Chapter 4 - Operating modes
UPStation GXT 3x1
Page 14
(06/02)
4.1.3
Bypass mode operation
During BYPASS operation, mains power provides energy to your load and maintains the batteries in a fully charged
state.
The BYPASS will automatically power the load temporarily during overloads of
the inverter, when diagnostics detect equipment problems, or when the operator
selects BYPASS operation. The four green LED’s indicate an approximate level
of load in 25% increments. If the BYPASS becomes loaded beyond full rating,
the fifth (amber) LED indicator will illuminate and sound an alarm.
The display template indicates the percentage of load on the output.
CAUTION:
The BYPASS power path does not protect the connected equipment
from disturbances on the mains supply.
4.1.4
Output off mode operation
The UPS output may be disabled even when mains or batteries are available. Output power may be enabled or disabled
using both the front panel controls or communication options. The UPS output may be disabled automatically when the
mains is absent for an extended time and batteries have been discharged. When the UPS is standing by in this mode with
the mains power absent, all panel LEDs and cooling fans will turn off. Output power will be restored automatically upon
restoration of mains.
CAUTION:
The UPS and loads are not isolated from hazardous voltages in this mode and output power could be
restored at any time. Follow instructions for powering down the UPS and fully isolating the equipment for maintenance.
4.1.5
Manual operation with mains available
Under normal circumstances, the UPS will be operated with mains available.
The UPS can operate in three possible modes with mains available:
•
NORMAL MODE OPERATION - UPS ON LED will be on and the inverter will provide power to the load.
•
BYPASS MODE OPERATION - BYPASS LED will be on and the bypass will provide power to the load
directly from the mains.
•
OUTPUT OFF MODE OPERATION - UPS ON and BYPASS LEDs will be off and the load will not have
power. AC LINE LED will be on and batteries will recharge.
4.1.6
Starting the UPS with mains available
1
Ensure the load equipment is turned off, and all loads are proper1y connected to the UPS output.
2
Verify that the mains supplying the UPS is turned on by closing any circuit breaker or switch on the supply side
of the UPS.
3
Turn On (Close) the BATTERY circuit breaker.
4
Turn ON (Close) the INPUT and OUTPUT circuit breakers. After a start-up sequence, the AC INPUT LED
should be on. If this LED is not on, verify that the mains is turned on to the UPS from any external distribution
panel or isolating switch.
5
After about 10 seconds, the UPS will automatically default to BYPASS MODE OPERATION. The BYPASS
LED should be on. The load will now receive power, but is not protected from disturbances in the mains.
6
Press the UPS ON/ALARM/BATTERY TEST button for at least one second until you hear the audible alarm
"beep" to signal acceptance of the command. After a delay of about 10 seconds, the BYPASS LED will
extinguish, and the UPS ON LED should light The UPS will then initiate a self-test and battery test When these
tests are complete, the UPS is ready for NORMAL UPS OPERATION.
7
Confirm that the UPS ON and AC INPUT LEDs are on and the BATTERY and BYPASS LEDs are off.
8
Connected load equipment may now be turned on.
Figure 4-3
Bypass Mode Operation at
51-75% loading
