Respironics Millennium - 3.4.2 Electrical Operation

RESPIRONIGS*
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3.4.2 Electrical Operation
Refer to Figure 3-6 while reading the following discussion.
Power is supplied from the two-prong plug to the power switch.
When the power switch is ON, 120 VAC power is supplied to the
compressor motor, hour meter, cooling fan, and the main circuit
board.
The main circuit board consists of a linear power supply, pressure
sensor, software driven microprocessor, green, yellow, and red
LED's and audible alarm. The main circuit board provides the
following functions:
Transforms and rectifies the AC supply voltage to
12 VDCA for use by the board components, sole-
noids, and oxygen percentage indicator (OPI) board.
Monitors the units pressure using a pressure
transducer.
Microprocessor controls the valve and solenoid
pressure swing adsorption cycle, visual LED’s, and
audible
alarm.
The oxygen percentage indicator board provides the following
Chapter 3: Specifications, Description, Features, & Theory of Operation
CONTROLLER BOARD
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MOTOR
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CAPACITOR
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* Ultrasonically senses the percentage of concentrated
oxygen produced by the unit. rower
MILLENNIUM WIRING HARNESS pus
* Outputs an analog voltage to the Main Control
Board used to operate the green, yellow, and red Fi
, ; ; San igure 3-6
LED’s associated with the oxygen monitoring , ;
Electronic Component Block Diagram
system.
1002403 Millennium Oxygen Concentrator System Service Manual 3-12