ABB MegaFlex UL S1 Series User Manual

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MegaFlex 1000 to 1600 UPS User Manual / REV-A
4.2.3 Utility Failure Operation
When the
Utility
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 the
Battery completely discharging, the "stop
operation
" alarm (shut-
down 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 Utility Failure operation
In case of RPA Parallel System
With a Parallel System for
Power Capacity (see Section 4.3)
•
With the Bypass Utility power available, a “Battery low” warning on any unit will cause the Load
to be
transferred to Utility (after a selectable time delay).
•
With Bypass Utility 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 (RPA - 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 Utility 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 Utility
throug
h the Automatic Bypass.
When the
Battery
is recharged enough 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 Utility recovery operation
In case of RPA Parallel System
When the AC input power recovers,
the Rectifiers will start-up sequentially, according to their number in the
RPA
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
Bypa
ss back to the Inverter output.

ABB MegaFlex UL S1 Series Specifications

General

Brand	ABB
Model	MegaFlex UL S1 Series
Category	UPS
Language	English