Remove the control rectifier and relay
(2) Install the discharge resistor (para
Remove the discharge resistor (para
(4) Install the control rectifier and relay rec-
c. Cleaning ard Inspection.
(1) Clean the relay panel with an approved
cleaning solvent and dry thoroughly.
(2) Inspect the relay panel for dents, breaks,
cracks, or other damage.
the relay panel assembly.
(3) Replace a defective relay panel as neces-
Section Il. RECTIFIERS, CAPACITORS, AND RESISTORS
the control rectifier, the relay rectifier, and the
The control rectifier provides dc voltage for the
main power rectifier.
welding current control circuit. The relay rectifier
When malfunction of the sele-
provides de voltage for the dc control relays. The
nium rectifier occurs, thoroughly ventilate the
main power rectifier provides dc voltage for dc
area to prevent inhalation of poisonous fumes. Do
straight or reverse polarity welding.
not handle the damaged rectifier while it is warm,
to avoid absorption of the poisonous selenium
oxide compound through the skin. Failure to ob-
serve this warning can result in severe injury or
Figure 6-7. Control rectifier,
relay rectifier, control relays, and
relay panel terminal
board, removal and installation, Model DAR300HFSG.