Scrs; Brake Igbt Module - Danfoss VLT FC 100 Service Manual

Disassembly and Assembly In...

7.3.16 SCRs

2
1
15
14
13
7 7
12
11
Figure 7.7 SCRs and IGBTs
1 SCR input bus bar
2 0.4 in [10 mm] nut
3 T30 screw
4 SCR
5 IGBT output bus bar
6 IGBT module (1 of 3)
7 IGBT gate signal connector
8 IGBT thermal sensor
connector
Table 7.7 Legend to Figure 7.7
1. Remove the SCR input bus bars in accordance
with chapter 7.3.15 SCR Input Bus Bars.
2. Remove the (+) DC bus bar SCR to DC coil by first
removing one screw (T30) that attaches the bus
bar to the DC inductor.
3. Remove one screw (T30) from each SCR module.
For reassembly, use the replacement SCR instructions.
4. Remove the Mylar insulator and retain it for
reassembly.
5. Remove the (-) DC bus bar SCR to DC coil
following the same procedure as with the (+) DC.
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Service Manual
3
4
5
6
7
8
9
10
9 Snubber capacitor
10 T30 Screw
11 Round bus bar
support bracket
12 Current sensor
cylinder bus bar
13 T30 screw
14 T30 screw
15 T25 thread-forming
screw
Danfoss A/S © Rev. 2014-02-10 All rights reserved.
6. Disconnect the gate leads, one from each SCR
module.
7. Remove one screw (T30) from either side of each
SCR module.
For reassembly, use the replacement SCR instructions.

7.3.17 Brake IGBT Module

1
5
4
Figure 7.8 Brake IGBT module
1 T20 thread-forming screws
2 T25 thread-forming screw
3 T25 screws
Table 7.8 Legend to Figure 7.8
1. Remove the IGBT gate drive board in accordance
with chapter 7.3.14 IGBT Gate Drive Card.
2. Remove the line power terminal and motor
terminal in accordance with chapter 7.3.6 Line
Power Input Terminal Block and chapter 7.3.7 Motor
Terminal Block.
3. Remove the two brake to DC link bus bars in
accordance with chapter 7.3.12 DC Bus Rails.
4. Remove two thread-forming screws (T20) from
the top of the brake IGBT module.
5. Remove the brake snubber capacitor by removing
two screws (T30), one from each bus bar.
2
3
4 T30 screws
5 Snubber capacitor
MG94A222