Theory of Operation
38
40-5648-51B
Power control description
The power control logic provides two functions, power
management, and triggers alarms when the main micro-
processor fails. Refer to the Power Control Logic section
of the Main PC Schematic for details.
Auxiliary Controller
Power Control
Watchdog
Alarm Circuit
Super Capacitor
Audio
Buzzer
Processor
Reset
Circuit
Buzzer
Detector
5 Volt Always
On Supply
Mains Supply
Battery
External DC
Logic Supply
Test Supercap
Reset to Processor
Monitor Super Capacitor
Processor A/D Channel AN1
Main Power On
Watchdog Alarm
Flowchart of Power Control Description.
Always on supply, U7
A 5-volt linear regulator provides power to the time of
day clock and auxiliary controller, while maintaining a
charge on the super capacitor.
•
This supply is always active provided a power source
is present be it the regulated mains AC power, bat-
tery, or external DC.
Backup super capacitor, C11
This device provides backup power to the audio buzzer
in the loss of the primary power source, a
1 Farad Super
Capacitor
is part of the power control design.
•
The super capacitor voltage supercap_detect
,
is monitored through the microprocessor’s A/D
converter channel by the microprocessor asserting
supercap_test
when the pump is turned on.
Backup audio buzzer, XD1
The audio buzzer provides a means to generate a backup
audible alarm during:
•
instrument power loss
(while the instrument was on)
•
malfunction of the main microprocessor
•
or
failure of the primary speaker
.
Содержание Medfusion 3000 Series
Страница 1: ...s Medfusion 3000 Series Technical Service Manual ...
Страница 2: ...Table of Contents ii 40 5648 51B ...
Страница 20: ...Introduction 14 40 5648 51B ...
Страница 32: ...Scheduled Maintenance 26 40 5648 51B ...
Страница 80: ...Troubleshooting 74 40 5648 51B ...
Страница 116: ...Calibration Adjustment 110 40 5648 51B ...
Страница 158: ...Assembly Drawings Parts Lists 152 40 5648 51B Medfusion 3000 series main pump assembly See Note 1 ...
Страница 160: ...Assembly Drawings Parts Lists 154 40 5648 51B Case bottom assembly Medfusion 3500BC ...
Страница 162: ...Assembly Drawings Parts Lists 156 40 5648 51B Case top assembly w plunger ...
Страница 164: ...Assembly Drawings Parts Lists 158 40 5648 51B Case top assembly without plunger ...
Страница 167: ...Assembly Drawings Parts Lists 161 40 5648 51B Barrel clamp assembly GREASE SILICONE III SOLDER NO CLEAN ...
Страница 172: ...Assembly Drawings Parts Lists 166 40 5648 51B Accessories parts list Poleclamp assembly ...
Страница 182: ...Index 176 40 5648 51B ...
Страница 183: ......