Dräger Babylog VN Series, Manual

Page: 18 / 248

18 Supplement
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Evita V series / Babylog VN series
English
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Principles of operation
Aged batteries
The following minimum battery runtime specifications apply, e.g., to batteries that
are 2 years old (NiMH, VRLA) or 4 years old (LFP), and to fully charged batteries.
The information indicates approximate values and cannot be regarded as
guaranteed for every battery. The symbol for a fully charged battery is displayed
(see "Battery charge indication on the screen", page 16). For further information
see: "Technical data", page 13.
When the internal battery and the batteries of PS500 show less than the following
minimum battery runtimes, they are considered to be spent and must be replaced.
A reduction in the capacity of batteries due to ageing and utilization is normal. As
a greatly simplified approximation, an average linear reduction in capacity can be
assumed. The current individual capacity of a battery depends on the following
factors, among others:
– Age
– Utilization (frequency, duration, and power consumption)
– Battery charge
– Ambient temperature
Observe the following information: "Battery test", page 10.
9.1.4 Alarm behavior during battery operation
The switch-over of the device to battery operation is indicated by the Battery
activated alarm (see "Alarm – Cause – Remedy", page 8). The alarm can be
acknowledged by the user. Consequently, the Battery activated alarm will no
longer be displayed until the mains power supply is re-established.
When the device is equipped with a PS500 power supply unit, in battery operation
the PS500 is discharged first. If the mains power supply has not been re-
established, the device switches over to the internal battery after the battery runtime
of the PS500 has elapsed. The switch-over is indicated by the
Internal battery
activated alarm.
At the end of the battery runtime of the internal battery, the device issues the
Battery low alarm. The Battery depleted alarm follows after that.
These alarms appear at the time specified by the model-based calculation for the
particular battery.
Battery used
(battery type) Minimum battery
runtime without
operating a GS500 Minimum battery
runtime while
operating a GS500
Internal battery 22 min 11 min
PS500 (VRLA) 120 min 60 min
PS500 (LFP) 190 min 90 min