Scr And Diode Modules - Danfoss VLT Series Service Manual

7.10 SCR and Diode Modules

1. Remove lower DC capacitor bank in accordance
with procedure.
2. Remove input terminal plate in accordance with
procedure.
3. Remove wire retaining nut (10 mm) from each of
3 SCR input bus bars (BB41).
4. Note color coding for each of 3 wires attached to
retaining studs. Ensure that correct wire is
attached to applicable stud upon reassembly.
Remove wiring from studs.
Retaining nuts
(Step 7)
Wire retaining nut on
bus bar BB41 (Step 3)
CONTINUED NEXT PAGE
Figure 7-8. SCR and Diode Modules (1 of 3)
5. Remove wire retaining nut (8 mm) from SCR
output bus bars (BB42). One from (+) DC bus bar
and one from (–) DC bus bar.
6. Note color coding for each wire attached to
retaining studs. Ensure that correct wire is
attached to applicable stud upon reassembly.
Remove wiring from studs.
7. Remove 4 retaining nuts (13 mm) on side of bus
bars, 2 on each bus bar.
VLT is a registered Danfoss trademark
SCR module
Diode module
Wire retaining nuts for
output bus bars BB42
(Steps 5 & 6)
7-7