Datex-Ohmeda S/5 Anesthesia and Critical Care Monitors
8
Document no
.
M1125635-05
Reset
-RESET_CPU signal is transmitted to the CPU interface in case the mains voltage fails or the
power is cut off.
-RESET signal is also generated for other digital boards.
Audio amp.
Audio signal from the CPU is amplified and filtered for the loudspeaker. Amplification gain is
about 5 dB.
CPU interface
All the necessary communications between the Power supply unit and the CPU (Reset,
Powerfail and Watchdog functions) are realized in this board. Additionally, the block contains a
circuit that supervises the maintenance of CPU’s supply voltage from the battery for 15
minutes after the monitor is turned off.
Battery switch board
The Battery switch board switches the F-CU8 to external battery power, if the mains power is
lost. The board routes the ON/STBY line to the external battery connector at the rear of the
F-CU8.
There is an External Battery, 24Vdc connector for external DC supply on the board to enable
operation in GE anesthesia workstations in battery backup mode during a loss of mains power.
In this situation the monitor uses the anesthesia machine batteries.
NOTE: This External Battery, 24 Vdc connector must only be connected to the monitor battery
backup supply in GE anesthesia delivery systems. Do not use this connector for any other
purpose.
AC output for display supply has been removed from the unit to get space for the input
interface electronics of the battery backup mode.
NOTE: Removal of the AC output creates a need to use an external power supply and/or
isolation transformer for all the other displays except those that are supplied from internal DC
voltage of the F-CU8 i.e. D-LCC12A.
External components
Transformer
The power of the mains transformer is 160 VA. The secondary voltage is 21 VAC .
Depending on the voltage in use, there are three different transformers for the monitor 100
VAC, 110-120 VAC or 220-240 VAC.
Fan
The fan is switched on automatically when +32 Vd is generated (= power ON).
Loudspeaker
The loudspeaker is controlled by the audio-amplifier on the Power logic board.
Battery
6 V, 1.2 Ah sealed lead-acid battery is used to supply power to the CPU board after the power is
turned off and the power cord is disconnected. 15 min timer.
Summary of Contents for Datex-Ohmeda S/5
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