User manual

Liebert GXTRT Series Installation and User Manual
1-3 kVA UPS
Page 20 9/2005 Emerson Network Power
O
p
eration
3.2 Operation Mode
The UPS can be considered to be in the following operation modes:
Normal mode
When the input mains voltage is within the specifications, the load is supplied by the inverter,
which draws power from the rectifier; meanwhile, the charger charges the battery. When in
Normal mode, the LINE indicator and INVERTER indicator on the operator panel are on.
Bypass mode
In the event of an overload, inverter fault, overheating or rectifier fault condition during Normal
mode, the UPS will transfer to Bypass mode. In Bypass mode, the load is supplied by the
bypass AC source, which comes directly from the AC mains input; meanwhile, the charger
charges the battery. When the UPS works in Bypass mode, the LINE indicator and BYPASS
indicator are on, the INVERTER indicator is off.
 Note
1. If the UPS transfers from Normal mode to Bypass mode three times within twenty minutes
due to overload, it will remain in Bypass mode afterwards whether the overload condition is
removed or not.
2. In the event of a mains failure or mains voltage/frequency outside the specifications when
the UPS is in Bypass mode, the UPS will shut down and cease supplying power to the load.
Battery mode
In the event of a mains failure or mains voltage/frequency outside the specifications when the
UPS is in Normal mode, the rectifier and charger will become inoperative and the battery will
begin to discharge and supply the load through the inverter. When the UPS is in Battery mode,
the BATTERY indicator and the INVERTER indicator are on.
 Note
In the event of an inverter fault, internal overheating or other fault conditions in Battery mode,
the inverter will become inoperative.
3.3 Operating Instructions
3.3.1 Turning On And Completely Powering Down The UPS
 Note
The battery is fully charged before delivery. However, storage and transportation will inevitably
cause some charge loss. Therefore, it is advisable to charge the battery for 8 hours before
using it, so as to ensure adequate battery autonomy.
Turning on the UPS
Users can use the following two methods to turn on the UPS:
1. Connect the mains input to the UPS, and manually turn on the UPS into Normal mode
Connect the mains input to the UPS, press and hold the ON button for one second until the
buzzer beeps. At this point, the UPS begins to conduct self-test. Seconds later, the UPS will