Danfoss VLT FC Series, Service Manual

Page: 166 / 370

10.2.22 Twistlock DC Capacitors
To remove or reinstall the twistlock DC capacitors, use the
following steps. See
Illustration 10.18 and Illustration 10.19 .
NOTICE
CAPACITOR REPLACEMENT
When replacing capacitors, always replace the entire
bank of capacitors, even if only 1 capacitor has failed.
NOTICE
CAPACITOR TYPE
Drives can contain standard DC capacitors or twistlock
DC capacitors. Use the twistlock DC capacitor
instructions for drives manufactured within the following
time period.
•
240/400 V drives produced week 18, 2018 or
after.
•
690 V drives produced week 23, 2018 or after.
For all other drives of this size, refer to
chapter 10.2.20 Standard DC Capacitors .
Disassembly in 240/400 V AC units
See Illustration 10.18 .
1. Remove the gate drive card. Refer to
chapter 10.2.17 Gate Drive Card .
2. Remove the balance/high frequency card. Refer to
chapter 10.2.12 Balance/High Frequency Card .
3. Remove insulator sheet 1.
4. Remove 3 screws (T30) from the cylinder busbar
support bracket, and remove the bracket from
the drive.
5. Remove 3 thread-forming screws (T25), 1 from
each IGBT output busbar.
6. Remove 6 screws (T30), 2 from each IGBT output
busbar.
7. Remove 6 screws (T30), 2 from each snubber
capacitor.
8. To remove the DC(-) plate:
8a Unfasten 3 thread-forming screws (T20)
near the IGBT modules.
8b Remove 1 standoff (8 mm) from the
capacitors.
8c Remove 2 screws (T25) from the
capacitors.
9. Remove insulator sheet 2 by unfastening 8 screws
(T25).
10. Remove the DC(+) plate by removing 3 thread-
forming screws (T20) near the IGBT modules.
11. Remove the midplate by removing 1 standoff (8
mm).
12. Remove insulator sheet 3.
13. To remove a twistlock DC capacitor, use the
special tool provided in the parts kit (or grip the
edges with a large pliers).
14. Turn the twistlock DC capacitor approximately 30°
counterclockwise to release it. Pull the capacitor
out of the drive.
Reassembly in 240/400 V AC units
Start all fasteners with hand tightening, and then torque
according to
chapter 14.1 Fastener Torque Ratings .
1. Align the arrow on the rim of the twistlock DC
capacitor with the arrow on the capacitor bank
housing, and insert it into the drive.
2. Turn the DC capacitor clockwise approximately
30° until it locks in place. Check that the
capacitor gasket is fully seated.
3. Position insulator sheet 3 over the capacitors.
4. Position the midplate on top of the insulator
sheet.
5. Fasten 1 standoff in the midplate.
6. Place the DC(+) plate in the unit.
7. Position insulator sheet 2 over the midplate and
DC(+) plate.
7a Fasten 8 screws (T25) in the DC(+) plate.
7b Fasten 3 thread-forming screws (T20).
8. Position the DC(-) plate in the unit.
8a Fasten 3 thread-forming screws (T20)
near the IGBT modules.
8b Secure 2 screws (T25) in the plate.
8c Fasten 1 standoff (8 mm).
9. Position the 3 snubber capacitors in the unit and
fasten with 6 screws (T30), 2 per snubber
capacitor.
10. Replace insulator sheet 1.
11. Replace the balance/high frequency card. Refer to
chapter 10.2.12 Balance/High Frequency Card .
12. Replace the gate drive card. Refer to
chapter 10.2.17 Gate Drive Card .
D1h/D3h/D5h/D6h/J8 Drive Di...
VLT
®
FC Series, D1h–D8h, Da2/Db2/Da4/Db4, E1h–E4h, J8/J9
164 Danfoss A/S © 02/2019 All rights reserved. MG94A502
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