UNIVERSITY OF
CALIFORNIA
OBSERVATORIES
/
LICK
OBSERVATORY
ShARCS Mounting
Installing ShARCS after it has been removed for service or an instrument change
(e.g. APALO), requires you go through the following steps.
Remove right AO cross brace, if not already removed for APALO removal.
Make sure power is off to (turn off in this order if necessary):
[A6] Jade 5V power supply
[A2] 24V brake power supply
[A3] 24V motor power supply
[A5] +/- 12V servo power supply
This ensures nothing will move or short during installation.
Turn off ion pump and disconnect from ShARCS.
Install Ion pump on ShaneAO (4 bolts).
Connect 3 cables to ion pump:
Power
Serial
Ion pump cable + its ground
Make sure nuts and smaller conical washers are removed. Be sure
to keep the right washers and nuts with the right studs, and to keep
the washers in the right order. Note: cup half of washer is closest to
optical bench for all sets of washers.
Manuever the ShARCS hoist into position and align mounting plate
with SAO optical bench mount points
Make sure ShARCS clears any obsticals, particularly the lower
right dewar assembly bolt head on the bottom of the dewar clears the
lower right alignment/support bracket)
Once ShARCS is in position, on the studs, install the conical
washerss and nuts.
Make sure all washers properly seated and align.
Tighten nuts to 15 ft.lbs. with a torque wrench.
Disconnect hoist from ShARCS.
Lower and remove hoist.
Connect dewar cables:
Ion pump cable
3 motor cables (DB26 connectors)
Temperature/limit switches (large MS connector on Dewar)
Motor control cable (7pin MS connector) + its ground
Limit cable (9 pin MS)
Dewar electronics power + its ground
Dewar USB (mini)
Turn on ion pump, including the high voltage.
Turn on, in order:
[A6] Jade 5V power supply
[A5] +/- 12V servo power supply
[A3] 24V motor power supply
[A2] 24V brake power supply
Rotate ShARCS window cover to open.
Once sure that ShaneAO is up and aligned (see Startup Procedures), take images with
ShARCS to evaluate alignment. If alignment close enough that
adjusting the final fold mirror is sufficient, proceed to next
steps. If not, will need to shut down ShARCS, put motors in safe
state, and use hoist to adjust ShARCS position.
Remove front hoist bracket from ShARCs.
Install Science Filter Wheel and connect its 3 cables:
BNC
Power
Serial
Make sure science filter wheel works.
Install AO frame cross brace. (16 bolts).
Elinor Gates
Last modified: Fri Oct 10 15:43:00 PDT 2025