Load Transfer: From Inverter Operation To Maintenance Bypass - ABB PowerWave 33 Series 3 User Manual

The load may be disconnected by means of the two ON/OFF (LOAD-OFF) buttons for security
reasons.
Complete Shutdown procedure of POWERWAVE 33:
Only in case there is no need to supply the load, the UPS System can be completely shutdown. The
following procedures can only be executed after the load has completely been de-energized.
IN THE CASE THAT THE PARALLEL UPS SYSTEM HAS TO BE TURNED
OFF, THEN BOTH ON/OFF BUTTONS ON ALL UPS MODULES HAVE TO BE
PUSHED. ONLY IN THIS CASE THE POWER SUPPLY TO THE LOAD WILL
BE INTERRUPTED.
NOTE
1. Verify that the loads are shutdown and that there is no need for power supply to the
load.
2. If the loads are all disconnected, press simultaneously both ON/OFF-Buttons on UPS-
Control Panel.
On the LCD: "LOAD OFF, SUPPLY FAILURE" will appear and the LED-indicator will
indicate as shown below:
LED Indicator
LINE 1
LINE 2
BYPASS
INVERTER
BATTERY
3. Open all Parallel Isolator Switches IA2.
4. Open battery fuses/breakers on external battery cabinets or racks.
5. Open the Input Switch (IA4) and Bypass Switch (IA3)
6. Open the main fuses/breaker in the building distribution panel.
MAKE SURE THE INTERNAL DC-CAPACITORS (ELCO) HAVE BEEN
DISCHARGED WAITING AT LEAST 10 MINUTES..
NOTE
THE POWERWAVE 33 IS NOW VOLTAGE FREE.

6.5.3 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 AN
AGENT CERTIFIED BY THE MANUFACTURER.
WARNING!
Modifications reserved
Page 39/50
Colour
Green
OFF
OFF
OFF
Green