Operation in on-line, Mode, Battery time

Introduction (cont.)

Operation in on-line

units.

Operation with the normal

mode

AC source down

Normal operation

See figure 8.

Normal AC source

power is available

In the event of a normal AC source

failure or voltage outside specified

(see figure 7).

tolerances of ±10% in amplitude (±15%

◗ lights 1 , 4 and

5 shine green on

optionally), the rectifier/charger (A)

the control panel;

stops and the battery (D) supplies the

◗ the power necessary for the load is

necessary backup power to the load via

provided by the normal AC source (1)

the inverter (B). The battery, float-

through the rectifier/charger (A) and the

connected between the rectifier/charger

inverter (B);

and the inverter, discharges during this

◗ the rectifier/charger (A) also supplies

operating mode.

the power to float charge and recharge

Lights 2 , 4 and

5 shine green.

the battery if any.

The user is warned of battery operation

The rectifier/charger output voltage

by the slow beeping of the buzzer

(DC) is regulated to supply:

(see figure 19) and the message

◗ the float-charging or the recharging

"LOAD PROTECTED, BATTERY

voltage for vented lead-acid or Ni/Cd

DISCHARGING", followed by the

batteries,

remaining backup time and the percent

◗ a single charge voltage for sealed

load.

lead-acid batteries.

This information is also available via

The voltages depend on the number of

volt-free changeover contacts for

remote control devices.

battery cells and the battery

manufacturer. Factory set, they may

Note:

also be adjusted by after-sales support

In the event of a normal AC source

technicians.

failure, frequency converters without a

An electronic board continuously

battery shut down and the load is no

measures the battery temperature and

automatically adjusts the voltages.

Note:

In parallel MGE™ Galaxy™ PW

systems, the power drawn by the load

is equally shared between the different

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

Fig. 8

Fig. 7

longer supplied.

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 specified time by reducing the load power consumption (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 minimum 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 SHUTDOWN WARNING" is displayed, followed by the remaining backup time and the percent load. Light 2 turns red and flashes.

Battery power stops when the voltage supplied by the battery reaches the minimum threshold (335 V). This results in inverter shutdown and transfer of the load without interruption to the bypass AC source. Light 2 shines red (not flashing). The message

"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 shutdown" warning signal can be sent with an adjustable time delay prior to the effective end of battery power.

APC 20 - 200 KVA user manual Operation in on-line, Mode, Operation with the normal, Battery time

Introduction (cont.)