Kipp&Zonen 2AP Sun Tracker - Manual (Page 16)

INSTALLATION AND SETUP
15
Important: Memory back-up battery
A memory back-up battery is installed on the 2AP controller board. The function of the back-up
battery is to keep the specific 2AP configuration parameters stored in the controller board and to
power the high accuracy internal clock when the 2AP is disconnected from the mains voltage or
during a temporary power cut.
The system does not draw power from the memory back-up battery, when the 2AP is connected to
the power supply.
The battery life time depends on the use of the 2AP. When the 2AP is constantly powered the
battery will function for about 15 years, if the power to the 2AP is turned off the battery life time is
about 6 months.
It is important to have a working back-up battery installed to avoid loss of time and the configuration
settings stored in the 2AP. When the power is turned on again e.g. after a power cut the 2AP will
automatically resume its assigned tasks, as the 2AP can rely on the internal clock time and
configuration settings.
The battery type is Lithium ½ AA, 3.6V, 0.8Ah, non-rechargeable with axial wire terminals soldered
to the controller board. When the battery is ready for replacement the controller board can be taken
out from the 2AP for easy access and re-soldering. Ensure to have downloaded the latest
configuration parameters from the 2AP to the PC before removing the old battery from the controller
board. See section 5.4 on how to download the configuration parameters from the 2AP. Reload the
configuration files when the new back-up battery is installed. The time can be reset by using the
“Set Time” item from the 2AP pull down menu in the Run Suntracker or Run Positioner monitor
window.
Figure 3.6: Location of the Memory Back-up Battery.
Memory Back-up Battery:
- Lithium, ½ AA, 3.6V, 0.8Ah
- With axial wire terminals to be
soldered to the controller board
- Non-rechargeable
- Size: length 23 mm,
∅ 14 mm