6 User Guide APC Silcon 10-40kW 400V UPS
990-4043
Stop/Start UPS and Operating the External Service Bypass
2.3 Stop UPS (for complete power down) 2.3.1 Switching off the UPS
CAUTION!
If the UPS system is equipped with a Service Bypass Panel, and if the load must remain
energized by mains, refer to the Operating Service Bypass Panel sections in this guide before
proceeding
WARNING!
TEST BEFORE YOU TOUCH!
A special design feature switches the system into bypass operation in the event of internal power
supply failure or controller circuit failure to ensure uninterrupted output voltage.
Because of this special feature, the UPS may contain output voltage even when it is switched off.
1. Open front doors
2. Note that step 3 will interrupt output voltage and activate the alarm!
The red LED alarm below the display will light up
The acoustic alarm will sound for 30 seconds*
3. Press the green ON and the red OFF button simultaneously.
The red LED alarm below the display will light up
The acoustic alarm will sound for 30 seconds*
4. On systems with no Service Bypass Panel, switch off the mains
supply
5. The red LED alarm below the display will light up
The acoustic alarm will sound for 30 seconds
6. Switch off battery breakers F001 and F002 in the Battery Breaker
Box or battery cabinet
Refer to LED indication and labelling in Battery Breaker Box or
battery cabinet
7. To switch off mains supply, open Q001 – on systems with
Service Bypass Panel.
8. The acoustic alarm sounds
Display shows
**System OFF**
**System OFF**
Blank
*Reset the acoustic alarm by pressing .