ABB DPA UPScale ST40, User Manual

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7.3.2 From bypass to inverter
This procedure describes the sequence of operations 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 AN
AGENT CERTIFIED BY THE MANUFACTURER
Status of the UPS system before starting the transfer 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 Color
LINE 1 Green
LINE 2 OFF
BYPASS OFF
INVERTER OFF
BATTERY Flashing/Green
3. Simultaneously press the two ON/OFF buttons on the UPS control panel (PMD) on all control
panels of the modules.
The unit will start up and after about 60 seconds the mimic panel will show:
LED Indicator Color
LINE 1 Green
LINE 2 Green
BYPASS Green
INVERTER RED
BATTERY Green
4. Make sure that the bypass LED is green, then open the maintenance bypass switch IA1
(position OFF).
5. Using LCD panel, select the COMMANDS menu and choose command “LOAD TO
INVERTER”. 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