Stop/Start UPS and Operating the External Service Bypass
990-4036
User Guide APC Silcon 120-160kW 400V UPS 7
The UPS is now isolated. Maintenance/repair, disconnection or removal can now be carried out.
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 .
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.