How to Attach/Detach FOCAS to Cs flange

(simplified version)

8/5/2002 ver.

Youichi Ohyama (FOCAS SA)

Attachment

Power-off

Push green button on the FOCAS power distribution panel (gray box mounted on IR/front side of FOCAS at eye level).

Loading on CIAX cart and movement

Jacking up at stand-by flange

Only small room is available between FOCAS and the CIAX cart. Watch carefully the bottom of FOCAS when jacking up the CIAX cart.

A yellow vacuum valve behind FOCAS is closest to CIAX.

Black line is the rail on which CIAX cart moves. Both side and bottom parts of FOCAS are very close to the CIAX cart.

External power supply

In order to keep the CCD temperature at the operating temperature, FOCAS needs an external power supply on CIAX cart. Keep the power extension cable connected.

The external power is supplied at the power strip on the FOCAS footing while moving on CIAX cart.

Lower (outer) power strip is for external power supply, upper (inner) is for internal power supply. In these pictures, FOCAS is powered by internal power supply.

You may disconnect the cable for a short period (<2 minutes).
Be careful in handling a long cable around FOCAS.

Check the power occasionally by looking some of LEDs around the bottom of FOCAS (see below for the location of the lamps).

Separating FOCAS footing at Cs flange

When FOCAS is under the Cs flange, disconnect the footing before jacking up to the Cs flange.

Screw off four (4) pins by rotating screws by hand if remote control system is not working.

Switch on the power supply

After switch on the Cs power supply, push red button on the FOCAS power distributing box.

Remove external power supply

Remove all plugs on the FOCAS footing, and plug them into another power strip for internal power supply attached to the FOCAS main body (just above the power strip on the footing for external power supply).

Lower (outer) power strip is for external power supply, upper (inner) is for internal power supply. In these pictures, FOCAS is powered by internal power supply.

Items to be checked

Ion Pump: at IR side, at foot level. Some LEDs should be lit behind the lid.

Vacuum gauge: at rear side, at foot level. A numerical display should be lit behind the lid.

Temperature controller: Opt side, at foot level. A numerical display should be lit behind the lid.

Should be ~-100C.
If temperature is stable, it is OK even if temperature is slightly higher than -100C (-90C ~ -100C).
If temperature rises continuously over 0.5C in one minutes, something is wrong.

Cooler controller: Rear side, at foot level. Power switch should be lit in orange.

Air pressure gauge: Opt side, at side of a black insulator box at eye level. A numerical display should be lit behind the lid.

Air pressure should be 560-600 on the gauge.

When pressure is not high enough...

Go to the IR compressor room, and check the red craftsman. Read the output pressure gauge at the compressor, and adjust the knob to rise the pressure to 90-100 psi. Go back to FOCAS, and check the pressure gauge again.

left: tank pressure gauge, right: output pressure gauge

If pressure is getting lower, something is wrong.

Compressor might be off, or there is a leak somewhere.

Others

Check if something are on the FOCAS (your helmets, screw drivers, etc.) before doing balancing the telescope. Check if every door is closed around FOCAS.

Detachment

When attaching the FOCAS footing into the FOCAS main body, watch carefully the interface between the FOCAS main body and the footing and check if any cables are around the positioning pins.

Just send it back to the stand-by flange. Do not switch back on.