Danfoss VLT FC Series Service Manual page 220

D2h/D4h/D7h/D8h/J9 Unit Dis...
To remove the standard DC capacitors from 690 V AC units,
use the following steps. Refer to Illustration 11.15.
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 the insulator sheet from the capacitor
bank.
5. Remove the IGBT output busbars by removing 3
thread-forming screws (T20), 1 per busbar, and 6
screws (T40), 2 per busbar.
6. Remove the snubber capacitors, 1 from each IGBT
module, by removing 2 screws (T40).
7. Remove the DC(+) plate by removing:
7a
7b
8. Remove the insulator sheet between the DC(+)
plate and the DC(-) plate. If necessary, first
remove the screws connecting the DC(-) plate
and the 2 DC center plates to the capacitors.
11 11
9. Remove the DC(-) plate by removing:
9a
9b
10. Remove the insulator sheet between the DC(-)
plate and the 2 DC center plates. If necessary, first
remove the screws connecting the 2 DC center
plates to the capacitors.
11. Remove DC center plate 1 by removing:
11a
11b
11c
12. Remove DC center plate 2 by removing:
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VLT
Two thread-forming screws (T20).
Screws (T25) connecting the plate to the
positive terminals of capacitors 4, 8, 10,
and 12. The number of screws (T25)
varies based on the size of the drive.
The standoff (8 mm) connecting the
plate to the negative terminal of
capacitor 2.
Screws (T25) connecting the plate to the
negative terminals of capacitors 1, 5,
and 6. The number of screws (T25)
varies based on the size of the drive.
1 standoff (8 mm) connecting the plate
to the positive terminal of capacitor 7.
Screws (T25) connecting the plate to the
negative terminal of capacitors 4, 8, 10,
and 12.
Screws (T25) connecting the plate to the
positive terminals of capacitors 3, 9, and
11. Number of screws (T25) varies based
on the size of the drive.
Danfoss A/S © 02/2019 All rights reserved.
FC Series, D1h–D8h, Da2/Db2/Da4/Db4, E1h–E4h, J8/J9
12a
12b
12c
13. Remove the capacitor locking panel by removing
10 screws (T25 thread-forming).
Reassembly in 690 V AC units
Reinstall in reverse order of this procedure. Tighten
hardware according to chapter 14.1 Fastener Torque Ratings.
1 standoff (8 mm) connecting the plate
to the positive terminal of capacitor 6.
Screws (T25) connecting the plate to the
negative terminal of capacitors 3, 7, 9,
and 11.
Screws (T25) connecting the plate to the
positive terminals of capacitors 1, 2, and
5. The number of screws (T25) varies
based on the size of the drive.
MG94A502