7400 Series UPS User Manual Chapter 1 - General Description
Single Module and One plus One Systems One Plus One System
6310018a.02.doc
1-9
Issue 2
(02/98)
Redundancy configuration:
A link in the parallel control logic determines whether the one-plus-one
system operates in a "redundant" or "non-redundant" configuration.
If a non-redundant mode is selected the two static switch sections are
effectively locked together in that both static switches are turned off or
on by a single control signal. Thus if one module develops a fault, when
running, its static switch control logic will transfer its output from the
inverter to the static bypass line and simultaneously send a signal to the
static switch control logic in the second module to do likewise.
This does not happen if the system is configured as a redundant system,
in which case the second module is allowed to continue supplying the
load from its inverter when the first module trips its inverter off line.
Reverse current:
A reverse current monitor circuit detects current flowing into, rather than
out of, the module’s output terminals. Such a condition can arise if a
module develops an internal power fault or if for some reason the two
modules become unbalanced, and is liable to further damage the module
and also degrade the load supply. If a reverse current is detected the
inverter on the affected module is immediately shut down and
(depending on the system redundancy configuration) the load is
transferred to the bypass supply "Non-Redundant system", or remains on
the good inverter "Redundant system".
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