1.
Remove the capacitor banks in accordance with
the procedure.
2.
Note the IGBT signal cables connected between
the gate drive card connectors MK100
(temperature sensor), MK102 (U), MK103 (V) and
MK104 (W) and the IGBTs for reassembly (not
shown). Disconnect the cables at the connectors
on the IGBT modules.
3.
Remove the 12 (T-25) retaining screws (6 on each
module) on the lower portion of the IGBT
modules. These screws also attach the snubber
capacitors to the IGBT modules. Remove the
snubber capacitors.
4.
Remove the four (0.51 in [13 mm]) retaining nuts
at the bottom of the IGBT bus bar assembly.
5.
Remove the IGBT bus bar assembly.
6.
At the top end of the IGBT module, remove the
12 (T-25) retaining screws (4 each for the U, V
and W intermediate IGBT output bus bars).
7.
Loosen the retaining nut (0.32 in [8 mm]) from
the three intermediate IGBT output bus bars to
provide access to IGBTs.
8.
Remove the screw (T-30) on the top end of the
intermediate IGBT bus bar to allow access to the
IGBT module for removal.
9.
Note that a Mylar shield covers lower 8 retaining
screws. Take proper care to avoid damage to the
shield. Remove the two IGBT modules by
removing the 16 (T-25) screws (8 per module)
and sliding the modules free from under the bus
bars.
10.
Clean the heatsink surface with a mild solvent or
alcohol solution.
Reassembly
1.
Replace the IGBT module in accordance with the
instructions provided with the replacement kit.
Note that tightening pattern and torque values
described in kit must be complied with.
2.
Reassemble the remaining parts in reverse order
of their removal.
See
for torque tightening values.
E-Frame Sizes Disassembly a...
VLT Advanced Active Filter AAF006 D and E Frames Service Manual
8-16
MG90Z122 - VLT
®
is a registered Danfoss trademark
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