Dinamap Pro 100V2 Instrukcja Obsługi Pobierz pdf (Strona 47)

Revision A PRO 100-400 V2 Patient Monitor Service Manual 3-7

2009829-001

Theory of Operation: 3.3 FUNCTIONAL DESCRIPTION

3.3 FUNCTIONAL DESCRIPTION

The following paragraphs provide the functional interface relationship.

The Pro Monitor contains a number of electrical & electro-mechanical

assemblies. These assemblies are:

 Power Supply Unit (PSU) PWA

 PSU Module

 Main Board

 SPO2 PWA (optional)

 Pneumatic control device

 Liquid Crystal Display (LCD) Assembly

 Printer PWA w/printer

3.3.1 PSU PWA

The PSU PWA is a low voltage DC power supply. The PSU PWA is

designed to operate from the output of the AC MAINS PSU module,

EXTERNAL DC line source, or from a 12-volt rechargeable lead-acid

battery. When the PSU PWA receives the EXTERNAL DC, a portion

of that voltage is routed to an analog input of the Secondary

Processor. The Secondary Processor uses this signal to determine

the available power sources. If a valid external power source is

available, LED lights to indicate that external power is available. If an

external power source exists, and a battery source is detected, the

Secondary Processor will send a command to turn on the Battery

Charger circuitry. If there is no external power source or the external

power source is below the required voltage, the PSU PWA will

automatically default to use the battery. Since the Pro Monitor is now

operating from the battery voltage, a sample of the battery source is

applied to Analog Digital Converter (ADC) circuit of the Secondary

Processor. From this, the Secondary Processor can determine the

charge state of the battery.

3.3.2 PSU Module

The PSU module is an AC Mains to DC converter. The PSU module

receives AC power from an external source. When AC INPUT is

applied to the PSU module, the module AC/DC Converter changes

the AC INPUT supply via rectifier circuit to a high voltage DC. The DC

power is then routed through a high frequency switching converter

and regulated to 24 vdc. This supply is connected to the PSU PWA

for further regulation.

3.3.3 Main Board

The Main Board is configured with Programmable Read Only Memory

(PROM), Random Access Memory (RAM), LED Display, Hard Keys,

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