Hobart GPU-600 Series, Operation And Maintenance Manual

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OM-2244 / Operation and Maintenance Manual
DCS-600/ Series 500082 / Solid State Transformer-Rectifiers
December 15, 2014 Chapter 3-1
Page 6
Chapter 4-3, Figure 7 gives the part number for the diode.
(1) Disconnect and remove the failed SCR diode noting how the pieces are assembled. Figure 2
shows a cross section.
(2) Buff the heat sink in the area where the diode attaches to remove any oxidation.
(3)
Smear a thin film of Burndy Penetrox “A” (or similar oxide-inhibiting electrical joint compound) in
the area where the diode attaches to the heat sink.
(4) Tighten the nuts evenly until they are finger tight.
(5) Tighten each screw in 1/4 turn increments using the correct size hex key.
(6) Place the Force Indicator Gauge firmly against the top spring as shown in Figure 3. Be sure both
ends and the center are in firm contact with the spring.
(7) Tighten the screws in 1/4 turn increments until the gauge shows correct alignment between the
left edge of the rear gauge plate and the right edge of the top notch (VE3000/VE2500) on the
front gauge plate.
(8) If you have tightened the screws too much, loosen both nuts and start over. Never adjust the
force by backing off the nuts. Friction will always produce a false reading.