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APC Smart-UPS VT Installation Manual Page 36

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Operation
30 Smart-UPS
®
VT Maintenance Bypass Panel w Power Distribution, 10-30kVA, 208V - 990-4199B
Bypass operation
Bypass operation allows the UPS to be serviced while the load is still being supported by the utility.
The heavier line in the graphic shows the flow of utility power when the UPS is in bypass operation.
To achieve bypass operation from normal operation:
1. Transfer the UPS into static bypass mode using the UPS user interface. Follow the procedure
described in the Smart-UPS VT 10-30kVA Operation Manual (p/n 990-1599).
Warning
WARNING!
Be sure to address the MBP switches (steps 2-4 below) in the EXACT order
specified in this procedure. Q3 MUST be switched ON before Q2 is switched OFF.
Addressing the MBP switches in the wrong order will cause the load to drop.
2. Switch Q3 ON.
3. Switch Q2 OFF.
4. Switch Q1 OFF.
Electrical
Hazard
WARNING!
The UPS may still have power
after being switched to bypass
operation. Before performing
maintenance on the UPS,
follow the “Total Power Off”
procedure described in the
UPS Operation Manual. UPS
power MUST be turned 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
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