20 Feb 2008 - 15:20 GMT - DavidRose 		Content copyright © 1999-2007 by the contributing authors.
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