Danfoss VLT FC Series, Руководство по обслуживанию

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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 Two thread-forming screws (T20).
7b 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.
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.
9. Remove the DC(-) plate by removing:
9a The standoff (8 mm) connecting the
plate to the negative terminal of
capacitor 2.
9b 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.
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 1 standoff (8 mm) connecting the plate
to the positive terminal of capacitor 7.
11b Screws (T25) connecting the plate to the
negative terminal of capacitors 4, 8, 10,
and 12.
11c 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.
12. Remove DC center plate 2 by removing:
12a 1 standoff (8 mm) connecting the plate
to the positive terminal of capacitor 6.
12b Screws (T25) connecting the plate to the
negative terminal of capacitors 3, 7, 9,
and 11.
12c 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.
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 .
D2h/D4h/D7h/D8h/J9 Unit Dis...
VLT
®
FC Series, D1h–D8h, Da2/Db2/Da4/Db4, E1h–E4h, J8/J9
218 Danfoss A/S © 02/2019 All rights reserved. MG94A502
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