Toshiba 1800 Power Supply User Manual


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1800 Series Single Phase Uninterruptible Power Systems
Product Specifications – Rev 3.0 August 2008
2.4 kVA
Page 1 of 6
1.0 Scope
This specification describes the Toshiba On-Line Uninterruptible Power System (UPS),
1800 Series. The series will supply a computer grade AC output sine wave which is
unaffected by the quality of the AC input. The input voltage is single phase and the
output voltage is single phase.
2.0 General Operation
Under normal operating conditions, the UPS' rectifier converts alternating current (AC
power) to direct current (DC power), which is required for the system's inverter and
battery charger. The charger supplies regulated DC power to keep the batteries
constantly charged. The inverter uses pulse width modulation (PWM) that fully utilizes
the characteristics of insulated-gate bipolar transistors (IGBT) to convert DC power to
regulated AC power. Therefore there is a constant supply of power. The batteries will
instantaneously supply the inverter DC power should an AC power line failure occur.
2.1 Performance Standards
The UPS is designed with the applicable sections of UL, CUL, and ISO 9001 14001. The
UPS has UL, CUL and CE listing.
3.0 General
3.1 Materials
All materials used are of new manufacture using the latest technology and has not been in
prior service except for specified factory testing. IGBT's (insulated-gate bipolar
transistors) are used exclusively in inverter sections.
3.2 Components
All functioning components are solid state with no moving parts.
3.3 Installation
The installation of the UPS complies with the UPS manufacturer's recommendations that
are supplied with the delivery of the UPS. The UPS is complies with Local electrical
codes and the National Electric Code. All wiring complies exactly with what is specified.
3.4 Assembly
The UPS is delivered fully assembled and be fully functional.
4.0 System Theory and Operation
4.1 Theory
AC input from the utility system is converted into DC power. The stepped up DC power
is then converted to AC power by the inverter. The output voltage waveform of the
inverter will be the pulse voltage waveform modulated by the PWM control using the
37.5 kHz switching frequency sine wave. The PWM-Modulated voltage waveform is
transformed into a sine voltage waveform by the inductive component of the inverter
inductor and by the capacitive component of the capacitor filter. The inverter uses the
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