8. Remove the 4 (10 mm) retaining nuts at the top of the IGBT bus bar assy.
9. Remove the 6 retaining screws on the upper portion of the IGBT modules. These
screws also attach the snubber capacitors to the IGBT modules. Remove the 3 snubber
capacitors.
10. Remove the IGBT bus bar assy.
11. At the bottom end of a IGBT module, remove the 6 retaining screws (2 each for U,
V, and W intermediate IGBT output bus bars).
12. Remove the retaining nut (8 mm) from the 3 intermediate IGBT output bus bars.
Remove the intermediate IGBT output bus bars.
13. Remove the IGBT module.
14. Clean the heatsink surface with a mild solvent or alcohol solution.
REASSEMBLY
1.
Replace the IGBT module in accordance with the instructions enclosed with the replace-
ment module.
2.
Tighten the remaining T25 and 8 mm screws to 2.3 Nm (20 in-lbs) and T30 and 10 mm
to 4 Nm (35 in-lbs).
3.
Reassemble the adjustable frequency drive in reverse order of disassembly and tighten
the attachment hardware in accordance with the torque tables.
130BX159.10
1
2
3
4
5
6
7
Figure 7.27: D1/D3 IGBT Module (2 of 2)
1
IGBT module
5
Retaining screw (Step 9)
2
Snubber capacitor (Step 9)
6
Retaining nut (Step 11)
3
IGBT bus bar assembly (Step 8)
7
Intermediate IGBT output bus bar (Step 11)
4
Retaining nut (Step 8)
High Power Service Manual for VLT
®
FC Series
Adjustable Frequency Drives
7 D-Frame Sizes Disassembly and Assembly
Instructions
MG.90.L1.22 - VLT
®
is a registered Danfoss trademark
7-29
7
Summary of Contents for VLT HVAC FC 100
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