Monitoring Pcb; Measurement Of Analog Signals; Measurement Of Digital Inputs; Measurement Of Digital Outputs - Dräger Babylog 8000 Technical & Service Manual

Function description
10.6

Monitoring PCB

The Monitoring PCB measures and monitors all measurement and status signals. The Monitoring PCB
compares these signals with the signals from the CPU 68000. If an error occurs, the Monitoring PCB
switches off the valves, activates the audible alarm generator, and resets the CPU PCB.
A Z80 microprocessor (minimum system) controls the Monitoring PCB. The Monitoring PCB
communicates with the CPU 68000 via a bus interface.
10.6.1

Measurement of Analog Signals

O concentration
2
Potentiometers (O
Pressure P
insp
System temperature
Supply voltages (potentiometer reference, rechargeable battery, GNDA, GND reference, 27 V)
Valve voltage
10.6.2

Measurement of Digital Inputs

STATUS CPU 68000 (reset)
STATUS flow (reset)
STATUS I/O (printed circuit board is available)
STATUS valves (current and drive monitoring on the Pneumatics Analog PCB)
Powerfail
Position of power switch
10.6.3

Measurement of Digital Outputs

Alarm LEDs (2 LEDs on the Display PCB)
Flow test 1 and 2 (for Flow PCB)
Switching on of valve relays K1 and K2 (voltage supply to valves and PEEP/PIP valve on the
Pneumatics Control PCB)
CPU PCB reset
7-segment status display for error messages
Standby audible alarm generator
Loudspeaker monitoring via microphone
Battery charging and testing circuit
Test of the supply voltages +5 V, +15 V, –15 V (Display PCB)
42
Dräger Medical AG & Co. KGaA
, Vinsp, T , T , P , PEEP/CPAP)
2 I E insp
6173.3
Babylog 8000