Critical Power
Modifications reserved
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GE_UPS_USM_TLE_SUL_M16_M50_2bU_V010.docx
User Manual
TLE Series 160 - 500 UL S2B
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
shows the estimated
time the
Battery
can support the
critical Load
.
Prior to complete
Battery
discharge, 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 (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
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 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 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.
