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Initial Start-up and Phase Check
990-1378
Installation Guide APC BC300 Series 10kW 208/450/480V UPS 35
DC Fuses
Figure 17
4.2 Initial Start-up and Phase Check (External Batteries)
1. Ensure that the external battery breaker for the battery system is set to “OFF”.
2. Open DC fuse holder (F001, F002, F003). For location of DC fuse holder, see Component
Overview illustration. Place the DC fuses in the fuse holder. Make sure that the red tab on
the fuse faces the top of the fuse holder. Make sure that the fuse locking tabs are aligned
in the slots on the fuse holder.
3. Press each fuse into place. The fuse will “click” into place when it is locked in correctly.
4. Using an open palm, close the fuse holder.
5. Turn the pre-charge/discharge switch to the “pre-charge” position and hold it until the LED
turns off.
6. Switch the battery breaker “ON”. The UPS display should show “System type xxkVA xxxV”.
7. Within 20 seconds, the display should show **Stand-by** and an audible alarm should
sound.
8. At utility input, switch on the input power to the Maintenance Bypass Panel.
9. At the Maintenance Bypass Panel, switch the UPS AC disconnect switch “ON”.
10. Check the phase rotation at the service panel and the unit. The unit will not start if the
phase rotation is incorrect. The phase rotation must be A, B, C and clockwise.
11. When the audible alarm stops, press the green “ON” button located inside the UPS front
door. The display will show “Normal operation load power xx%”.
Fuses seen from below
DC Fuse
Holder