POWER-MASTER 500 - Victor Technologies

430581-004 POWER-MASTER 500
IGBT Module Replacement:
The fol low ing pro ce dure can be used to re place
one of the IGBT mod ules. The IGBT can be re -
placed with out re mov ing the ca pac i tor boards, if
the ca pac i tor boards are still ok.
Step 1: Re move the screws hold ing the trans -
former leads to the IGBT mod ules. Re move the
trans former leads from both mod ules so they can
be po si tioned out of the way.
Step 2: Re move the ther mo stat so it can be po si
-
tioned out of the way.
Step 3: Dis con nect the gate drive con nec tor from
the IGBT mod ule be ing re placed.
Step 4: Re move the four mount ing screws hold -
ing the IGBT to the heatsink.
Step 5: Re move the two screws con nect ing the
ca pac i tor boards to the IGBT. Re move the brass
spacer from un der neath the ca pac i tor board
lead.
Step 6: Slide the IGBT up or down to clear the
bus bars on the ca pac i tor boards, and re move
the IGBT.
Step 7: Clean the area of the heatsink where the
IGBT mounts. This area must be free of con tam i -
na tions which would pre vent the IGBT from
mounting flush to the heatsink.
7-2
Step 1
Step 2
Step 1
Step 4
Fig ure 7-2
IGBT Re place ment
Step 5
Step 3
Step 8: Ap ply a thin layer of ther mal com pound to
the back of the new IGBT mod ule.
Step 9: Slide the new IGBT back in place.
Step 10: Re as sem ble in re verse or der of re -
moval. TORQUE MOUNTING SCREWS TO 35
IN-LBS, AND TER MI NAL SCREWS TO 27
IN-LBS.