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APC SBP Installation Manual Page 24

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SBP Operation
18 Smart-UPS
®
VT SBP with Power Distribution 10-30kVA, 208V, Installation Manual - 990-4198A
Bypass operation
Bypass operation allows the UPS to be serviced while the load is still being supported by the utility.
Returning to normal operation
To return to normal operation from bypass operation, the UPS must first be placed in static bypass
mode.
Note
To achieve bypass operation after attaining static bypass mode, the following
actions must take place at the SBP: 1) Switch Q3 ON, 2) Switch Q2 OFF, and
3) Switch Q1 OFF.
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
Note
• The user interface on the UPS initiates static bypass mode (graphic A) during
transfer from bypass operation to normal operation. The following actions must
take place at the SBP: 1) Switch Q2 ON, and 2) Switch Q1 ON.
• To achieve normal operation (graphic B) after attaining static bypass, Switch
Q3 OFF.
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
A
B
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