MODS1 Service Positions

RotatorServiceOrientations.png

rotAngle is in degrees, as set in the MCS Rotator Status dialog by the telescope operator.

Position rotAngle Notes
Normal (PA=0) 210° Normal starting position for PA=0\xB0
Instrument Ingress Hatch 180° Ingress only when Horizon-Pointing
Slit Mask Load Hatch 105°  
IUB & IEB-Blue Service 345° The main AC power switch is on the IUB
IEB-Red & Cable Wrap Services 285° Cable wrap end AC, Ether, & Glycol access
Red CCD Head Electronics Box 225°  
Blue CCD Head Electronics Box 45°  
Instrument Install/Remove 207° Position for MODS1 install/remove
At a given rotAngle, the position being serviced is facing outward opposite the left elevation C-ring.

This gives the clearest safe access to the service ports from one of the scissors lifts.

MODS2 Service Positions

Position rotAngle Notes
Normal (PA=0) 195° Normal starting position for PA=0° (post-install est!)
Instrument Ingress Hatch 210° Ingress only when Horizon-Pointing
Slit Mask Load Hatch 285°  
IUB & IEB-Blue Service 165° The main AC power switch is on the IUB
IEB-Red Service 105°  
Power/Glycol/Fiber Service 75° At Vertex C, gives best access to cable wrap service boxes
Red CCD Head Electronics Box 45°  
Blue CCD Head Electronics Box 225°  
Instrument Install/Remove 207°  
At a given rotAngle, the position being serviced is facing outward opposite the right elevation C-ring.

This gives the clearest safe access to the service ports from one of the scissors lifts.

-- RichardPogge - 2014 Sept 15
Topic revision: r13 - 17 Oct 2018, OlgaKuhn
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