Modifications reserved
7.3 Manual bypass
7.3.1 From invert to bypass
If it is necessary to perform service or maintenance on the UPS it is possible to transfer the UPS to
MAINTENANCE BYPASS.
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 maintenance bypass:
The load is protected by the DPA UPScale ST S2 running in normal operation. (The UPS module is
operating on inverter)
1. Using LCD panel, select the COMMANDS menu and choose command “LOAD TO BYPASS”
and transfer the load to mains on control panel of any one of the UPS-modules
On LCD panel “LOAD NOT PROTECTED” will appear.
2. Close maintenance bypass switch IA1 (position ON).
On LCD: “MANUAL BYP IS CLOSED” will appear and the mimic panel will show:
LED Indicator Colour
LINE 1 Green
LINE 2 Green
BYPASS Green
INVERTER RED
BATTERY Green
3. Simultaneously press the two ON/OFF buttons on the UPS control panel (PMD) on all control
panels on the modules.
On the LCD’s message “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
4. Open battery fuses/breakers on the internal (if any) and the external battery cabinets or racks.
THE UPS IS STILL POWERED (DANGEROUS VOLTAGE)
THE LOAD IS NOW SUPPLIED BY MAINS AND IS THEREFORE NOT
PROTECTED THROUGH THE UPS.
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