Load Transfer: From Inverter Operation To Maintenance Bypass - ABB Conceptpower DPA 500 Operating Manual

6.9

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 AN
AGENT CERTIFIED BY THE MANUFACTURER.
WARNING!
Situation of UPS-System before starting the Transfer Procedure to Maintenance Bypass:
The load is protected by Conceptpower DPA 500 and 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 bypass. (this operation can be done on any module)
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
LINE 1
LINE 2
BYPASS
INVERTER
BATTERY
3. Press simultaneously the two ON/OFF buttons on the UPS-control panel (PMD) on all control
panels. On the LCD's message "LOAD OFF, SUPPLY FAILURE" will appear and the mimic
panel will show:
LED Indicator
LINE 1
LINE 2
BYPASS
INVERTER
BATTERY
4. Open Parallel Isolators IA2-1, IA2-2, IA2-3, IA2-4, IA2-5.
5. Open battery fuses/breakers on the internal (if any) and the external battery cabinets or racks.
THE UPS SYSTEM IS STILL POWERED (DANGEROUS VOLTAGE).
NOTE
THE LOAD IS NOW SUPPLIED BY MAINS AND IS THEREFORE NOT
PROTECTED THROUGH THE UPS.
NOTE
Modifications reserved
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