Danfoss VLT FC Series Service Guide

10.2.19 IGBTs
Disassembly in 240/400 V AC units
1. Remove the gate drive card. Refer to
chapter 10.2.17 Gate Drive Card.
2. Remove the SCR input busbars. Refer to
chapter 10.2.15 SCR Input Busbars.
3. Remove the balance/high frequency card. Refer to
chapter 10.2.12 Balance/High Frequency Card.
4. Remove the insulation sheet from the capacitor
bank.
5. Remove the cylinder busbar support bracket by
removing 3 screws (T30).
6. Remove 1 thread-forming screw (T25) from each
IGBT output busbar.
7. Remove the IGBT output busbar by removing 2
screws (T30), from each IGBT output busbar.
8. Disconnect the IGBT temperature cable from each
IGBT module.
9. Remove the gate leads, 1 from each IGBT module.
10. Remove the snubber capacitor from each IGBT
module by removing 2 screws (T30).
11. To remove the DC(-) plate:
11a Remove 3 screws (T20) next to the IGBT
modules.
11b Unfasten 1
stando (8 mm) connecting
the plate to the negative terminal of
capacitor 3.
11c Remove the screws (T25) connecting the
plate to the negative terminals of
capacitors 4 and 5. The number of
screws varies based on drive size.
12. Remove the insulator sheet between the DC(-)
plate and the DC(+) and midplate.
13. To remove the DC(+) plate:
13a Remove 3 screws (T20).
13b Unfasten 1 stando (8 mm) connecting
the plate to the positive terminal of
capacitor 2.
13c Remove the screws (T25) connecting the
plate to the positive terminals of
capacitors 1 and 6. The number of
screws varies based on drive size.
14. Remove the plastic IGBT support (not shown) by
removing 4 screws (T25).
15. Remove the IGBTs by removing 4 screws (T25)
from each IGBT.
Disassembly in 690 V AC units
1. Remove the gate drive card. Refer to
chapter 10.2.17 Gate Drive Card.
2. Remove the SCR input busbars. Refer to
chapter 10.2.15 SCR Input Busbars.
3. Remove the balance/high frequency card. Refer to
chapter 10.2.12 Balance/High Frequency Card.
4. Remove the insulation sheet from the capacitor
bank.
5. Remove the cylinder busbar support bracket by
removing 3 screws (T30).
6. Remove 1 thread-forming screw (T25) from each
IGBT output busbar.
7. Remove the IGBT output busbar by removing 2
screws (T30) from each IGBT output busbar.
8. Disconnect the IGBT temperature cable from each
IGBT module.
9. Remove the gate leads, 1 from each IGBT.
10. Remove the snubber capacitor from each IGBT
module by removing 2 screws (T30).
11. To remove the DC(-) plate:
11a Remove 3 screws (T20 thread-forming)
next to the IGBT modules.
11b Remove 1 stando (8 mm) connecting
the plate to the negative terminal of
capacitor 1.
11c Remove 1 screw (T25) from the negative
terminal of capacitor 3.
11d Remove 1 round plastic alignment cap.
12. Remove the insulator sheet between the DC(-)
plate and the DC(+) plate.
13. To remove the DC(+) plate:
13a Remove 3 thread-forming screws (T20).
13b Remove 2 screws (T25) connecting the
plate to the positive terminals of
capacitors 5 and 6.
14. Remove the plastic IGBT support (not shown) by
removing 4 screws (T25).
15. Remove the IGBTs by removing 4 screws (T25)
from each.
Reassembly
For reassembly, use the replacement IGBT instructions.
D1h/D3h/D5h/D6h/J8 Drive Di...
VLT
®
FC Series, D1h–D8h, Da2/Db2/Da4/Db4, E1h–E4h, J8/J9
154 Danfoss A/S © 02/2019 All rights reserved. MG94A502
1010

Danfoss VLT FC Series Specifications

General

Brand	Danfoss
Model	VLT FC Series
Category	DC Drives
Language	English