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1MRS750881-MUM
REC 523
25
Remote Monitoring and Control Unit
Technical Reference Manual
The auxiliary voltages of the PSC versions are:
• PSC1:
Operating range 80...265 V AC or DC.
• PSC2:
Operating range 18...80 V DC.
The primary side of the power supply module is protected with a fuse located on the
printed circuit board of the module.
The power supply also provides a 12 V DC output voltage to an external
communication device, for example, a radio telephone. The maximum peak output
current is 7A with batteries and 1A without batteries. This is sufficient for most
conventional radio telephones or radio links.
For further technical data of the power supply, refer to Section 7.1. Technical data.
5.2.2.
Power backup
Power backup for the station can be arranged by connecting 24 V (2 x 12 V) sealed
lead acid batteries to the REC 523 device. The batteries supply the REC 523 device
and the communication device during a mains failure. Thus the communication
between the device and a network control centre operates in any situation.
Depending on the application and the required maximum operation time, batteries
of 17 Ah or 24 Ah are normally used. Tests performed show an operation time of
about 36 hours for a 17 Ah battery and 60 hours for a 24 Ah battery at an ambient
temperature of +20 °C. The average consumption of the communication device
during the test was 200 mA.
A low temperature reduces the capacity of the batteries and the operate time. The
approximate maximum operate time versus temperature can be estimated as shown
in the following figure.