Under normal operation switches A and C
will be closed and switch B will be open. The inverter will be feeding
the load through its static switch at a phase and frequency which is
synchronized with the bypass supply.
To initiate a manual transfer the
inverter is first switched off after
verification that the inverter is synchronized with the bypass.
This will force the static switch to affect an immediate no-break transfer to
the bypass supply (can expand on this if required). Now the manual bypass
switch B can be safely closed consequently paralleling the bypass through 2 circuits:
the manual bypass switch and the bypass static switch. All that then
remains is to isolate the UPS for maintenance by opening switches A and C.
Retransfer to inverter can by carried
out by effectively reversing the above procedure.
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