Uninterruptible Power Supplies
Three Phase, On-Line 12.5 kVA to 75 kVA
The Staco Energy Products Company is a leading manufacturer
of AC voltage control products. Our expertise in providing
solutions to electrical power problems stems from over 60
years of experience in both the military and private business
sectors.
With over 25 years of UPS experience, the TreStar series
of Uninterruptible Power Supplies are designed to meet the
power protection needs of today's sensitive electronic and
computer loads. The energy efficient TreStar series UPS delivers
true on-line power, of high quality, with low distortion,
and true sine-wave output allowing the UPS to power almost
any combination of linear and non-linear loads. Unlike other
UPS systems, the TreStar series will provide continuous power
to any load, within the power rating of the UPS, with load
power factors ranging from 0.8 to 1.0 lagging or leading.
UPS reliability begins with its design. The TreStar series
UPS is designed with circuitry to prevent premature or unexpected
failure. A front mounted, user friendly, diagnostic display
panel allows complete access to 15 critical measurements
and 33 alarms, including stored measurements made just before
and just after an inverter stoppage. Special circuitry has
been incorporated to protect and lengthen the service life
of the most expensive and sensitive component of a UPS system...its
batteries. For added reliability the TreStar series UPS is
equipped with an electrostatic shielded output isolation
transformer that provides added electrical noise attenuation
and is K-30 rated for non-linear load duty. As a "Staco-Plus" a
wide range of planned maintenance programs is offered to
maximize the service life and reliability of your UPS through
an extensive network of factory trained professional service
personnel.
The TreStar series UPS totally isolates the connected load
from the AC primary supply, protecting it from voltage sags,
spikes, transients, RFI, and frequency variations. In the
event of an AC primary failure, an internal audible alarm
sounds and the UPS will continue, without interruption, to
provide safe, clean continuous power from its sealed batteries.
When the AC primary supply returns to normal, the UPS automatically
recharges the batteries for the next power disturbance. The
UPS comes equipped with both a static bypass switch which
transfers the load to a bypass source upon an inverter overload
and an internal maintenance bypass switch which provides
complete UPS isolation during unit servicing another ... "Staco-Plus"
TreStar Series UPS
The TreStar series UPS is available in three phase ratings
from 12.5 kVA to 75 kVA, is easy to install, maintain, and
due to its efficiency, has a very low cost of ownership.
The TreStar series UPS is a modular design with all ratings
being in a single size enclosure. The 12.5 kVA, 15 kVA, and
20 kVA TreStar ratings contain their batteries within the
UPS enclosure . The batteries for UPS ratings above 20 kVA
are supplied in a matching battery cabinet.
The battery section of any UPS is the very heart of that
system. It supplies energy to the inverter when the AC source
fails. Your UPS is dependent on a reliable , functioning,
and properly charged battery. Not only is the battery expensive,
it is also highly susceptible to both high and low temperatures,
improper charging, and will not survive if allowed to discharge
beyond certain limits. For these reasons...another "Staco-Plus"...the
TreStar series has four special battery diagnostic circuits
built-in to provide greater battery life and reliability
than any other UPS.
Overheating
Overheating is one of the primary causes of premature battery
failure. The TreStar series UPS measures the battery temperature
at all times and automatically adjusts the charging current
to maintain optimum battery temperature. This assures maximum
energy storage in the shortest possible recharge time while
preserving battery life.
Deep Discharge Protection
Most UPS systems have a low voltage cutoff mechanism to
prevent the battery from being discharged to a point that
destroys the battery. The TreStar series design recognizes
that the low voltage point for a battery differs dramatically
between rapidly discharging batteries and slowly discharging
batteries. Under full load it is safe to drop the battery
to 1.65 volts per cell and that is where other UPS systems
set the voltage cutoff. Many users reduce the load on the
UPS, after a power failure, in order to extend backup time.
Unfortunately, the voltage at which a battery will fail under
slow discharge is a much higher 1.8 volts per cell. The TreStar
series measures the discharge rate in hours and resets the
low voltage cutoff voltage to match.
Battery Diagnostics
When the AC input power fails is not the time to discover
that the battery system is not fully available. To eliminate
this possibility the TreStar series UPS runs a weekly diagnostic
test of the batteries by briefly placing them under load
by reducing the charger voltage. It then measure s and compares
the battery discharge curve to store data to confirm the
integrity of the battery. If any fault is detected, an alarm
will flash on the diagnostic display panel.
Throughout this procedure the rectifier remains on and connected
to ensure the uninterruptibility of the AC power to the critical
load.
Low AC Current
Another parameter affecting the life of the battery system
is the AC (ripple) current that appears with the DC (charging)
current. Most manufacturers ensure that the ripple current
is set at just under the battery manufacturers re commendation.
The TreStar series system reduces the ripple to 1/20th of
the maximum allowable level, thus adding years of reliable
service to the battery system.
On-Board Diagnostics and Control
The TreStar series control panel is easy to use. With only
three buttons the user may select menus and scroll up or
down within a menu to obtain readout of 15 measurements and
33 alarms.
A microprocessor reads all alarms and measurements 10 times
each second and stores 11 of these readings in memory. If
an inverter stop takes place, the 10 seconds prior to the
stop and one second after the stop may be accessed through
the control panel as an aid to diagnosing the fault.
An RS-232 port on the back of the TreStar series UPS allows
remote communication of all control panel measurements and
alarms using optional software.
General Specifications |
