Software Power On Self Tests (Post) - GE Datex-Ohmeda Aisys Carestation Reference Manual

Aisys

2.4.1 Software Power On Self Tests (POST)

Off State:
• AC Power is not
connected to the
machine and the
On/Standby Switch is in
the "Standby" position.
Standby State:
• AC Power is connected
to the the machine while
the On/Standby Switch
is in the "Standby"
position.
On State:
• AC Power is connected
to the machine and the
On/Standby Switch is
set to the "ON" position.
2-12
When the machine is in the "Off" state, there is no machine activity. Circuitry on the
Power Controller Board (PCB) and on the Anesthesia Control Board ACB) monitors the
On/Standby Switch for movement.
If the On/Standby switch is moved to the "On" position while the machine is in the "Off"
state (machine not connected to AC mains supply), the circuitry on the PCB engages
the batteries to power the CPU on the PCB. Standard CPU tests are performed and the
PCB application starts. Once the PCB has passed its CPU tests and the application is
running, it activates the +12 VDC circuit to power the DU and the ACB. The DU and ACB
simultaneously begin powering on. The PCB evaluates the battery capacity.
If the machine state changes from the "Off" state to the "Standby" state (machine
connected to AC mains supply), the hospital AC (stepped to approximately 180 VAC by
the isolation transformer) enters the U-frame Power Supply. The AC voltage is
converted to +12 VDC. Standard CPU tests are performed (including but not limited to
RAM, ROM, Watchdog, and application CRC) and the PCB application starts. The PCB
evaluates the battery capacity and charges the batteries, if necessary.
If the machine state changes from the "Standby" state to the "On" state, the +12 VDC
circuit to power the Display Unit (DU) and the ACB is activated. The DU and ACB
simultaneously begin powering on.
Both the ACB and the DU begin by converting the incoming +12 VDC to local needed
power (+3.3 V, +4 V, +5 V, +8 V, and others) and perform standard CPU tests. Each
board loads their software (that resides locally) and begins their appropriate self tests
described below:
• Once the ACB passes all CPU tests and application is loaded, independent circuitry
turns on 10 VA limited (+12 VDC) power to the Gas Mixer, the Ventilator Interface
Board, the Agent Delivery Board (eVap) and the M-Gas Power Supply Board. These
boards convert the incoming +12 VDC into locally need power supplies and
simultaneously begin to power up. The ACB energizes the Alt O
closes the valve. The ACB begins testing the GIV.
- The processor on the Gas Mixer board performs standard CPU tests, checks
communication link with the ACB, reports to the ACB that it has begun to
perform Power-On Self Tests (POST). The Gas Mixer tests the O
Gas channels for leaks and flow delivery from both channels. Once completed,
reports to the ACB that all Self-Tests have been completed and the Gas Mixer
compatibility information (serial number, hardware revision, and software
revision).
- The processor on the Ventilator Interface Board (VIB) performs standard CPU
tests and begins to download application software and ventilator calibration
constants from the ACB. The VIB works in conjunction with the ACB to perform
the Gas Inlet Valve (GIV) test (ACB provides valve status information to the VIB,
the VIB calculates the voltage necessary to open the valve to the desired value).
Once completed, the VIB reports to the ACB that the Self-Tests have been
completed and the VIB compatibility information (serial number, hardware
revision, and software revision).
Selector Valve, which
2
and Balance
2
04/08 M1046983