Modifications reserved
Page 14/99
OPM_SPE_XXX_10K_40K_8GB_V020.doc
Operating Manual
SitePro 10-15-20-30-40 kVA / S8
4.2.3 Mains failure operation
When the
Mains
is no longer within acceptable tolerances,
the
Battery
will provide the DC power to the
Inverter
.
The
Inverter
will maintain continuous AC power to the
Load
until the
Battery Voltage
reaches the lower limit of
the
Inverter
operation capability.
During the discharge, the
LCD screen
displays the
estimated time the
Battery
can support the critical load.
Prior to complete
Battery
discharge, the
"
stop operation
"
alarm (shutdown imminent) warns the operator that the
Battery
is almost discharged and the UPS is about to shut
down.
Fig. 4.2.3-1 Block diagram Mains Failure operation
In case of parallel operation
With a Parallel System for power capacity (see Section 4.3)
•
With the
Bypass Mains power available,
a “Battery low” warning on any unit will cause the Load
to be transferred to Mains (after a selectable time delay).
•
With
Bypass Mains power
not available, a “Battery low” warning on any unit will start the “
stop
operation
” timer (adjustable).
The Load will shut down at the end of the “
stop operation
” time period.
With a Parallel System for redundancy (see Section 4.3)
•
When a Battery low warning occurs on a unit not necessary to support the present load, this unit
will shut down after a timeout period (selectable).
The Load is shared between the other units.
•
As the warning occurs on one unit necessary to support the present load, the system starts the
"
stop operation
" timeout (selectable).
The Load will shut down at the end of the “
stop operation
” time period.
4.2.4 Mains recovery operation
As soon as the AC input power recovers, the
Rectifier
will
start automatically
, supplying DC power to the
Inverter
and recharging the
Battery
.
If the
Inverter
was previously shut down due to low
Battery
, the
Load
will be initially powered by
Mains
through the
Automatic Bypass
.
When the
Battery
is sufficiently recharged to ensure a
minimum time of operation with the present load, the
Inverter
will start automatically and the
Load
will be
transferred back to the
Inverter
.
Fig. 4.2.4-1 Block diagram Mains recovery operation
In case of parallel operation
When the AC input power recovers,
the Rectifiers will start up sequentially,
according to their
number in the Parallel System. This minimizes the
initial inrush current.
The
Inverters will start up automatically
, but only when the Battery has been sufficiently recharged
for a
minimum runtime
with the present load.
When
enough Inverters to supply the Load have been restarted,
the Load will be transferred from the
Automatic Bypass back to the Inverter output.
