APC 20 - 200 KVA user manual Operation in on-line, Mode, Operation with the normal, 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		6
(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.
		2	4	5
Note:
In parallel MGE™ Galaxy™ PW		1
systems, the power drawn by the load
is equally shared between the different		2

1	4	5	A	B
			1
1
				D
2				C
			2

AB

1 Fig. 8

D

C

2

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.

8 - E-51028230XT/BG