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Servo...
Power supply
Functional Main Blocks diagram marking: "P"
The main block P
S
OWER
UPPLY
mains power to internal power supply as well as the
Module unit-connections for optional Battery modules
and/or other optional modules.
The power modes in the Servo... System are:
• At Power up, i. e. when the On/Off switch is turned
On, all internal voltages will be enabled.
• At Power down, the Power supply system will
deactivate the hardware signal P
at the same time keep the internal voltages +5 V
and +3.3 V for at least 1 ms, in order to let the
different subsystems save their current settings in
non-volatile memory. Power down can be caused
by:
– Turning the On/Off switch Off.
– Mains failure and no back-up battery connected.
– The system is powered from a battery, but the
battery voltage is too low for proper operation of
the system.
In this Off mode, only charging of Battery modules
is enabled (if the system is connected to mains).
All other circuitry is un-powered.
• In Standby all circuitry is powered from the Power
supply, but no breathing will be active. The operator
can set all parameters, including breathing mode,
during Standby.
Mains inlet
Appliance inlet for mains power supply including
grounding connection.
The Servo... System will automatically adjust to the
connected mains power if the mains power is within
specified range. No voltage or frequence setting is
required.
The mains inlet is equipped with two mains power
fuses, F11 and F12, rated 2.5 A.
AC/DC Converter
Converts the connected AC Power to the internal DC
supply voltage +12 V_U
NREG
E382 E407E 061 01 01 02
comprises conversion of
_G
.H, and
OWER
OOD
.
Siemens-Elema AB
PC 1778 Standard connectors & DC/DC
Converts the internal DC supply voltage +12 V_U
into the following internal DC supply voltages:
• +3.3 V
• +5 V
• ±12 V
• +24 V
All standard connectors are located on this board.
The connectors are the following:
• N26 – External +12 V DC supply input. The
connectors is equipped with a fuse F1, rated 10 A.
• N27 – Optional equipment.
• N28 – Control cable.
• N29 – RS232.
Pin configuration and signal names can be found in
chapter "Diagrams".
Includes also an ID PROM. The ID information can be
read by the Servo... System.
PC 1775 Plug-and-play back-plane
Connects the Optional Modules that are inserted in
the Module Unit. Controls charging of the Battery
modules.
Includes also an ID PROM. The ID information can be
read by the Servo... System.
Module unit
Connection slots for 6 optional modules, e. g. Battery
modules.
Internal fan
The I
F
forces cooling air through the patient
NTERNAL
AN
unit. The air inlet is protected by a filter that must be
cleaned or replaced during the "Preventive
maintenance". The cooling air outlets are located in
the expiratory section.
The I
F
is controlled by the T
NTERNAL
AN
S
in the I
ENSOR
NSPIRATORY SECTION
with half effect at approx. 33 °C and with full effect at
approx. 43 °C.
Description of functions
NREG
EMPERATURE
. The fan will start
3 - 9
3
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