Uninterruptible Power Supplies
Three Phase, On-Line 100 kVA to 250 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 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 into the TreStar series UPS designed 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"
Built-In Diagnostics
The measurements are:
- Inverter: voltage, frequency and current.
- Bypass: voltage, frequency and current
- Load: Voltage, frequency, current, percent of capacity
and crest factor.
- Rectifier: Volts and current
- Battery: Current, Time remaining
The alarms are:
- primary supply failure
- phase sequence error
- battery fault
- battery contactor open
- shutdown imminent
- battery discharging
- DC voltage high/low
- output breaker open
- bypass switch closed
- overtemperature
- reserve breaker open
- static switch fault
- bypass frequency fault
- bypass volts high or low
- battery charge inhibited
- inverter volts high or low
- backfeed protection active
- out of synchronization
- inverter fault
- harmonic filter open
- input breaker open
- inverter not running
- inverter inhibited
- inverter stop
- load not supplied
- load on bypass
- current limit
- stop due to overload
- overload
- bypass fault
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TreStar Series UPS
With the addition of these new 100 kVA to 250 kVA units,
the TreStar series of On-Line UPS products is now available
in ratings from 12 kVA through 250 kVA. Modular design makes
these units easy to install and greatly reduces maintenance
re q u i rements. The advanced battery management system
has been designed to reduce battery maintenance and extend
battery life by up to 20%. The reduced maintenance and extended
battery life coupled with the TreStar series high operating
efficiency will provide a very low cost of ownership.
The battery section of any UPS is the very heart of that
system. It supplies energy to the invert e r 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 each UPS designed 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 c u t o ff. 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 posibility the Tre S t a r series UPS runs a weekly
diagnostic test of the batteries by briefly placing them
under load by reducing the charger voltage. It then measures
and compares the battery discharge curve to stored 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 rippple current
is set at just under the battery manufacturers recommendation.
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 "SE" 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 micro processor 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 "SE" series
UPS allows remote communication of all control panel measurements
and alarms using optional software.
General Specifications |
