3-10
V60 Ventilator Service Manual
1049766 Rev A
Chapter 3: Theory of Operation
3.2.5
Motor Controller (MC) PCBA
•
Controls the blower motor according to speed or current as
commanded by ventilator software.
•
Provides electrical interfaces to the DA PCBA, oxygen and air flow
sensors, fan, and primary speaker.
•
Includes monitoring of an embedded temperature sensor in the blower
motor.
•
Includes analog to digital converters (ADCs) and digital to analog
converters (DACs) for flow control and monitoring.
•
Includes two energy storage capacitors that increase motor power
usage efficiency and power a backup audible alarm (a piezo alarm)
and Alarm LED for at least two minutes.
•
Includes EEPROM for calibration data, board identification
information, and MC PCBA power-on hours.
3.2.6
Data Acquisition (DA) PCBA
•
Provides precision measuring and signal conditioning.
•
Includes analog-to-digital converters (ADCs) and digital-to-analog
converters (DACs) for flow and pressure monitoring signals.
•
Controls the oxygen solenoid valve with 12-bit accuracy.
•
Includes barometric (measurement range 525 to 850 mmHg) and
oxygen pressure (measurement range 0 to 87 psig) transducers.
•
Includes individual patient proximal and machine pressure
transducers (measurement range -20 to +65 cmH
2
O).
•
Includes EEPROM for calibration data, board identification
information, and DA PCBA power-on hours.
•
Drives the solenoid valves mounted to the manifold.
•
Interfaces to the air and oxygen flow sensors.
3.2.7
Flow Sensors
•
Calibrated to the specific gas (air or oxygen).
•
Provide the signal source for the oxygen and air flow signals. Convert
manifold gas flow into an analog signal, which is sent to DA PCBA for
filtering and conversion.
•
Air flow sensor measures flows from -240 to 240 SLPM. Oxygen flow
sensor measures flows from 0 to 240 SLPM.
•
Includes EEPROM for calibration data, board identification
information, and power-on hours for each flow sensor.
MC PCBA
DA PCBA
Oxygen flow sensor
Air flow sensor
