APC 10-40kW 208/480V Installation Guide download pdf (Page 65)

65Installation Guide Silcon DP300E 208V/480V 10-80 kVA

7OY0002 US rev. 04

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8.2.7 Isolating one UPS for service/maintenance

In a redundant system one UPS can be isolated for service/maintenance without

affecting the other parallelled UPS(s).

1. Check that the remaining UPS(s) will be able to carry the load when one UPS is

isolated.

2. Switch off the system to be isolated for maintenance by pushing the red “OFF”

push-button.

3. Disconnect battery, mains, and output by opening battery MCCB and turning

input switch (Q001) and output switch (Q002) to position “0”.

When Q002 is in position “0” the UPS can be operated and tested as a single

system without affecting the other parallelled UPS(s).

Switching back the UPS to normal parallel/redundant operation

1. Turn the input switch (Q001) and the output switch (Q002) to position “1”.

2. Charge capacitors, connect battery and start up the UPS as described in chapter

5.0.

The UPS will automatically switch to normal operation and start load sharing

with the other parallelled UPS(s).

WARNING!

The system will discharge built-

in capacitors. However, before

working on the system check

with a multimeter that there is

no dangerous voltage on the

terminals .

DP300E

Q003

Service

bypass

switch

H003

Q001a

Q001b

Q002b

Q004

Q002a

LoadMains

H004

H002aH002b

Single Mains

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APC 10-40kW 208/480V Installation Guide Page 65