AVT MAGIC ISDN, Hardware Description

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PA G E 3 7
3.5 Connection to the mains voltage
The MAGIC system can be operated with an AC voltage (mains) between 90
and 253 V without the need for switching. The mains frequency can vary bet-
ween 45 Hz and 65 Hz. The power consumption is a maximum of approx.
70 W. The housing must be earthed (grounded) in accordance with local re-
gulations. This earthing is usually realised via the protective conductor
(green/yellow) of the mains cable. If the mains cable does not have a protec-
tive conductor, however, the device must be earthed via the earthing screw
(see FIGURE 3.1).
NOTE Use the mains cable provided! Do not use an extension cable
without a protective conductor! If in doubt, use additional GND!
3.6 Opening the Device
NOTE
The device must be disconnected from mains before it is ope-
ned!
Although a large part of the system configuration can be carried out from the
outside using software, it is sometimes necessary to open the device. To do
this, remove the four screws on the front panel. The panel can now be pulled
out by the handles. The keypad/display unit can also be removed. The indivi-
dual plug-in units are inserted horizontally and can easily be removed or in-
serted using the lever provided.
NOTE Dangerously high voltages can still be present on the power
supply even several minutes after it has been disconnected
from the mains. Do not, therefore, touch any component or
soldering point on the power supply!
The plug-in units of the System can be seen in the table in SECTION 2.2.
To re-assemble the unit, carry out the above steps in reverse order.