Specifications

Plasma Technics Inc. 1900 William St. Racine, WI 53404-1875 Phone : [phone] fax : [phone]
Web Page http://www.plasmatechnics.com E-Mail: [e-mail] Page 9
DAT210 Inverter Assembly
Please refer to the DAT 210 or SSD 110 manuals for inverter specific installation and
operational details.
SECTION 1. REASONS FOR SPECIFYING THE ASSEMBLY
The DAT210 inverter component is designed with a single phase line rectifier providing pulsating direct
current (DC) to large input filter capacitors. If the line is connected directly to the line input of the inverter,
there will be an initial large inrush current to charge the capacitors. This current is only limited by the
mains source (wiring and utility transformers) and filter capacitor internal resistance. The effect is
particularly pronounced when the inverter is operated from 240 VAC single or 3 phase at power over 1
KVA.
There are three disadvantages to directly connecting the line to the inverter.
1. High inrush can stress the filter capacitors shortening its life.
2. High inrush currents can stress the safety circuit breakers (and will blow fuses) that may work
fine during testing but will deteriorate over time causing nuisance trips.
3. Connecting any rectifier filter capacitor directly to the line causes a strong 3
rd
harmonic line
current causing a 0.6 power factor. Many companies prefer clean (low harmonics) devices in their
facility to lessen interference with other more sensitive equipment.
The 70250 inverter assembly solves these problems. A soft-start relay circuit is automatically controlled by
the inverter, pre-charge components limit inrush currents and a high current link choke to eliminate the
harmonics and correct the power factor to 0.95.
Lastly, the assembly is cost effective by eliminating the need to individually design and mount these
essential components.