Siemens FS20 - Operation with Battery Backup

Determining the compact stations
Supply concept
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Building Technologies
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Fire Safety
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11.2.1 Operation with battery backup
The ↑ stations are normally operated with a power supply unit and batteries. The
power supply unit feeds the hardware with galvanically isolated system voltage,
simultaneously charging the batteries.
Together with the batteries, the power supply unit assumes the function of an
uninterruptible power supply unit. The batteries are permanently fed via a
monitored output. In case of a mains voltage failure, the batteries take over the
power supply of the control panel without interruption.
The hardware is optimally protected and operational interruptions can be largely
avoided.
This operation mode protects the hardware against the following:
● Voltage loss and undervoltage
● Mains overvoltage (in accordance with EN 54)
● High-energy interfering impulses (in accordance with EN 54)
Figure 62: Block diagram, power supply with battery backup
1 Electrical isolation
2 Umains / USys converter
3 Uninterrupted changeover switch
4 Batteries
5 Monitoring functions:
#MAINS: Mains voltage monitoring
#BATT: Battery monitoring
#CONV: Monitoring the output voltage
Power supply
Station
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#MAINS
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#BATT U
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