Clary CMN2400D-PD - Manual (Page 4)

Page 4
THE CMN 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. A battery is provided at the input of the AC Inverter to support the load in case of utility
interruption. The CONTINUOUS power concept is a step above the typical UPS, in that, power protection
is maintained under any circumstance for the most complete and reliable service to the critical load. This
CONTINUOUS power UPS is designed for the critical, must-not-fail applications.
The CMN Series rackmount is engineered with the latest Insulated Gate Bipolar Transistor/Pulse Width
Modulation (IGBT/PWM) technology for high efficiency and reliability. 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 continuous operation over a -25% to
+35% range of nominal voltage for all load conditions. An input voltage variation outside the preset
window will transfer operation to battery energy without a shutdown.
The input AC, when within the 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. The AC inverter supplies the load and supports the
battery charger as long as input utility is available. Normally the output inverter is at 60Hz independent of
the input line frequency. The output inverter is synchronized to the utility line frequency.
During a utility power-loss, the AC rectification and battery charging capabilities of the UPS become
inactive. The fully charged battery system now becomes the source of power feeding the AC Inverter
generator. All systems are controlled by the digital microprocessor at all times.
The CMN 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
CMN 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 UPS designs.
If the unit is overloaded, it will shutdown completely if the overload is not corrected within 3 seconds.
FIGURE 1: CMN SERIES BLOCK DIAGRAM
UTILITY INPUT
BYPASS LINE
EMERGENCY
CUTOFF
SWITCH
VOLTAGE
WINDOW
DETECTOR
RFI
INPUT
FILTER
RECTIFIER
CHARGER
POWER
FACTOR
CORRECTOR
+ DC
RAILS
MICROPROCESSOR
CONTROLLER
AC
INVERTER
GENERATOR
COMPUTER
(LOAD)
STANDBY
BATTERY
COMMON
MODE
CHOKE
INPUT
ISOLATION
TRANSFORMER