Same problem is happening with our UPS when a commercial power interruptions occurs. after 2 or 3 minutes UPS display monitor will indicate "batt must be check" and alarm continues to buzz on even though the battery is still 96% charge. alarm and status problem is gone after we reset the system. battery usage 2yrs.
The internal automatic battery test is picking up some differences between the actual value of the battery to the mathematical calculation used in the software. Normally if you do a battery impedance test you would find that the batteries would be consistent and therefore replacing the batteries may not be the solution. Once you transfer the UPS on BYPASS and then recycle the power you would clear the alarm. However on the next internal automatic battery you would be getting the same alarm again.
At times this may be a software issue or an SNMP problem. Normally to refresh the battery data for the UPS monitoring software we carry out a battery discharge test. Please consult with the supplier if an annually battery discharge test is mandatory for the battery monitoring circuit to work well. Please let me know of the outcome
8.3 Battery Configurations
There are different configurations for different battery types and backup time. Here, the batteries from VISION and
YUASA are selected. The backup times ranges from 1hours to 4hours for 20KVA UPS and from 1hours to 2hours
for 30KVA UPS, because of limitation of CLA power rating.
UPS Backup
time Number of blocks Type of blocks Capacity(10H)
1h 1Ć24 6FM55SGX 52Ah
10kVA 2h 2Ć24 6FM45X 2Ć42Ah
4h 2Ć25 6FM75X 2Ć74.5Ah
1h 24 6FM75X 74.5Ah
15kVA 2h 3Ć24 6FM45X 3Ć42Ah
4h 3Ć25 6FM75X 3Ć74.5Ah
1h 1Ć25 6FM90X 90Ah
20kVA 2h 3Ć25 6FM55X 3Ć52Ah
4h 2Ć26 6FM150X 2Ć144h
1h 2Ć25 6FM75X 2Ć74.5Ah
30kVA
2h 3Ć24 6FM100X 3Ć96Ah
Sheet. 4 the battery configuration with VISION battery
UPS Backup time Number of
blocks Type of blocks Capacity
(10H)
1h 2X24 NPL24-12 2X24AH
10kVA 2h 2Ć26 NPL38-12 2Ć35.3AH
4h 2Ć26 NPL65-12 2Ć60.5Ah
1h 1Ć27 NPL65-12 60.5Ah
15kVA 2h 2Ć24 NPL65-12 2Ć60.5Ah
4h 3Ć26 NPL65-12 3Ć60.5Ah
1h 1Ć27 NPL100-12 92Ah
20kVA 2h 2Ć24 NPL100-12 2Ć92Ah
4h 4Ć26 NPL65-12 4Ć60.5h
1h 3X24 NPL65-12 3Ć60.5Ah
30kVA
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