GE Datex-Ohmeda Aisys Carestation Reference Manual page 39

2.2.4 Power
Controller Board
M1046983 04/08
This board is a self-monitored and self-controlled by an on-board microcontroller.
Much of its circuitry is used to monitor things like operating temperature of the board,
battery status, battery charging, and communication to the Display Unit.
Its primary function is to distribute voltages to other subsystems and to keep the
batteries charged.
The Power Controller Board has eight (8) connectors (populated):
• J1 is the battery connector
• J2 is not used
• J3 is Power Out to the Display
Controller (Display Unit)
• J4 is the Power Out to the Anesthesia
Control Board
• J5 is Fan 2
• J6 is the 28 VDC in from the U-Frame
Power Supply
• J7 is Fan 1
• J8 is the optional Battery Backup for
the Anesthesia Monitor
• J9 is the voltage adjust connector for
the U-Frame Power Supply
Connector J9 connects the U-Frame
Power Supply to the Power Controller
Board where circuits on the Power Controller Board monitor the battery charge
requirements. Signals sent through J9 can "boost" or "reduce" (adjust) the 28VDC
output of the U-Frame Power Supply when the batteries need charge or they are fully
charged.
The Power Controller Board has seven LEDs: three indicate battery charge status:
• OVER: When in "Over Charge" mode, a high voltage (+ 16 VDC) , but current limited,
is applied to the batteries. This is used to 'top-off' the batteries. This also breaks-
down the oxidation that happens with lead acid batteries.
• FLOAT: Trickle charge used to maintain fully charged batteries.
• CHG: Also known as Bulk Charge. Used to charge the batteries with constant current.
OVER FLOAT
J4
J8
J9
J6
CHG
2 Theory of Operation
J3
J1
J5 J7
2-7