APC SBP Installation Manual Page 22

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16 Smart-UPS
®
VT SBP with Power Distribution 10-30kVA, 208V, Installation Manual - 990-4198A
SBP Operation
The SBP with Power Distribution supports four (4) modes of UPS operation: 1) Normal, 2) Battery
Back-up, 3) Static Bypass, and 4) Bypass.
The process of changing from one operational mode to another requires a series of automated and
manual tasks. Automated tasks are initiated from the user interface at the front of the UPS and may
require switches on the SBP to be turned ON or OFF, depending on the operational mode. Refer also
to the Smart-UPS
®
VT 10-30kVA, 208V Operation Manual (p/n 990-1599).
A switch can be locked in place by pressing down on its red lever and then applying a locking device
to the exposed holes. The SBP is shipped with its switches in the OFF position (see below graphic).
Normal operating mode
To enter normal operating mode, first switch Q2 ON and then switch Q1 ON. Q3 remains OFF. The
heavier line shows the flow of utility power through Q1, the UPS, and Q2.
AC
Input
UPS
Static
Bypass
Load
Panel
Q1
UPS Input
Q3
Bypass
Q2
UPS Output
Input
Output
O OFF
I ON
O OFF
I ON
O OFF
I ON
AC
Input
UPS
Static
Bypass
Load
Panel
Q1
UPS Input
Q3
Bypass
Q2
UPS Output
Input
Output
O OFF
I ON
O OFF
I ON
O OFF
I ON
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