10
SunLight Series UPS User Manual
3.4.2 15-20-30 kVA
The PK1 switch acts as follows:
"0"
Off position (there is no Voltage at the UPS output)
"1"
Maintenance By-Pass (there is Line Voltage at the UPS output)
"2"
By-Pass (there is Line Voltage at the UPS output)
"3"
Normal (there is either Inverter or line Voltage at the UPS output)
1.
Position "0" : At this position , there is no AC voltage at the UPS output. But battery charger
board is active and hence the batteries are charged if battery fuse and AC input
circuit breaker on the front panel are closed.
2.
Position "1" : This is the "Maintenance By-Pass" position and at this position the load is supplied
by AC line voltage. Again at this position , only the battery charger is in operation.
3.
Position "2" : At this position the load is supplied by AC line voltage through both Maintenance By-
pass and Static By-pass acting in parallel manner. Battery charger and By-pass
drivers are in operation as well.
4.
Position "3" : When PK1 is turned to this position the Load is supplied again by line voltage at during
start-up and after a short delay , inverter starts running, (this can be seen by
observing the cooling fans rotation) and the load is transferred from By-pass to
inverter.
5.
Disconnect the input power. "LINE FAILURE" will appear on the LCD panel and audible alarm will
sound intermittently. Now the load is supplied from the battery source through the inverter.
6.
Connect the power again and see that "LINE FAILURE" alarm is off.
7.
Now your UPS is ready to operate. Connect the critical loads to the output terminals of the unit.
NOTE
If any condition is different from the above situation, call our local service representative for assistance.
CAUTION !
After initial start-up, keep power continuously to the unit for at least 12 hours to ensure that the batteries
are fully charged.
During battery charging, the inverter can be shut down by turning the On-Off Switch PK1 to " off - 0 "
position. In this case the main switch should be kept in " on-1 " position and it must be kept in mind that
there is line voltage at the output.
