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3.3.3 MBP (Maintenance Bypass Module) installation:
MBP module installation steps are the same as UPS, please refer details in the
MBP user manual.
4. Cable Connections
This chapter outlines the wiring steps for AC input/output to the UPS in different
modes, as well as UPS connection to the EBMs
Before any connections, ensure that upstream circuit breakers and backfeed
contactors are in place to avoid power backfeed to the utility. It is recommended
that a warning label
with “Backfeed voltage may be present” text or similar to be
added on the backfeed contactor device. Open all UPS input circuits and check
all terminal voltages before operating. The current rating of the backfeed
contactor should be greater than that of the UPS’. Refer to the figures below
for the different wiring systems of the UPS input.
Single phase system