ELTEX SMG-4 - RTC Battery Replacement

22 SMG digital gateway
2.3 RTC Battery Replacement
RTC (an electric circuit designed for independent chronometric data metering—current time, date, day of
the week, etc.) installed on the device plate has a battery with the following specifications:
Battery type
Lithium
Form-factor
CR2032 (CR2024 option is possible)
Voltage
3 V
Capacity
225 mA
Diameter
20 mm
Thickness
3.2 mm
Battery life / expiration date
5 years
Storage conditions
-20 to +35 °С
Fig. 2.2—Battery Location in RTC
If battery life is expired, replace the battery with a new one to ensure correct and continuous operation of
the equipment. The replacement procedure is as follows:
1. Check if the device is energised.
2. If the voltage is present, disconnect the power supply.
3. Open the device casing (see section 2.2 Opening the Casing).
4. Remove the exhausted battery from the reverse side of the plate (Fig. 17) and install a new one in
the same position.
To assemble the device, repeat all the steps above in the reverse order.
If NTP synchronisation is disabled, the system date and time will require adjustment after
RTC battery replacement.
Used batteries should be recycled according to requirements.