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THE UPS MAY BE SHUT DOWN COMPLETELY IF THE LOADS DO NOT NEED ANY POWER
SUPPLY. THEREFORE THE STEPS IN THIS PARAGRAPH ARE TO BE PERFORMED ONLY AFTER
THE LOAD HAS BEEN DISCONNECTED AND DOES NOT NEED ANY POWER SUPPLY.
7.9
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 BY AN AGENT CERTIFIED BY THE
MANUFACTURER.
WARNING!
Configuration 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).
Using LCD panel, select the COMMANDS menu and choose command "LOAD TO BYPASS" and transfer the load to
1.
mains.
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
Press simultaneously the two ON/OFF buttons on the UPS module control panel on all control panels. On the LCD's
3.
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 CB1-1, CB1-2, CB1-3, CB1-4, CB1-5 (depending on the number of UPS cabinets).
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).
THE LOAD IS NOW SUPPLIED BY MAINS AND IS THEREFORE NOT PROTECTED THROUGH THE
UPS.
7.10 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).
Configuration of UPS-System before starting the Transfer Procedure to ON-LINE mode:
48 Conceptpower DPA 500 480V UL │94-12-043275 A02
Color
Green
Green
Green
RED
Green
Color
Green
OFF
OFF
OFF
Flashing Green
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