Babytherm 8004 and 8010 Technical Description July 1999

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Contents

3

4

8010 Keypad ... 59

2.3.3

Text Display (LC display) ... 59

2.3.4

Loudspeaker ... 59

2.3.5

WT Front PCB ... 60

Trolley

Electric Height Adjustment (Optional) ... 64

3.2

Options (for Retrofitting) ... 64

Resting Surface

X-ray drawer (Babytherm 8004) ... 67 68

Gel Mattress ... 68 5.1.1

Unheated Foam Rubber Mattress ... 69

Pneumatics (Suction)

69

Schutzvermerk DIN 34 beachten. Copyright reserved.

GBF6132300T01IVZ.fm

65

Mattress 5.1

6

64

3.1

4.1 5

2.3.2

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Functional Description

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Babytherm 8004

The Babytherm 8004 is an open incubator for keeping premature babies and infants with a body weight of up to 8 kg warm. The Babytherm 8004 provides warmth by a radiant heater in “manual mode “ with automatic “skin temperature control”. The Babytherm 8004 is used in the delivery room, the neonatal ward, the children’s ward and the children’s intensive care unit. The Babytherm 8004 is operated by a doctor, or by nurses or orderlies under the supervision of a doctor.

Danger of burns! Infants who are in shock have a markedly lower than normal skin temperature, and would be overexposed if skin temperature regulation were used. Do not use skin temperature regulation for infants who are in shock!

Danger of hypothermia! Infants who have a fever have a markedly higher than normal skin temperature, and would experience hypothermia if skin temperature regulation were used. Do not use skin temperature regulation for infants who have a fever!

For internal use only. Copyright reserved.

GBF6132300T01.fm 28.06.99

Incorrect measurements! If the skin temperature sensor is used rectally in the skin temperature regulation operating mode, the core temperature is measured and regulated. Do not use the skin temperature sensor rectally!

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Functional Description

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The Babytherm 8004 includes a radiant heater, a control unit, a resting surface and a trolley.

1

2

3

D

COM

4

Fig. 1: Front view of the Babytherm 8004

Legend

For internal use only. Copyright reserved.

GBF6132300T01.fm 28.06.99

Table 1: 1

Radiant heater

2

Control unit

3

Resting surface

4

Trolley without electric height adjustment Trolley with electric height adjustment (optional)

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Functional Description

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Radiant Heater (work light/night-light, infrared rods, Central Alarm PCB, phototherapy unit (optional)) ON/OFF Switch Control Unit WT Relay PCB

WT Controller PCB

(drive, actuators, voltage selector switch)

(Microcontroller)

Transformer WT Power PCB (voltage regulator, horn)

Resting Surface Skin Temp. sensors

WT Sensor PCB

Scale (optional)

Medibus (optional)

Modem Connection (optional)

Personnel Alert (optional)

(measuring circuitskin temperature

Trolley Height Adjustment

Mains Connection

Panel (text display, 8004 keypad, 8004 WT LED PCB, WT Front PCB)

Height-adjustment power plug USA version only

Measurement Circuits

For internal use only. Copyright reserved.

GBF6132300T01.fm 28.06.99

Mains Voltage Terminal Box

Fig. 2: Block diagram of the Babytherm 8004

* The connection between the mains voltage terminal box and the height-adjustment is not available in the USA version.

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Functional Description

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1.1

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Radiant Heater

The radiant heater emits a pre-set amount of heat. A multi-conductor cable connects the radiant heater to the control unit. The radiant heater contains the following subassemblies: − Two infrared rods (600 W overall power) − Energy-saving lamp (7 W) − Energy-saving lamp (23 W) − Central Alarm PCB − Six halogen lamps (50 W) for phototherapy unit (optional) − Switched-Mode Power Supply PCB for phototherapy unit (optional).

2 1

1

3

6

2

5

4

Fig. 3: bottom view of radiant heater

Legend

For internal use only. Copyright reserved.

GBF6132300T01.fm 28.06.99

Table 2: 1

Infrared rod

2

Halogen lamps for phototherapy unit (optional)

3

Central Alarm PCB

4

Energy-saving lamp no. 1

5

Energy-saving lamp no. 2

6

Switched-Mode Power Supply PCB for phototherapy unit (optional)

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When the button for the work light is pressed, both energy-saving lamps (energy-saving lamp no. 1 and energy-saving lamp no. 2) are switched on.

For internal use only. Copyright reserved.

GBF6132300T01.fm 28.06.99

When the night-light button is pressed, only energy-saving lamp no. 1 is switched on.

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Control Unit

The control unit controls and regulates the functions of the Babytherm 8004.

D

Babytherm 8004

1 2

10

°C

k

5 1 Haut °C

3

Inop.

manuell

Haut

4

man.

12

OK

5

11

10

8

9

7

6

Fig. 4: Front view of the control unit of Babytherm 8004

Legend

For internal use only. Copyright reserved.

GBF6132300T01.fm 28.06.99

Table 3: 1

Alarm LED (red alarm LED = warning, yellow alarm LED = caution)

2

Reset key (silence key) (15 minute alarm/10 minute alarm)

3

Check key (test LEDs and audible alarm)

4

OK key

5

LEDs (green LED = operating mode, red LED = powerfail)

6

Heat level adjustment for radiant heater

7

Radiant heater ON/OFF switch

8

Skin/manual key (selector switch: manual power adjustment/skin temperature regulation)

9

Phototherapy unit ON/OFF switch (optional)

10

Night-light ON/OFF switch (energy-saving lamp no. 1)

11

Work light ON/OFF switch (energy-saving lamp no. 1 and energy-saving lamp no. 2)

12

Skin temperature regulation target value adjustment

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Functional Description

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12 11

1 Sensor

2

10 9

3

8

4 5

7

6

Fig. 5: Rear view of the control unit 8004

Legend

1

Connection for WT Sensor PCB

2

Connections for personnel alert; max. 3 devices of workplace (connections for central alarm)

3

Connection for public address system, personnel alert (connection for central alarm)

4

RS 232 interface (modem), optional

5

RS 232 interface (BabyLink), optional

6

Control unit ON/OFF switch

7

Voltage Selector Switch

8

Fuses

9

Connection for radiant heater

10

Fuses

11

Connection for mattress heater

12

Connection for mains power supply

For internal use only. Copyright reserved.

GBF6132300T01.fm 28.06.99

Table 4:

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Functional Description

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The control unit consists of the following subassemblies: − ON/OFF switch − Toroidal-core power transformer − WT Power PCB − WT Relay PCB − WT Controller PCB − Panel (8004 WT LED PCB, 8004 keypad, text display, WT Front PCB, loudspeaker).

1.2.1

ON/OFF Switch

The single pole ON/OFF switch switches the mains voltage on or off.

1.2.2

Toroidal-Core Power Transformer

The toroidal-core power transformer supplies the electronics and the mattress heater with the following alternating voltages: − approximately 24 VAC

For internal use only. Copyright reserved.

GBF6132300T01.fm 28.06.99

− approximately 9 VAC.

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Functional Description

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1.2.3

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WT Power PCB

The WT Power PCB consists of the following functional modules: − Bridge rectifier − Voltage regulator (+5 VD) − Voltage regulator (+5 VLED) − GoldCap − Charging circuit (GoldCap) − Mains voltage power failure recognition − Horn (mains voltage failure) − Alarm LED drive (mains voltage failure) − Serial data transmission − Multiplexer

For internal use only. Copyright reserved.

GBF6132300T01.fm 28.06.99

− Addressing and drive for actuators and safety relays.

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Bridge Rectifier

Voltage Regulator

+5 VD

Voltage Regulator

+5 VLED

Operating Voltage

Transformer 9 VAC

Mains Failure Recognition 1

Monoflop

WT Panel PCB

WT Controller PCB

Serial Data Transmission WT Sensor PCB

WT Controller PCB

Overtemperature *

* Component is not active

Drive/Request for Mattress Heater *

For internal use only. Copyright reserved.

GBF6132300T01.fm 28.06.99

* Component is not active

Fig. 6: Block diagram 1 of WT Power PCB

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Functional Description

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AKKU VCGX

+5 VD

ON/OFF Switch Auxiliary Contact

Horn

WT Controller PCB

Test

GoldCap

Horn Drive RESETQX

LED+

Addressing and Drive for Actuators/Relays

WT Controller PCB/ 8004 Membrane Keypad

WT Relay PCB

ANASEL +5 VLED VGCX Analog

For internal use only. Copyright reserved.

GBF6132300T01.fm 28.06.99

GCAPVOLT

Fig.

WT Controller PCB

Multiplexer

7: Block diagram 2 of WT PCB Power Supply

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Functional Description

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Bridge Rectifier The toroidal-core power transformer applies approximately 10 VAC to the bridge rectifier input from which an uncontrolled direct voltage of approximately 9 VDC is generated.

Voltage Regulator (+5 VD) The controlled operating voltage +5 VD is generated from the uncontrolled 9 V direct voltage by a voltage regulator.

Voltage Regulator (+5 VLED) The controlled operating voltage +5 VLED is generated from the uncontrolled 9 V direct voltage by a voltage regulator.

GoldCap The GoldCap supplies the horn and the mains failure LED with operating voltage in the event of mains voltage failure. The GoldCap voltage accumulator also buffers microcontroller RAM.

Charging Circuit (GoldCap) The internal + 5VD operating voltage charges via a resistor-diode circuit the GoldCap. The charging circuit is switched off once per second for testing purposes.

Mains Voltage Power Failure Recognition A monoflop recognises a failure of the mains voltage supply.

Horn (Mains Voltage Failure) A GoldCap provides for horn operating voltage in the event of a mains voltage failure.

Alarm LED Drive (Mains Voltage Failure)

For internal use only. Copyright reserved.

GBF6132300T01.fm 28.06.99

A GoldCap provides for alarm LED operating voltage in the event of a mains voltage failure.

Serial Data Transmission A driver module amplifies serial measurement data of the skin temperature, test signals and control signals.

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Functional Description

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Multiplexer The multiplexer switches the voltages (GCAPVOLT, +5 VLED) to the WT Controller PCB for testing.

Addressing and Drive for Actuators and Relays

For internal use only. Copyright reserved.

GBF6132300T01.fm 28.06.99

An addressing module, a shift register and an amplification module call up the actuators and the safety relay for the radiant heater.

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Functional Description

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1.2.4

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WT Relay PCB

The energy-saving lamps, the infrared rods, the Central Alarm PCB and the radiant heater phototherapy unit (optional) are driven by relays located on the WT Relay PCB. A triac controls the infrared rods. The WT Relay PCB contain the following subassemblies: − Voltage selector switch − Infrared rods drive/feedback − Infrared rod safety relay − Relays (energy-saving lamps, phototherapy unit (optional))

For internal use only. Copyright reserved.

GBF6132300T01.fm 28.06.99

− Drive for Central Alarm PCB.

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WT Relay PCB

LEDs

Transformer

Voltage Selector Switch ON/OFF Switch

Driver/Amplifier F5 Mains Voltage Opto Triac Alarm F1 Relay

Radiant Heater Central Alarm PCB Energy-Saving Lamp

from/to WT Power PCB

Relay Feedback Semiconduct or Relay Safety Relay Relay

Energy-Saving Lamp Infrared Rods Feedback Circuit Phototherapy Unit (optional) F4 F3

Switched-Mode Power Supply PCB

For internal use only. Copyright reserved.

GBF6132300T01.fm 28.06.99

Fig. 8: Block Diagram of WT Relay PCB

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Voltage Selector Switch The voltage selector switch allows for adapting the primary circuit of the toroidal-core power transformer to the local mains voltage.

Radiant Heater Drive/Feedback An optocoupler drives the triac, which supplies the infrared rods with mains voltage. The voltage of the infrared rods generates an acknowledgement signal with an optocoupler.

Infrared Rod Safety Relay The safety relay interrupts mains voltage to the infrared rods in the event of an error (e.g. “Inop”).

Relays (Energy-Saving Lamps, Phototherapy Unit (optional)) The relays supply the energy-saving lamps and the phototherapy unit (optional) with mains voltage.

Drive for Central Alarm PCB

For internal use only. Copyright reserved.

GBF6132300T01.fm 28.06.99

An opto triac at the WT Relay PCB drives the central alarm lamp. The opto triac supplies the Central Alarm PCB with mains voltage.

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1.2.5

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WT Controller PCB

The WT Controller PCB contains the following subassemblies: − Microcontroller − Quartz element − EPROM − EEPROM − RAM − Watchdogs − Driver elements

For internal use only. Copyright reserved.

GBF6132300T01.fm 28.06.99

− Multiplexer and A-D converter.

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GBF6132300T01.fm 28.06.99

For internal use only. Copyright reserved.

07/99

Fig. 9: Block Diagram of WT Controller PCB

6132.300 Babytherm 8004/8010

Overtemperature

WT Power PCB

WT Power PCB (safety relay) RESET AKKU

WT Power PCB

Watchdog 1 CPU

1

Watchdog 2

WT Power PCB (horn)

1

Quartz Element

1 A-D Converter

EPROM

EEPROM

WT Front PCB (inop LED)

1

Analog Alarm

D

WT Power PCB/

WT Relay PCB WT Front PCB

WT Front PCB

Page 20

8004 keypad, 7-Segment Display, Text Display, LEDs

Functional Description

WT Power PCB (drive/measurement data/ addressing/test signals)

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WT Power PCB

RAM