Table of Contents
Advertisement
1. SYSTEM OVERVIEW
1.1.
CONSTRUCTION OF THE UNIT
Be sure to operate the converter within its rated capacity.
Prevent direct exposure to sunlight, rain, or any other contaminating environment.
The System is composed of an input breaker, input filter & protection network, rectifier, inverter, isolation
transformer and output filter. The basic topology is shown in the diagram above. Operating in the normal AC
mode, energy from the 3 Phase AC source is converted to DC power and supplied to the inverter.
inverter converts the DC power to three phase AC power and supplies the static switch, which allows the unit
to disconnect from the load. The power is then fed through an isolation transformer and an output filter to the
load.
When the inverter is in an abnormal condition, such as over temperature, short circuit, abnormal output
voltage, or overloaded for a period exceeding the inverter current limit, the inverter will automatically
shutdown, in order to protect itself from damage.
Hazardous voltage exists inside the Unit (Which includes the connection terminals). Cable connection and
maintenance should be done by professional or qualified personnel.
DC capacitors are employed in this Unit; hazardous voltages still exist even when the Unit is not
energized.
Do not touch any part inside of the Unit.
1.2.
FEATURES AND ADVANTAGES
a. Reliable input protection: Circuit breakers are placed in each individual input phase.
b. Input surge protection: MOV (surge protectors) are added at the input, providing sufficient protection to
both the UNIT and the load from any lightning or surge caused by neighboring large loads.
c. EMI suppression: An EMI filter is added to meet the international EMC limits. Therefore,
very low noise is emitted, to prevent interference to other equipment connected to the same AC
source.
d. Ruggedness: The rectifiers employ phase control technology to regulate the DC bus voltage. SCRs
are employed as rectifiers to take advantage of their ruggedness under poor conditions. In addition,
inductors are used at the input to avoid deforming the AC source waveform.
* Option: The solid state transfer switch is supplied as an option for use in serial redundant systems (see page 19 for details)
WARNING!
CAUTION!
3
The
Advertisement
Table of Contents
