Section-5
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5.1.4
LOAD TRANSFER: FROM MAINTENANCE BYPASS TO INVERTER OPERATIONS
This procedure describes the sequence of operations to be done in order to restart the UPS and restore ON-LINE
mode (Load on Inverter).
WARNING!
THE OPERATIONS DESCRIBED IN THIS CHAPTER MUST BE PERFORMED BY A
SERVICE ENGINEER FROM THE MANUFACTURER OR FROM A AGENT
AUTHORIZED BY THE MANUFACTURER.
Situation of UPS-System before starting the Transfer Procedure to ON-LINE mode:
The load is supplied directly by Input Mains power and the UPS is OFF.
1.
Close battery fuses/breakers in the external battery cabinets or racks.
2.
On the LCD’s: “LOAD OFF, SUPPLY FAILURE” will appear and the mimic panel will show:
LED Indicator
Colour
LINE 1
Green
LINE 2
OFF
BYPASS OFF
INVERTER OFF
BATTERY Flashing/Green
3.
Close all Parallel Isolators IA2 and check message “PARALLEL SW CLOSED” on LCD of each UPS.
4.
Press simultaneously the two ON/OFF buttons on the UPS-control panel (PMD).
Unit will start-up and after about 60 seconds the mimic panel will show:
LED Indicator
Colour
LINE 1
Green
LINE 2
Green
BYPASS Green
INVERTER RED
BATTERY Green
5.
Make sure that the bypass LED is green, then open the Maintenance Bypass Switch IA1 of each unit
(position OFF).
6.
Using LCD panel, select the COMMANDS menu and choose command “LOAD TO INVERTER” (for
parallel operation is enough to give the order in one of the units). This will transfer the LOAD to
Inverter on the complete system (all units). On LCD panel “LOAD PROTECTED” will appear.
THE LOAD IS NOW SUPPLIED BY INVERTER POWER AND IS PROTECTED
