Igbt Current Sensors Ct1, Ct2, And Ct3; Damping Resistors; Fan Transformer; Fan - Danfoss VLT AAF006 Service Manual

D-Frame Sizes Disassembly a...
NOTE!
Note that for ease of access, the input terminal mounting
plate may be removed prior to this procedure.
1. Remove the capacitor bank assembly in
accordance with the procedure.
2. Disconnect the gate leads MK100, MK200, MK300
and the thermal sensor MK10 from the IGBT
module.
3. Remove the IGBT snubber capacitors and DC bus
assembly by removing the six retaining screws
(T-30) from the bottom terminals of the IGBT
module.
4. At the top of the IGBT module, remove the six
(T-25) retaining screws (two each for the U, V,
7 7
and W intermediate IGBT output bus bars.
5. Remove the nut (0.51 in [13 mm]) connecting the
current sensor bus bar to the intermediate IGBT
bus bar.

7.3.8 IGBT Current Sensors CT1, CT2, and CT3

1. Remove the input terminal mounting plate in
accordance with the procedure.
2. Remove the nuts (0.51 [13 mm]) from both ends
of the current sensor bus bar.
3. Remove the retaining nut (0.32 [8 mm]) from the
current sensor standoff.
4. Disconnect the current sensor cable (not shown).
5. Remove the current sensor by removing the
retaining nuts (0.32 in [8 mm]), one on each side
of the current sensor.
Reinstall in the reverse order of this procedure. See
Table 1.7 for torque tightening values.

7.3.9 Damping Resistors

1. Remove the input terminal mounting plate in
accordance with the procedure.
2. Remove the damping resistor bus bars by
removing the screws (T-20).
3. Remove the damping resistor by removing the
screws (T-20) on either side of the damping
resistor.
Reinstall in the reverse order of this procedure. See
Table 1.7 for torque tightening values.
7-14
VLT Advanced Active Filter AAF006 D and E Frames Service Manual
6.
7.
8.
9.
Reassembly
1.
2.
See Table 1.7 for torque tightening values.

7.3.10 Fan Transformer

1.
2.
3.
Reinstall in the reverse order of this procedure. See
Table 1.7 for torque tightening values.

7.3.11 Fan

1.
2.
3.
Reinstall in the reverse order of this procedure. See
Table 1.7 for torque tightening values.
®
MG90Z122 - VLT is a registered Danfoss trademark
Remove the IGBT intermediate bus bar by
removing the retaining nut (0.32 in [8 mm]).
Remove the IGBT module by removing the eight
mounting screws (T-25).
Note that a Mylar shield covers the lower eight
retaining screws. Take proper care to avoid
damage to the shield. Remove the IGBT module
by removing the eight screws (T-25).
Clean the heatsink surface with a mild solvent or
alcohol solution.
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.
Reassemble the remaining parts in reverse order
of their removal.
Disconnect the line power input cabling from
terminals L1, L2, L3, and the ground connector.
Disconnect the inline connector from the fan
transformer (not shown).
Remove the fan transformer by removing the nut
(0.51 in [13 mm]) in the center of the fan
transformer.
Disconnect the line power input cabling from
terminals L1, L2, L3, and the ground connector.
Disconnect the Molex connector from the fan
assembly.
Remove the fan assembly by removing six nuts
(0.39 in [10 mm]).