MGE UPS Systems Galaxy PW user manual User’s Manual Operation with the normal AC source restored

User’s Manual

operation with the normal AC source restored

See figure 7.

When normal AC source power (1) is restored or its voltage returns to within specified tolerances, the system automati- cally 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 rectifi- er/charger (A) restarts automatically, but the inverter (B) must be restarted manual- ly.

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

The battery charge cycle takes place in two steps (see figure 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 con- stant voltage equal to the charge level. The charging current gradually decreases until reaching a specified low value (float- ing current).

For vented lead-acid batteries, the rectifi- er/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 sup- port department), the charger automatically sup- plies the floating voltage given the low battery dis- charge.

recharging current and battery voltage.

1	2	4	5
1
2
	A	B
1
		D
		C
2

Fig. 7

Battery charge cycle

U/I	voltage	U charge/floating
		(sealed batteries)
		U "floating"
		(vented batteries)
	0,1 C10
	current
current	constant voltage	t
limiting	decreasing current

Fig. 8

Introduction 7