-- JoshuaWilliams - 30 Apr 2020

Raise Primary Mirrors / Recovering from Primary Mirror Panic

Auth: Josh Williams
v1.0 April 29th, 2020

**You’ll first want to bring the telescope to zenith prior to raising a mirror.**

**Do NOT try to raise the primary mirrors while telescope is at horizon.**

(The mirror can raise at any elevation, but cannot raise while the elevation is changing. It is faster to raise the mirror while parked at zenith.)

If raising the M1 due to a mirror panic, in the appropriate (Left/Right) Primary Mirror Cell GUI (PMCL/PMCR), first click on Recover Panic. Click on All Air On to start raising air pressure.

LPMC copy 3.jpg

While air pressure is being raised, in the PMCL/PMCR GUI, click on Air Pressure to bring up the PMC Air Loops Status and Control subGUI.

LPMC A:P H:L,jpg

From PMC Air Loops Status and Control subGUI, you should keep an eye on all air loops (Blue-1, Green-2, etc.), until they reach a value between 100 & 120.


Once the air loop values are stable between 100 & 120, from the PMCL/PMCR GUI, click on Auto-Raise to start raising the primary mirror again, then click on Hardpoints to bring up the Hardpoints Status and Control subGUI.


From the Hardpoints Status and Control subGUI, you should keep an eye on the load cell values, as they go from >500 to ~0, and eventually the limits all read “OK”.


While the mirror is being raised, from PMCL/PMCR, click on Actuators to bring up the Actuators Status and Control subGUI. LPMC-Act.jpg

From the PMC Actuators Status and Control subGUI, click on Enable All to enable all actuators. You should see all disabled actuators in the “Disabled” box eventually disappear. PMC_actuators-Enable.png

From the PMCL/PMCR GUI, you should watch the weight return to 100%, and Chase state become “Idle”. LPMC-Chase-Weight.jpg

If a mirror panic happens during night observations, in the PMCL/PMCR GUI, click on Collimate. This isn’t necessary, but it can save time. The primary mirror is now ready. PSF_Coll.png

Tips & tricks

If the air pressure doesn’t want to come on when you first press All Air On in PMCL/PMCR, you can check the status of the air compressors (AC) from Environmental Control Subsystem GUI (ECS) to make sure they’re on.


Lowering Primary Mirrors

In the (Left/Right) Primary Mirror Cell GUI, click on Auto-Lower.
  1. Wait for 0% in Weight section and “Auto-lower complete” in log.
  2. In Air Control section, click on All Air Off.
  3. Wait for “Complete” message in log.

I Attachment Action Size Date Who Comment
ECS-AC.jpgjpg ECS-AC.jpg manage 157 K 30 Apr 2020 - 02:06 JoshuaWilliams  
ECS.pngpng ECS.png manage 448 K 01 Jun 2020 - 21:16 JoshuaWilliams  
LPMC A:P H:L.jpgjpg LPMC A:P H:L.jpg manage 163 K 30 Apr 2020 - 01:13 JoshuaWilliams  
LPMC copy 3.jpgjpg LPMC copy 3.jpg manage 164 K 30 Apr 2020 - 00:57 JoshuaWilliams  
LPMC-Act.jpgjpg LPMC-Act.jpg manage 89 K 30 Apr 2020 - 01:37 JoshuaWilliams  
LPMC-Auto-HP.jpgjpg LPMC-Auto-HP.jpg manage 90 K 30 Apr 2020 - 01:26 JoshuaWilliams  
LPMC-Chase-Weight.jpgjpg LPMC-Chase-Weight.jpg manage 81 K 30 Apr 2020 - 01:50 JoshuaWilliams  
LPMC-lower-air.jpgjpg LPMC-lower-air.jpg manage 164 K 30 Apr 2020 - 02:17 JoshuaWilliams  
PMC_actuators-Enable.pngpng PMC_actuators-Enable.png manage 48 K 30 Apr 2020 - 01:44 JoshuaWilliams  
PMC_airpressure.pngpng PMC_airpressure.png manage 25 K 30 Apr 2020 - 01:19 JoshuaWilliams  
PMC_hardpoints.pngpng PMC_hardpoints.png manage 41 K 30 Apr 2020 - 01:32 JoshuaWilliams  
PSF_Coll.pngpng PSF_Coll.png manage 79 K 30 Apr 2020 - 01:55 JoshuaWilliams  
Topic revision: r2 - 01 Jun 2020, JoshuaWilliams
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