Section-5
04-3006_S5_OPM_ABB_DPA_UPSCALE_RI_10-80kW_EN_150316.doc Page 5/14 ABB
Modifications reserved
5.1.3 Load Transfer: from Inverter operation to Maintenance 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 A AGENT CERTIFIED BY THE MANUFACTURER.
Situation of UPS-System before starting the Transfer Procedure to Maintenance Bypass:
The load is protected by DPA UPScale ST 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:
3. Press simultaneously 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:
4. Open battery fuses/breakers on the internal (if any) and the external battery cabinets or racks.
THE UPS SYSTEM IS STILL POWERED (DANGEROUS VOLTAGE).
THE LOAD IS NOW SUPPLIED BY MAINS AND IS THEREFORE NOT
PROTECTED THROUGH THE UPS.
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