Clary SP U-MPL - Manual (Page 4)

Page 4
THE SP-MPL SERIES RACKMOUNT
A digital on-line, sinewave UPS is the only total solution to virtually any power problem. It
effectively provides CONTINUOUS POWER, by regenerating the incoming AC to DC and then
back to a highly regulated AC generator. A battery can be provided at the input of the AC
generator to support the load in case of utility interruption. The CONTINUOUS power concept is
a step above the typical power conditioner, in that, power protection is maintained under any
circumstance for the most complete and reliable service to the critical load. This CONTINUOUS
power UPR is designed for the critical, must-not-fail applications.
The Digital Technology (DT) Series rackmount is engineered with the latest Insulated Gate
Bipolar Transistor/Pulse Width Modulation (IGBT/PWM) technology for high efficiency and
reliability. The uninterruptible power system (UPS) is the ruggedized version of the DT family of
products. The electronics are completely governed by an on-board microprocessor. This allows
for not only a digitally processed precision output waveform, but also provides for full interactive
access and control for the user through an RS232 computer port.
Refer to the simplified block diagram, Figure 1, for system description. An AC source is fed
through a double pole breaker for both Hot and Neutral protection. This breaker then feeds the
power circuits and all internal microelectronics. Input voltage is monitored to allow for operation
over a -25% to +35% range of nominal voltage for all load conditions. An input voltage variation
outside this preset window will discontinue power to the critical load.
The input AC, when it is within this specified window is power factor corrected and then sent to
the rectification stage. The DC rectifier stage provides both positive and negative voltages to a
DC rail stage, which then feeds the digitally controlled inverter AC generator. The AC inverter
generator in turn supplies the load. Normally the output inverter generator is at 60Hz
independent of the input line frequency.
The DT Series on-line topology is unique to other on-line systems in that it is designed to meet
the needs of all non-linear type loads while providing input power factor correction. Computers
and telecommunications equipment, with their switching power supplies are considered a non-
linear load, which can be very abusive to most power protection equipment and could decrease
life expectancy. The DT Series is specially designed with a power factor corrected input to
eliminate harmonics back into the power source as well as accept non-linear loads and protect
them efficiently without any output waveform degradation common to other UPR designs.
FIGURE 1: SP-MPL SERIES BLOCK DIAGRAM
EMERGENCY
CUTOFF
SWITCH
MICROPROCESSOR
CONTROLLER
LOAD
UTILITY INPUT
BYPASS LINE
VOLTAGE
WINDOW
DETECTOR
RFI
INPUT
FILTER
RECTIFIER
POWER
FACTOR
CORRECTOR
+ DC
RAILS
AC
INVERTER
GENERATOR
COMMON
MODE
CHOKE