FEI Quanta FEG 250, User'S Operation Manual

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System Operation: Quanta FEG System States
3-9
POWER OFF
Take sufficient measures to avoid power failures as much as possible.
If it occurs while the instrument is completely operational, the
microscope comes down to a safe state and the following happens:
• The accelerating voltage is switched off abruptly.
• The specimen chamber vents gently, automatically.
• The column isolating valves close to save the vacuum in the gun
areas.
• The momentary adjustments of all system parameters
(accelerating voltage, magnification, stage positions) are lost if
they were not saved.
The Emergency Off
is similar to that which would happen after a MAINS power off. Here
are several possibilities how to quickly switch off the electrical power
completely in case of emergency:
1. Push the red EMERGENCY (EMO) button (option - see the Safety
Manual).
If the button is not installed proceed as follows:
2. Switch off the breaker switch labeled MAINS S1 at the cabinet
back, which is placed at the very right side in the row.
FIGURE 3-2 MAINS SWITCH BOARD
If this is not easily accessible:
3. Turn off the mains wall switch (if present), and / or disconnect the
mains plug from the mains socket.
UPS (option)
If the power failures occur occasionally it is reccomended to use the
microscope Uniterruptible Power Supply (UPS - option), which
maintains the FEG emmision for several hours.
In case of mains power off the microscope is powered by UPS
batteries and the system starts 10 minute countdown. If the mains
power is recovered within this time, the countdown is canceled and
nothing happens. After 10 minutes of continuous power off a
shutdown with following actions is activated:
• FEG emission is gently switched off
• chamber is vented
• UI is stopped
• server is stopped
• console is shut down
• microscope PC and Support PC (if present) are switched off
User is informed about the countdown in the application status
window (see below) together with the remaining time. When the xT
microscope Server is started the first time after this event, a dialog is
displayed to inform an user.