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OPM_SPE_XXX_10K_40K_8GB_V020.doc
Operating Manual
SitePro 10-15-20-30-40 kVA / S8
4.2.5 Automatic Bypass
In normal operation, the
Load
is supplied by the
Inverter
.
When the control system detects a fault in the
Inverter
, an overload condition or a short-circuit
condition, the
Automatic Bypass
will transfer the
critical
Load
to the
Mains
without interruption.
When the
Inverter
recovers, or the overload or
short-circuit condition is corrected, the
Load
will
be automatically transferred back to the
Inverter
.
If the UPS is unable to return to normal mode
following an automatic transfer to
Bypass mode
,
an alarm condition will be initiated.
A
Manual Bypass
(operator initiated) will not be
considered as an alarm condition.
Fig. 4.2.5-1 Block diagram Automatic Bypass
In case of parallel operation
Each unit has its own internal Bypass.
These units are continuously exchanging information, enabling all of the internal Bypass circuits in a
Parallel System to operate simultaneously.
If the Inverter of a unit fails, its Bypass circuit remains available to the Parallel System.
It is excluded only if the unit is separated from the common bus by opening its output switch
Q1
.
4.2.6 Manual Bypass
The
Manual Bypass
circuit consists of manual
switches
Q1
and
Q2
, which permits transfer of
the
Load
directly to the unconditioned AC power
without interruption, leaving the UPS available
for maintenance.
Fig. 4.2.6-1 Block diagram Manual Bypass
