2
Servo Ventilator 300/300A
Description of functions
E382 E380E 061 01 03 01
Siemens-Elema AB
79
21.4 Power temperature control
A NTC-resistor on PC 1618 senses the air
temperature inside the power section.
If the air temperature inside the power
section exceeds approx. 41°C (106°F), the
19.1
COOLING
FAN
is turned on. When the
temperature drops below approx. 40°C
(104°F), the fan is turned off.
If the air temperature inside the power
section exceeds approx. 48°C (118°F), the
+24 V power supply (+24 V
PO
) to the
auxiliary outputs N77 and N78 is disconnec-
ted. When the temperature drops below
approx. 48°C (118°F), this power supply is
reconnected.
21.5 Charge control
The internal battery is automatically charged
if an external power supply (mains power or
external battery) is connected. The front
panel LED Charge Int. Batt. indicates if the
internal battery is in charge mode. During
charge mode, one of the following three
different battery charge levels is used:
•
Level 1
if the battery voltage level is below
18 V. The battery is charged with 20 mA.
This low battery voltage level may indicate
a faulty battery, and the low charge
current is selected to prevent damages
due to a faulty battery.
•
Level 2
if the battery voltage level is
between18 – 29 V. The battery is charged
with up to 500 mA.
•
Level 3
is a trickle charge level that will
charge the battery with up to 50 mA to
keep the voltage level at approx. 27 V.
The time to recharge a discharged battery
can be up to 8 hours.
22 Operating power
22.1 Internal battery
There are two 12 V sealed lead acid
batteries connected in series inside the
power section used as an internal 24 V
battery for backup purposes. The batteries
are rated 12 V, approx. 1.9 Ah.
The internal battery voltage level can be
displayed in the ”Alarm and Message”
display on the front panel.
Service interval approx. 3 years for
exchange of the internal batteries. After
replacement, allow the batteries to recharge
before clinical use of the ventilator.
The lifetime of the internal batteries are
reduced if the batteries are used frequently
to supply the ventilator with operating
power. The batteries should not be
recharged more than approx. 130 times to
keep stated backup capacity.
22.2 External battery inlet
The external battery inlet is a three-pin male
connector at the power section panel. The
external battery inlet is rated 24 V. When
connected, the voltage of the external
battery must be within approx. 23 – 30 V.
Pin configuration and signal names can be
found in chapter "
The external battery will not be charged by
the mains power supply.
The external battery voltage level can be
displayed in the Alarm and Message display
on the front panel.
Содержание Servo Ventilator 300
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