Danfoss VLT AHF 005 Service Guide

11.2.19 IGBTs
To remove or reinstall the IGBT modules, use the following steps for 400 V AC and 690 V AC units. Refer to Illustration 11.13.
Disassembly in 400 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 1 thread-forming screw (T20) from each
IGBT output busbar.
6. Remove 2 screws (T40) connecting each IGBT
output busbar to the IGBT module, and remove
the busbars.
7. Remove the IGBT temperature cable by discon-
necting the cable from each IGBT module.
8. Remove the gate leads, 1 from each IGBT.
9. Remove 2 screws (T40) from each snubber
capacitor. Remove the snubber capacitors.
10. Remove the DC(+) plate by removing:
10a 1 stando (8 mm) connecting the plate
to the positive terminal of capacitor 3.
10b Screws (T25) from the positive terminals
of capacitors 1, 2, 4, 9, and 12. Number
of screws varies with drive size.
11. Remove the insulator sheet between the DC(+)
plate and the DC(-) plate.
12. Remove the DC(-) plate by removing:
12a 1 stando (8 mm) connecting the plate
to the negative terminal of capacitor 6.
12b Screws (T25) connecting the plate to the
negative terminals of capacitors 5, 7, 8,
10, and 11. Number of screws varies
with drive size.
13. Remove the plastic IGBT support (not shown) by
removing 7 screws (T25).
14. Remove the IGBTs by removing 10 screws (T25)
from each IGBT module.
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 1 thread-forming screw (T20) from each
IGBT output busbar.
6. Remove the IGBT output busbar by removing 2
screws (T40) connecting the busbar to the IGBT
module.
7. Remove the IGBT temperature cable by discon-
necting the cable from each IGBT module.
8. Remove the gate leads, 1 from each IGBT.
9. Remove 2 screws (T40) from each snubber
capacitor. Remove the snubber capacitors.
10. Remove the DC(+) plate by removing:
10a 2 thread-forming screws (T20).
10b Screws (T25) connecting the plate to the
positive terminals of capacitors 4, 8, 10,
and 12. Number of screws varies with
drive size.
11. Remove the insulator sheet between the DC(+)
plate and the DC(-) plate.
12. Remove the DC(-) plate by removing:
12a 1 stando (8 mm) connecting the plate
to the negative terminal of capacitor 2.
12b Screws (T25) connecting the plate to the
negative terminals of capacitors 1, 5,
and 6. Number of screws varies with
drive size.
13. Remove the plastic IGBT support (not shown) by
removing 7 screws (T25).
14. Remove the IGBTs by removing 10 screws (T25)
from each IGBT module.
Reassembly in 690 V AC units
For reassembly, refer to the replacement IGBT instructions
that come with the spare parts kit.
D2h/D4h/D7h/D8h/J9 Unit Dis...
VLT
®
FC Series, D1h–D8h, Da2/Db2/Da4/Db4, E1h–E4h, J8/J9
214 Danfoss A/S © 02/2019 All rights reserved. MG94A502
1111

Danfoss VLT AHF 005 Specifications

General

Brand	Danfoss
Model	VLT AHF 005
Category	DC Drives
Language	English