MGE UPS Systems Galaxy PW user manual Operation in on-line mode, Normal operation, Battery time

Galaxy PWTM 100 to 225 kVA

operation in on-line mode

normal operation

Normal AC source power is available (see figure 5).

■lights 1 , 4 and 5 shine green on the control panel;

■the power necessary for the load is pro- vided by the normal AC source (1) through the rectifier/charger (A) and the inverter

(B);

■the rectifier/charger (A) also supplies the power to float charge and recharge the battery if any.

The rectifier/charger output voltage (DC) is regulated to supply:

❏ the float-charging or the recharging volt- age for vented lead-acid or Ni/Cd batter- ies,

❏ a single charge voltage for sealed lead- acid batteries.

The voltages depend on the number of battery cells and the battery manufacturer. Factory set, they may also be adjusted by after-sales support technicians.

An electronic board continuously mea- sures the battery temperature and auto- matically adjusts the voltages.

Note:

In parallel Galaxy PW™ systems, the power drawn by the load is equally shared between the different units.

1	4	5
1
2
A	B
1
	D
	C
2

Fig. 5

operation with the normal AC source down

See figure 6.

In the event of a normal AC source failure or voltage outside specified tolerances of ±10% in amplitude (±15% optionally), the rectifier/charger (A) stops and the battery

(D)supplies the necessary backup power to the load via the inverter (B). The bat- tery, float-connected between the rectifi- er/charger and the inverter, discharges during this operating mode.

Lights 2 , 4 and 5 shine green.

The user is warned of battery operation by the slow beeping of the buzzer 6 (see figure 16) and the message "LOAD PRO- TECTED, BATTERY DISCHARGING", fol- lowed by the remaining backup time and the percent load.

This information is also available via volt- free changeover contacts for remote con- trol devices.

2	4	5
1
2
A	B
1
	D
	C
2

Fig. 6

battery time

The available battery time during a normal AC source outage depends on the:

■rated capacity of the battery;

■power consumed by the load;

■temperature of the battery;

■age of the battery.

The specified battery time corresponds to a minimum duration at full rated load. The actual backup time can therefore be greater if the system operates below its full rated load during the normal AC source outage. Operation on battery power can be extended beyond the speci- fied time by reducing the load power con- sumption (by disconnecting non-critical loads).

A "low battery" warning signal is sent via volt-free changeover contacts for remote control devices when the battery voltage reaches a level slightly above the mini- mum level. This signal warns the user of the imminent end of battery power. On the device itself, the buzzer beeps rapidly. The message "LOW-BATTERY SHUT- DOWN WARNING" is displayed, followed by the remaining backup time and the per- cent load. Light 2 turns red and flashes. Battery power stops when the voltage supplied by the battery reaches the mini- mum threshold. This results in inverter shutdown and transfer of the load without interruption to the bypass AC source. Light

2shines red (not flashing). The mes- sage "LOAD NOT PROTECTED, ON- LINE MODE" is displayed and the buzzer sounds continuously.

If the bypass AC source also fails, the load is no longer supplied. The inverter automatically shuts down when the time on battery power exceeds three times the specified backup time.

NOTE

The "low battery shut- down" warning signal can be sent with an adjustable time delay prior to the effective end of battery power.

6 Introduction