
4.4.3
Low auxiliary voltage indication
The power supply module gives an internal alarm signal when a drop in the power
supply voltage is detected (AC Fail). The indication of a low auxiliary voltage can be
reported to any available communication protocol supported by the device.
4.4.4
Over/undertemperature indication
The power supply module gives an internal alarm signal when over- or
undertemperature is detected inside the enclosure. The alarm is activated when the
temperature inside the enclosure surpasses a set limit or decreases below a set limit.
Hysteresis can be set for both indication functions. The indication can be reported
through any available communication protocol supported by the device.
4.4.5
Temperature compensation of battery charging voltage
The charging voltage of the internal battery charger of the device is temperature-
compensated. The compensation factor is approximately -40 mV/°C. The data about
the temperature is acquired with the help of a 2.2 kΩ NTC thermistor that is connected
to pins 3 and 5 of the connector X2.1. If the battery charger is not used to charge the
battery, the thermistor or the 2.2 kΩ resistor must still be installed between the pins 3
and 5 of the connector X2.1. Otherwise, the overvoltage protection of the charger may
activate and prevent the device from starting.
It is recommended to install NTC thermistor between the batteries.
4.4.6
Battery deep discharge protection
When the battery voltage falls below a certain value, the battery is almost empty. To
prevent battery damage, the battery should not be further discharged. The battery
deep-discharge protection function disconnects the battery from the device in two
cases.
•
AC supply is not available to charge the battery.
•
Battery voltage stays long enough below the defined limit.
Usually the deep-discharge protection causes the device to shut down due to lack of
power. The device recovers once the AC supply becomes available again or it is
powered up with DC on the modem-supply pin (X2.1 pin 6). External loads such as a
Hall sensor, additional DC-powered ARC600 devices or the supply for input circuits
should not be connected directly to the battery but to the “master” ARC600 24 VDC
In/Out pin (X2.1 pin 6). This way, the whole load can be removed at once when the
deep-discharge protection is required. The settings are defined in the section
[BATTERY_DISCHARGE_PROTECTION].
1MRS758459 C
Section 4
Functional description
ARC600
31
User Manual