Image Description -  0662-4

A block diagram is captioned “Figure 4.  General System Layout for 
the Uninterruptible Power Supply System at the OPF HB-3.”  Labeled
boxes represent components of an electrical system.  Lines indicating
the direction of current flow through the system connect the boxes.
It shows that facility power may reach the Output Transformer/Filter
Assembly and then the main circuit breaker by one of two paths. One
goes through a Breaker, and a Static Bypass Switch. The other path
goes through a Breaker to a Rectifier, an Inverter, and a Relay (with
another relay and the battery between this path and Ground).