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LDX-U20
12 V / 24 V 20 A High Performance DC-UPS
3.4 BATTERY HEALTH MONITOR
The battery health monitor is composed of:
•
Internal resistance (Ri) measurement: The resistance is periodically measured. The internal resistance is a good indicator of the battery
health status; a sudden increase of the internal resistance indicates a potential problem on the battery or on the battery wiring (see §3.5).
•
Temperature (T) measurement: The battery temperature is monitored through an optional temperature sensor (P/N: WNTC-2MT). The
battery charger takes into account the battery temperature and provides a temperature compensated charging voltage. In case of over
temperature the system disconnects the battery to prevent damage.
•
Coulomb counter: It allows having a quick estimation of the remaining battery capacity and consequently the available backup time.
•
Deep discharge protection: It protects against the deep discharge of the battery which can lead to its irreversible damage.
3.5 BATTERY RESISTANCE MEASUREMENT
The battery internal resistance (Ri) is measured by injecting a defined AC current through a constant current source (CCS) in the battery and
measuring the AC voltage drop across the battery terminals. The principle is represented in Figure 7.
The injected AC current I(AC) is flowing also through the cables + connectors resistance - "Rcables".
Figure 6. PC shutdown settings
Figure 7. Internal resistance measurement
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