European Southern Observatory New Technology Telescope

General :
Observations :
Operations :

EMMI CCD Cryostat Exchange

EMMI RED/BLUE:

Electrical connections and disconnections should be done by a member of the ODT
(or other qualified person authorized by ODT):

To dismount:

• Print this page and from now on write a mark

in front of every operation as soon as it is finished.
At the end of operation, hand it over to NTT coordinator.
• Run CCD RON/GAIN and/or Linearity tests.
• If possible, check rotator balance, running nttadmRot
• Press rotator B emergency switch.
• Press telescope emergency switch.
• Lock pin into rotator B brake ring (behind blue side) .
• On Wemmi, shutdown the RED/BLUE DCS by pressing shutdown on the ccdControl panel.
• Switch off the ACE LCU VME chassis. Check that the power is off by using the switch on the ACEPWR board

(it is the led disable/enable switch + power on).
• Ground yourself with one hand to the structure and disconnect the 3 CCD cables

(Clock, Bias/Video and Temp.)
• Place the conductive foam over the Bias and Clock connectors.
• Disconnect the Shutter/Focus cable from the Camera (inside EMMI on the Blue  side).
• Mount the CCD mounting table over the Grating cover with the help of the crane.

On the Blue side, the counterweights close to the dewar have to be removed before.
• Attach the table and tight firmly to the CCD dewar body and set loose all nuts

(the ones that fix the Camera to EMMI and not the Camera to the CCD).
• Slide carefully the Dewar with the Camera outside by rotating the screw of the mounting table.

Check the location of the hanging ring to ensure the system is balanced.
• Remove the mounting table plus CCD and Camera slowly with the crane.
• Reinstall now the EMMI counterweights which have been removed on the blue side.
• Install dummy counterweight in place of the removed camera + CCD.
• Unlock pin out of rotator B brake ring (behind blue side) .
• Release emergency switches.

• follow the reverse procedure.
• Do not forget to :
• Reconnect Shutter/focus cables of the camera ( inside EMMI on the Blue side )
• Reinstall any counterweight which may have been removed.

 

Signatures:                            NTT                                                                      ODT
 
 
 
 
 

Note: For EMMI Red the procedure will have to be checked again when the
small vacuum pump is mounted by MEC.

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