Response To A Power Failure; Ups Response - Liebert 300 series Installation, Operaton & Maintenance Manual

3.8.3 Emergency Shutdown
In the unlikely event an emergency shutdown is
necessary, the operator should: Turn the Rotary
Switch counterclockwise directly to Position
S 5 - SYSTEM OPT
ECTION
you have an External Maintenance Bypass
Cabinet.
CAUTION
All power will be disconnected from the
critical load and UPS.
1.
Call Liebert Customer Service and Support.
2.
To restart the UPS after the cause of the
emergency shutdown has been corrected,
perform the start-up procedure.
3.9 RESPONSE TO A POWER
FAILURE
If input power fails while the load is on UPS
(Rotary Switch in Position 4), the UPS battery
will supply power to the inverter which supports
the load.

3.9.1 UPS Response

1.
UPS battery begins supplying power
without interruption to the inverter.
2.
The Input LED on the Power Status
Diagram extinguishes. The Output LED
remains illuminated.
3.
The "Pause" LED on the Advisory Display
illuminates, warning operator not to turn
the Rotary Switch.
CAUTION
Movement of Rotary Switch during a
power failure will result in an immediate
loss of power to the load.
4. The audible alarm will sound if the power
failure lasts longer than 10 seconds.
5.
The screen displays the following message:
318 Installation, Operation and Maintenance Manual (8195)
0.
if
IONS
The internal control system begins sensing
actual charge in the battery in order to calculate
the amount of time the battery can support the
critical load. The initial process of sensing and
calculation requires approximately four
minutes.
6. After the initial calculation process, the
following message will appear:
The time remaining number (reported in the
remaining. Thereafter, the process of sensing
and re-calculation will continue until the
battery time remaining has decreased to 5
minutes. The time remaining number is updated
every 30
seconds. (If conditions change, the time
remaining number may be inaccurate for a few
minutes as the control system makes its
calculations.)
When very light loads are supported, or when
multiple battery banks are connected, the
display message may show a limited projection
indicated
by "~30" (or a smaller number,
on load). As more data is gathered by the
processing system, the estimate may be revised
and more time added, to a maximum of '399". In
extreme cases of small loads on multiple battery
banks, the display wilI stay at "299" until the
battery discharges below 99 minutes.
7. When the UPS reaches the Low Battery
Warning Time, the audible alarm will sound
again.
UPS ON BAlTERY
Calculating time
Remaining
Check Messages
UPS ON BAlTERY
Time Remaining
Check Messages
a
based