Apc SILCON 990-4053 User Manual download pdf (Page 54)

54 Installation Guide APC Silcon 480kW 400V UPS

990-4053

Options/Accessories

6.2.4 Isolating One UPS for Service/Maintenance

In a redundant system, one UPS may be isolated for service/maintenance without affecting

other UPSs.

1. Check that remaining UPS(s) is capable of carrying the load in the event that one UPS is isolated

2. Switch off system to be isolated for maintenance purposes by pushing green “ON” and red

“OFF” buttons simultaneously

3. To disconnect battery, mains and output, open battery MCCB/fuse and set input switch (Q001)

and output switch (Q002) to position “0”

With Q002 in position “0”, UPS will be operational and may be tested as a single system

without affecting other parallel UPS(s).

The following can be carried out on any UPS

13. Press on the keyboard

14 Press or on the keyboard until

15. Press on the keyboard

16. Press on the keyboard

All the systems will transfer to normal operation.

Normal operation

load power xx%

Display shows

Bypass operation

:NO

Bypass operation

:YES

No lamps on the bypass

panel lights any longer

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Apc SILCON 990-4053 User Manual Page 54