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 <<O>>  Difference Topic 43MeterWeatherRestrictions (r1.6 - 08 Feb 2008 - DavidRose)
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-- DavidRose - 6 Mar 2007

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-- DavidRose - 8 Feb 2008


 <<O>>  Difference Topic 43MeterWeatherRestrictions (r1.5 - 06 Mar 2007 - DavidRose)
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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.

 <<O>>  Difference Topic 43MeterWeatherRestrictions (r1.4 - 06 Mar 2007 - DavidRose)
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2 Press the STOW button to move to stow. Gear brakes will set upon reaching stow and the system will remain in Manual control.
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2 Press the STOW button to move to stow. Set Stow Brakes.
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Snow

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Snow Sticking to Dish

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1 Monitor observed and forecast conditions. Stow if surface accumulation has occurred, is likely, or is forecast.
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1 Monitor observed and forecast conditions. Stow if surface accumulation is likely or in progress.
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3 Press the SNOW EAST or SNOW WEST button to move the telescope to a snow dump position.
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3 Press the SNOW EAST or SNOW WEST button to move the telescope to a snow dump position. Set Stow Brakes.
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3 Terminate observing/maintenance operations and move the telescope to the stow position if surface accumulation is likely or forecast. See "Stowing for Winds" section for required steps.
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3 Terminate observing/maintenance operations and move the telescope to the Snow East or Snow West position. Position so that dish faces away from wind to reduce blown on accumulation. Set Stow brakes.
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-- DavidRose - 12 Oct 2006

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-- DavidRose - 6 Mar 2007


 <<O>>  Difference Topic 43MeterWeatherRestrictions (r1.3 - 13 Oct 2006 - DavidRose)
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Add an entry to the 43meter log (within the RSCREEN GUI using the DISPATCH/TECH menu options) anytime observing is interrupted for weather.

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-- DavidRose - 18 May 2006

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-- DavidRose - 12 Oct 2006


 <<O>>  Difference Topic 43MeterWeatherRestrictions (r1.2 - 18 May 2006 - DavidRose)
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1 Stop observing.
2 Move the antenna to stow position using either the Citect Console in manual mode or the 43m-console (RSCREEN) GUI.
3 Resume observing/testing after a period of > 15-30 minutes where winds remained below limits.
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1 Stop observing by pressing the main console HALT button.
2 Press the STOW button to move to stow. Gear brakes will set upon reaching stow and the system will remain in Manual control.
NOTE The RSCREEN GUI may also be used to accomplish stow actions if the Citect Main Console is not available.
3 Resume observing/testing by pressing the AUTO button after a period of > 15-30 minutes where winds remained below limits.
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1 Monitor observed and forecast conditions.
2 Terminate observing/maintenance operations and move the telescope to a snow dump position (East or West) if surface accumulation is likely or forecast. Use the Snow East or Snow West options on the Citect Console to tip at a slow rate, especially if accumulation has already occurred. Rotate the dish to face away from wind to reduce blown on accumulation.
3 Continue to monitor weather conditions and resume normal operations when possible.
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1 Monitor observed and forecast conditions. Stow if surface accumulation has occurred, is likely, or is forecast.
2 Stop observing/testing by pressing the main console HALT button.
3 Press the SNOW EAST or SNOW WEST button to move the telescope to a snow dump position.
NOTE Tip at a slow rate, especially if accumulation has already occurred. Rotate the dish to face away from wind to reduce blown on accumulation.
4 Continue to monitor weather conditions and resume normal operations when possible.
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3 Terminate observing/maintenance operations and move the telescope to the stow position if surface accumulation is likely or forecast.
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3 Terminate observing/maintenance operations and move the telescope to the stow position if surface accumulation is likely or forecast. See "Stowing for Winds" section for required steps.
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NOTE Initial antenna moves after the storm should be made at a reduced rate.
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NOTE Initial antenna moves after the storm should be made at a reduced rate and possibly under on-site supervision depending on the severity of the storm.
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-- DavidRose - 01 May 2006

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-- DavidRose - 18 May 2006


 <<O>>  Difference Topic 43MeterWeatherRestrictions (r1.1 - 01 May 2006 - DavidRose)
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%META:TOPICINFO{author="DavidRose" date="1146518670" format="1.0" version="1.1"}% %META:TOPICPARENT{name="TelescopeOperations"}%

TELESCOPE OPERATIONS

43 METER WEATHER RESTRICTIONS

Warning

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

During routine observing or tests that require antenna motion, the 43 Meter should be stowed when:

  • The 1 minute averaged wind speed exceed 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.

Stowing for Winds

STEP ACTION
1 Stop observing.
2 Move the antenna to stow position using either the Citect Console in manual mode or the 43m-console (RSCREEN) GUI.
3 Resume observing/testing after a period of > 15-30 minutes where winds remained below limits.

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

STEP ACTION
1 Monitor observed and forecast conditions.
2 Terminate observing/maintenance operations and move the telescope to a snow dump position (East or West) if surface accumulation is likely or forecast. Use the Snow East or Snow West options on the Citect Console to tip at a slow rate, especially if accumulation has already occurred. Rotate the dish to face away from wind to reduce blown on accumulation.
3 Continue to monitor weather conditions and resume normal operations when possible.

Ice-Freezing Precipitation

STEP ACTION
1 Monitor observed and forecast conditions.
2 Restrict personal access if structure walkways/surfaces become slippery.
3 Terminate observing/maintenance operations and move the telescope to the stow position if surface accumulation is likely or forecast.
4 Continue to monitor weather conditions and resume normal operations when possible.
NOTE Initial antenna moves after the storm should be made at a reduced rate.

-- DavidRose - 01 May 2006


Topic 43MeterWeatherRestrictions . { View | Diffs | r1.6 | > | r1.5 | > | r1.4 | More }
Revision r1.1 - 01 May 2006 - 21:24 GMT - DavidRose
Revision r1.6 - 08 Feb 2008 - 14:06 GMT - DavidRose 		Content copyright © 1999-2007 by the contributing authors.
All material on this collaboration platform is the property of the contributing authors.