OUTPUT RECTIFIER AND CHOKE
The output rectifier receives the AC output from the
main transformer secondary and rectifies it to a DC
voltage level. Since the outuput choke is in series with
the negative leg of hte output rectifier and also in series
with the welding load, a filtered DC output is applied to
the machine output terminals. Refer to Figure E.7.
When in the STT mode, the control circuit monitors
the voltage conditions at the arc, and turns the STT
chopper module on or of as necessary to generate an
STT output waveform. The STT current transducer in
the STT circuit signals the control board to limit output
to 375 amps maximum.
E-8 E-8
THEORY OF OPERATION
POWER WAVE 455M/MSTT
Return to Section TOC Return to Section TOC Return to Section TOC Return to Section TOC
Return to Master TOC Return to Master TOC Return to Master TOC Return to Master TOC
FIGURE E.7 – OUTPUT RECTIFIER, OUTPUT CHOKE AND STT CHOPPER BOARD
