Danfoss VLT HVAC Drive FC 100 Service Manual page 160

High Power Service Manual for VLT
Adjustable Frequency Drives
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.
Figure 7.27: D1/D3 IGBT Module (2 of 2)
1 IGBT module
2 Snubber capacitor (Step 9)
3 IGBT bus bar assembly (Step 8)
4 Retaining nut (Step 8)
®
FC Series
3
2
1
MG.90.L1.22 - VLT ® is a registered Danfoss trademark
7 D-Frame Sizes Disassembly and Assembly
4
5
6
7
5 Retaining screw (Step 9)
6 Retaining nut (Step 11)
7 Intermediate IGBT output bus bar (Step 11)
Instructions
7
7-29