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12 Technical description
In the event of operation at a high ambient temperature, a safety device might limit the battery charge.
This can have a significant effect on the charging time and operating duration of the battery.
Note:
The battery takes about 10 hours to charge (at ambient 25°C).
When the unit is switched off but connected to the mains or an external battery, the internal battery au-
tomatically recharges.
If the unit cannot recharge the battery because the battery is absent or defective, the following pic-
togram appears on screen:
Battery unavailable
Associated with a high-priority alarm
‘Internal battery unavailable!!! Check
battery’
12.2.4 External battery
The
Monnal T75
medical electrical equipment may be connected to a separate external power supply
to create a medical electrical system.
Two icons indicates the absence or presence of an external source.
Presence of an external battery
Presence of an external battery
In case of a power-supply disconnection, the changeover to the external battery is indicated with a low-
priority acknowledgeable alarm “Ventilator operates from external battery”.
12.3 Inputs and outputs
12.3.1 Alarm transfer
Description of the alarm transfer function
The alarm transfer function uses a dry contact to send an alarm from the ventilator to an external
module. The contact is either closed, allowing the flow of a current generated by the external module,
or open, preventing the current from flowing. This contact is accessible via the three-pin socket locat-
ed at the back of the unit.
Breaking capacity
The relay is used to switch from a maximum voltage of 24 V with a maximum current of 250 mA.
Pin configuration of the “alarm transfer” connector
Mechanical arrangement (view from rear of ventilator)
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