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Digital Energy™ GT Series

3.3.4Silencing the buzzer

When the UPS is in ‘ON BATTERY’ mode the buzzer can be turned on or off by pressing the ‘I/TEST’-button (1).

3.3.5Switching off

1To switch off the UPS push the OFF -button (2) until a short beep is heard. Release the button after the beep. After a few seconds the UPS will be in ‘STANDBY’ mode: it will continue keeping the batteries charged. See also fig. 2.5.

2To fully turn off the UPS, and/or if electric isolation is required, unplug the power cord of the UPS from the wall outlet.

3.4Use: Abnormal Conditions

3.4.1On battery

In case of a utility power failure the UPS will use the energy stored in the battery to

supply the load.

The LED ‘On Battery’ will light and the buzzer beeps with a 2 seconds interval. When the utility power returns, the UPS will switch back to normal operation. In case of a long power failure the UPS will stop operating when the batteries have been depleted (see Chapter 8 - Battery - Back-up Time).

Fig. 3.6 On battery

3.4.2Battery low

The batteries are nearly discharged during battery operation (see 3.4.1).

The LED ‘On Battery’ and the ‘Battery Low’

LED will light and the buzzer beeps with a

1.5seconds interval, Controlled shutdown of any computer equipment is absolutely necessary at this point

Fig. 3.7 Battery low

3.4.3Overload

The demanded power exceeds the normal capacity of the UPS.

The Overload LED will light and the buzzer sounds continuously.

You are advised to unplug some load as soon as possible. If an overload condition persists, the UPS may eventually switch to bypass operation. If this is not possible (UPS was operating on battery during utility failure, bypass is not available) the UPS output power may be lost.

Fig. 3.8 Overload

OPM_GTU_TWR_1K0_3K0_XUS_V015

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DE GT Series: User manual rev date 8-11- 04