Load Transfer: From Inverter Operation To Maintenance Bypass - ABB PowerScale CABINET A User Manual

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.
WARNING!
Situation of UPS-System before starting the Transfer Procedure to Maintenance Bypass:
The load is protected by PowerScale running in normal operation. (The UPS is operating on inverter).
Using LCD panel, select the COMMANDS menu, choose command "LOAD TO BYPASS" and
1.
transfer the load to mains. (for parallel operation is enough to give the order in one of the units)
On LCD panel "LOAD NOT PROTECTED" will appear.
2. Close Maintenance Bypass Switch IA1 (position ON). (for parallel operation close all IA1)
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 the Parallel Isolators IA2 on all UPSs
5. Open battery fuses/breakers on the external battery cabinets or racks.
!
NOTE!
!
NOTE!
THE OPERATIONS DESCRIBED IN THIS CHAPTER MUST BE PERFORMED BY A
SERVICE ENGINEER FROM THE MANUFACTURER OR FROM A AGENT
CERTIFIED BY THE MANUFACTURER.
Colour
Green
Green
Green
RED
Green
Colour
Green
OFF
OFF
OFF
Flashing Green
THE UPS SYSTEM IS STILL POWERED (DANGEROUS VOLTAGE).
THE LOAD IS NOW SUPPLIED BY MAINS AND IS THEREFORE NOT
PROTECTED THROUGH THE UPS
04-3004_S5_OPM_ABB_POWERSCALE_10-50kVA_EN_150113.doc
Printed in Switzerland – Modifications reserved
Section-5
Page 5/6 ABB