9.2.7 Soft Charge Resistor
1.
Remove power card mounting plate in
accordance with instructions.
2.
Remove soft charge mounting plate in
accordance with instructions.
3.
Note: soft charge resistors are mounted on side
panel; one on each side for units with two
inductors, an additional one for units with three
inverters.
4.
Loosen bottom 8mm nut.
5.
Remove top 8mm nut to remove soft charge
resistor.
Reinstall in reverse order of this procedure. Tighten 8mm
nuts to 2.3 Nm (20 in-lbs).
1
2
2
3
1
Top 8 mm nut (step 5)
2
Soft charge resistor
3
Bottom 8 mm nut (step 4)
9.2.8 Heatsink Thermal Sensor
1.
Remove power card mounting plate in
accordance with instructions.
2.
Remove soft charge mounting plate in
accordance with instructions.
3.
Remove heatsink thermal sensor by removing
screw fastener (T20) mounting sensor to heatsink.
Reinstall in reverse order of this procedure. Tighten T20
screws to 1.0 Nm (20 in-lbs).
9.2.9 SCR Modules
1.
Remove power card mounting plate in
accordance with instructions.
2.
Remove soft charge mounting plate in
accordance with instructions.
3.
Remove six nuts (13 mm), two from each SCR
module, on (+)DC bus bar.
4.
Remove two nuts (17 mm) (+)DC bus bar and
remove (+)DC bus bar.
5.
Remove six nuts (13 mm), two from each SCR
module, from AC input bus bar.
6.
If removing more than one SCR module, note
which gate lead attaches to which module.
Unplug gate lead from SCR module.
7.
Remove four mounting screws (T30) and washers
attaching SCR module to heatsink back panel.
Reassembly
1.
Replace SCR module in accordance with
instructions included with replacement module.
2.
Reassemble in reverse order of this procedure.
1
2
3
4
1
13 mm retaining nut (step 5)
2
17 mm retaining nut (step 4)
3
13 mm retaining nut (step 3)
4
SCR module
Disassembly/Assembly - Rect...
High Power Service Manual for Modular F Frame Drives
MG90K202 - VLT
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