Stop/Start UPS and Operating the External Service Bypass
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.
Display shows
**System OFF**
**System OFF**
8. The acoustic alarm sounds | Blank |
*Reset the acoustic alarm by pressing 
.
The UPS is now isolated. Maintenance/repair, disconnection or removal can now be carried out.
CAUTION!
Recharge batteries out of service every 3 months to prevent damage.
WARNING!
Internal DC capacitor may contain energy even after the UPS has been switched off. Allow for automatic discharge by waiting at least 5 minutes after switching off UPS and battery breakers before working on the UPS.
6 | User Guide APC Silcon |