MGE UPS Systems GALAXY PW 100, Installation And User Manual, Page: 53 / 104

Installation and User Manual
4.3 Operation with the Normal AC Source Restored
When normal AC source power (1) is restored or its voltage returns to within specified tolerances, the system
automatically returns to its normal operating mode described above (on the condition it did not reach the end of
battery power). If the end of battery power was reached (with the resulting inverter shutdown), the rectifier/charger
(A) restarts automatically, but the inverter (B) must be restarted manually.
The rectifier/charger recharges the battery (D) which was discharged during the mains outage. During battery
charging, light 2 flashes green.
The message "BATTERY CHARGING" is displayed, together with the value of the recharging current and battery voltage.
Figure 4-7: Normal Operation Mode Indicator Diagram.
The battery charge cycle takes place in two steps: See Figure 4-8.
step 1: the battery is recharged at a constant current limited to 0.1C10 (i.e. 1/10th of the battery capacity specified
for a 10 hour discharge). The DC voltage increases with the battery charge until the charge level is reached.
step 2: the battery is recharged at constant voltage equal to the charge level. The charging current gradually
decreases until reaching a specified low value (floating current).
For vented lead-acid batteries, the rectifier/charger supplies the charging voltage for 0 to 255 hours (parameter
defined by the after-sales support department) and then the floating voltage. For sealed lead-acid batteries, the
charging and floating voltages are the same.
NOTE If the normal AC source failure is shorter than 0 to 255 seconds (default value = 30
seconds) (parameter defined by after-sales support department), the charger
automatically supplies the floating voltage given the low battery discharge.
1
2
AB
C
D
2
1
4 5 2 1
Operation 4 — 5 86-133060-00 A00