APC Smart-UPS VT Installation Manual download pdf (Page 34)

28 Smart-UPS

VT Maintenance Bypass Panel w Power Distribution, 10-30kVA, 208V - 990-4199B

Operation

The MBP 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 MBP to be turned ON or OFF, depending on the operational mode.

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 MBP is shipped with its switches in the OFF position (graphic A).

Normal operating mode

To enter normal operating mode (graphic B), 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.

See also

Refer to the Smart-UPS VT 10-30kVA Operation Manual (p/n 990-1599) for an

overview of the functionality of the user interface.

Input

UPS

Static

Bypass

Load

Panel

UPS Input

Bypass

UPS Output

Input

Output

O OFF

I ON

O OFF

I ON

O OFF

I ON

Input

UPS

Static

Bypass

Load

Panel

UPS Input

Bypass

UPS Output

Input

Output

O OFF

I ON

O OFF

I ON

O OFF

I ON

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APC Smart-UPS VT Installation Manual Page 34

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