Danfoss VLT FC Series Service Manual page 228

D2h/D4h/D7h/D8h/J9 Unit Dis...
690 V AC Power Size
To remove the twistlock DC capacitors from 690 V AC
units, use the following steps. Refer to Illustration 11.23.
Disassembly in 690 V AC units
1. Remove the gate drive card. Refer to
chapter 11.2.14 Gate Drive Card.
2. Remove the balance/high frequency card. Refer to
chapter 11.2.13 Balance/High Frequency Card.
3. Remove the DC bus rails. Refer to
chapter 11.2.18 DC Bus Rails.
4. Remove insulator sheet 1.
5. To remove the IGBT output busbars:
5a
5b
6. Remove the snubber capacitors, 1 from each IGBT
module, by removing 2 screws (T40) from each
snubber capacitor.
7. To remove the DC(+) plate:
7a
7b
8. Remove insulator sheet 2. If necessary, first
11 11
remove the screws connecting the DC(-) plate
and the 2 midplates to the capacitors.
9. To remove the DC(-) plate:
9a
9b
10. Remove insulator sheet 3 between the DC(-) plate
and the 2 midplates. If necessary, first remove the
screws connecting the 2 midplates to the
capacitors.
11. To remove midplate 1:
11a
11b
226
®
VLT
Remove 3 thread-forming screws (T20),
1 per busbar.
Remove 6 screws (T40), 2 per busbar.
Remove 2 thread-forming screws (T20).
Remove 4 screws (T25) connecting the
plate to the positive terminals of
capacitors 4, 8, 10, and 12. Number of
screws varies based on the size of the
drive.
Remove 1 standoff (8 mm) connecting
the DC(-) plate to the negative terminal
of capacitor 2.
Remove the screws (T25) connecting the
DC(-) plate to the negative terminals of
capacitors 1, 5, and 6. Number of screws
varies based on the size of the drive.
Remove 1 standoff (8 mm) connecting
midplate 1 to the positive terminal of
capacitor 7.
Remove the screws (T25) connecting
midplate 1 to the negative terminal of
capacitors 4, 8, 10, and 12.Number of
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FC Series, D1h–D8h, Da2/Db2/Da4/Db4, E1h–E4h, J8/J9
11c
12. To remove midplate 2:
12a
12b
12c
13. Remove the capacitor locking panel by removing
10 thread-forming screws (T25).
14. To remove a twistlock DC capacitor, use the
special tool provided in the parts kit (or grip the
edges with a large pliers).
15. Turn the twistlock DC capacitor approximately 30°
counterclockwise to release it. Pull the capacitor
out of the housing.
Reassembly in 690 V AC units
Reinstall in reverse order of this procedure. Tighten
hardware according to chapter 14.1 Fastener Torque Ratings.
screws varies based on the size of the
drive.
Remove the screws (T25) connecting
midplate 1 to the positive terminals of
capacitors 3, 9, and 11. Number of
screws varies based on the size of the
drive.
Remove 1 standoff (8 mm) connecting
midplate 2 to the positive terminal of
capacitor 6.
Remove the screws (T25) connecting
midplate 2 to the negative terminal of
capacitors 3, 7, 9, and 11.
Remove the screws (T25) connecting
midplate 2 to the positive terminals of
capacitors 1, 2, and 5. Number of screws
varies based on the size of the drive.
MG94A502