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REC 523
5.2.5.
5.2.6.
28
Remote Monitoring and Control Unit
Technical Reference Manual
Charging voltage / V
32
30
28
26
24
-60
-40
-20
Fig. 5.2.4.-1
Charging voltage versus temperature
Deep-discharge protection
The charger also protects the batteries against deep-discharge during long periods of
outages. It switches the power supply to stand-by mode as soon as the battery
voltage drops below 19 V. The power supply is switched on again when the auxiliary
voltage returns. After this, the batteries are charged at an interval of 1 second until
the battery voltage exceeds 22 V.
Low auxiliary voltage indication
The REC 523 is provided with a low auxiliary voltage indication feature. The power
supply module issues an internal alarm signal when a drop in the power supply
voltage is detected (ACFail, active low).
The indication of a low auxiliary voltage (ACFail) is available in REC configuration
environment and can be connected to any signal output of the REC 523 device. The
auxiliary voltage indication in the REC configuration is as follows:
• REC 523: PSC_7_ACFail
Overtemperature indication
The REC 523 includes an internal temperature supervision function. The power
supply module gives an internal alarm signal when overtemperature has been
detected inside the enclosure. The alarm signal is activated when the temperature
inside the enclosure increases to +78
0
20
Temperature / °C
o
o
C (+75...+83
C).
1MRS750881-MUM
40
60
80
A050002
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