Clary S Series - Manual (Page 4)

T H E C O N T I N U O U S P O W E R C O M P A N Y
Page 4
TECHNICAL DESCRIPTION
he Digital Technology S Series Continuous
Power System (CPS) is a revolutionary new
concept in total power protection and
management. The S Series is a
microprocessor-based UPS that now allows the user
to set most of the control feature parameters. By
directly linking a personal computer to the S Series
RS232 port, frequency settings and operation, alarm
signals, load switching, fan operation, etc. can all be
programmed to meet specific application
requirements.
The S Series is a true on-line, continuous power
UPS. In the tradition of Clary products, the
S Series generates the same high quality and
proven reliability to provide the best power
protection available for today’s critical applications.
In keeping with state-of-the-art design, the power
electronics are completely governed by an on-board
microprocessor. Given the powerful memory
capability of today’s microcontrollers, this
microprocessor has evolved the UPS into an all-in-
one complete power distribution and monitoring
center. Not only is your critical load insured of the
most reliable and constant power available, but the
user may now continuously track status of the
supply components that keep the entire system
operational. Production downtime can now be
virtually eliminated by knowing exactly what patterns
the supply utility power maintains and by knowing
exactly the condition and life expectancy of the
battery reserve.
Reference the block diagram for a simplified
explanation of the system’s operation. The AC utility
source is connected to the power and micro-
electronics when the input switch is closed. The
input line is filtered, power factor corrected and
rectified for enhanced performance without
disturbing other equipment that may share the same
utility circuit. In S units, an input isolation
transformer is added. Output transformers, SNMP
adapters and many other options are available.
The microprocessor controls an Inverter Generator
that produces a low harmonic, AC sinewave for
continuous power applications.
When the input AC utility line fails, the battery circuit
within this system takes over to ensure continuous
power.
Only after properly rated power is returned, does the
microprocessor reconnect the input source back into
the system.
The microprocessor is directly tied to an external
RS232 connector port. This allows the user to
monitor and even set some of the operating
parameters. With a simple link to a personal
computer using the DT-UPS2 software program, you
can actually view, on your monitor, the event history
of the power distribution system with the
S Series unit as the central hub. More sophisticated
users may implement the optional SNMP package to
accomplish full Network Power Management.
BATTERY-DESCRIPTION
Your system contains sealed, maintenance free
lead acid batteries.1000VA consists of four (4) NP7-
12, 12 volt 7.0 ampere-hour (AH) batteries. They are
connected in series to form a 48 volt bus. 1250VA-
1500VA consists of six (6) NP7-12, 12 volt 7.0
ampere-hour (AH) batteries. They are connected in
series to form a 72 volt bus. 2000VA consists of
eight (8) NP5-12, 12 volt 5.0 AH batteries. They are
connected in series to form a 96 volt bus. Batteries
are charged with a constant current, half (0.5) amp
charger. The microprocessor controls the constant
current charging until full charge requirements are
met, then a periodic trickle charge is programmed to
the battery.
A low battery signal is generated during discharge
when the terminal voltage reaches the point where
the microprocessor determines there is 2 minutes
left of battery reserve time. This time can be
changed through the RS232 communications port.
The battery is protected by a system cutoff signal
which is activated before the terminal voltage
reaches an unsafe discharge point.
WARNING: Never attempt to service batteries, high
voltage exists within the unit which could cause
electrical shock. Servicing of batteries should be
performed or supervised by personnel
knowledgeable of batteries and the required
precautions. Keep unauthorized personnel away
from batteries. When replacing batteries use the
same number and type. The battery pack has a
keyed, polarity sensitive connector. Replace only
with factory authorized replacement parts.
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