2.4.2 After the UPS starts up, verify that all three LED indicators on the front
panel are illuminated.
2.4.3 Turn on the battery circuit breaker (handle in the up position). The
characteristic sound of the main transformer in the UPS may change somewhat
due to charging of the battery system.
2.4.4 Connect the load(s) to the UPS output.
2.5 Continuous Operation
It is recommended that the unit be left on all the time. This will insure that the
battery remain charged to it full capacity. The unit is designed to operate 24
hours per day and is not required that it be turned off during the week-ends
2.6 Shut Down Procedure
2.6.1 Disconnect the load from the UPS.
2.6.2 Disconnect the commercial AC source from the UPS.
2.6.3 Press the BATTERY OFF push-button switch on the front panel to turn off
the UPS.
2.6.4 Turn off the BATTERY CIRCUIT BREAKER (handle in the down
position) to prevent further discharge of the battery.
2.6.5 If servicing of the UPS or the battery is required, disconnect the battery
cable at the battery before performing any maintenance.
3. DESCRIPTION OF OPERATION
3.1
General Operation
Figures 3.1 and 3.2 illustrate the operation of this system. Please note that
under normal operation (Figure 3.1), the AC input operates through the inverter
and is then further regulated and filtered. The output of the unit is a very clean
sinewave with an output voltage that is regulated to 3% with an input
voltage swing of + 10% and -15%. During this operation, a special inverter
circuit provides trickle charge to the battery.
During standby operation when the commercial line is not present, the inverter
is switched totally to the battery which converts the battery’s DC voltage to AC
and supplies power to the regulator/filter. The output is then the same as if the
line were present. Transfer from a charger to inverter is done within
microseconds and no power interruption occurs at the output.
4
Summary of Contents for 9300057
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