Comba Telecom. All Rights
568 Gibraltar Dr., Milpitas, CA 95035| +1 866 802 7961 | www.combausa.com
8
Rev 1.11 – 01-21-2021
o Cut off: Either (1) battery voltage is lower than the Cut Off Threshold so they have been cut
off from the system to ensure they can still be recharged, or (2) batteries have not properly
charged, leading to the BBU to cut them off to ensure no battery or system damage occurs.
The unit might ship with the batteries in cut off status due to no batteries connected during
factory firmware flash.
Refer to Setting page: <Cut Off TH>
o No battery: Battery is not connected
- Battery Voltage:
o The voltage of the batteries
- Alarm Status:
o Refer to Appendix - Alarm section
Settings:
NOTE: After setting up a new unit or upgrading the firmware, always verify that all the
parameters in this page are set to default values; always contact Comba technical support
PRIOR to changing any of the parameters
- Low Voltage TH: default = 47.3V
o Define the minimum percentage the battery capacity (e.g. 30%), and the <Battery
Low> alarm will be triggered when the remaining battery capacity reaches 30%
- Cut Off TH: default = 44V
o Battery supply to the loads will be cut off if the battery voltage is lower than the
desired threshold; the charger will try to charge the batteries when AC is restored,
but it is not guaranteed that the batteries can be charged if the batteries are over-
discharged to the point of being damaged.
- Over Temperature TH: default = 50degC
o Over temperature alarm threshold
- Battery Connection Detection: The system will check once during each 24-hour period to
verify that all batteries are connected.
- Panel NO: See Annunciator Panel Manual.
NOTE 1: IF THE BBU DOES NOT SEE A LOAD (i.e., the BDA or fiber DAS devices is powered
down, or has been removed for some reason), the Battery Connection Detection alarm may
trigger. To prevent this, we recommend disabling the Battery Connection Detection alarm
until the BDA or fiber DAS device has been powered up or has been re-installed.
