The Main Power Supply Assembly - Agilent Technologies 1100 Series Reference Manual

6
Introduction to the Variable Wavelength Dector

The Main Power Supply Assembly

The main power supply comprises a closed assembly (no on-site repair possibility).
The power supply provides all DC voltages used in the module except for the voltages
supplied by the lamp power supply to the deuterium and tungsten lamps in the
detectors. The line voltage can vary in a range from 100–120 or 220–240 volts AC ± 10
% and needs no manual setting.
Figure 53
To disconnect the instrument from line, unplug the power cord. The power supply
WARNING
still uses some power, even if the power switch on the front panel is turned off.
No accessible hardware fuse is needed because the main power supply is safe against
any short circuits or overload conditions on the output lines. When overload conditions
occur, the power supply turns off all output voltages. Turning the line power off and on
again resets the power supply to normal operation if the cause of the overload condition
has been removed.
An over-temperature sensor in the main power supply is used to turn off output voltages
if the temperature exceeds the acceptable limit (for example, if the cooling fan of the
204 1100 Series Variable Wavelength Detector Reference Manual
Main Power Supply (MPS) Blockdiagram