Scr Input Busbars; Scrs - Danfoss VLT FC Series Service Manual

D1h/D3h/D5h/D6h/J8 Drive Di...

10.2.15 SCR Input Busbars

To remove or reinstall the SCR busbars, use the following
steps. Refer to Illustration 10.10.
Disassembly
1. Remove the inrush card. Refer to
chapter 10.2.14 Inrush Card.
2. Remove 3 standoffs (11 mm), 1 from each SCR
input busbar.
3. Remove 2 screws (T25) from the black plastic
inrush support.
4. Remove 3 screws (T30) connecting the busbars to
the SCR modules, 1 from each busbar.
5. Remove the SCR input busbars.
NOTICE
COMPONENT ALIGNMENT
Fasten all components hand-tight, and then place the
inrush support enclosure to align components before
tightening.
Reassembly
Tighten hardware according to chapter 14.1 Fastener Torque
Ratings.
10 10
1. Position the SCR input busbars in the drive.
2. Fasten 3 screws (T30) connecting the busbars to
the SCR modules, 1 in each busbar.
3. Fasten 2 screws (T25) in the black plastic inrush
support.
4. Secure 3 standoffs (11 mm), 1 in each SCR input
busbar.
5. Replace the inrush card. Refer to
chapter 10.2.14 Inrush Card.
150
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VLT FC Series, D1h–D8h, Da2/Db2/Da4/Db4, E1h–E4h, J8/J9

10.2.16 SCRs

To remove or reinstall the SCR modules, use the following
steps. Refer to Illustration 10.10.
Disassembly
1.
2.
3.
4.
5.
6.
7.
Reassembly
For reassembly, refer to the SCR replacement instructions
that come with the spare parts kit.
Danfoss A/S © 02/2019 All rights reserved.
Remove the SCR input busbars. Refer to
chapter 10.2.15 SCR Input Busbars.
Remove the DC(+) busbar SCR to DC coil by first
removing 1 screw (T30) that attaches the busbar
to the DC inductor.
Remove 1 screw (T30) from each SCR module.
Remove the insulator sheet.
Remove the DC(-) busbar SCR to DC coil by first
removing 1 screw (T30).
Disconnect the gate leads, 1 from each SCR
module.
Remove 2 screws (T30) from each SCR module.
MG94A502