Danfoss VLT Series Service Manual page 30

Section Four
REMOVING & REPLACING
THE ILD CARD, DC CARD,
RECTIFIER CARD AND IGBT
4 - 2
VLT 3002-3004, 230V
VLT 3002-3008, 380V/460V
ILD Card:
1. Remove the ground screw(s) on the ILD Card. The screws are located at
the bottom and possibly at the top right on the board.
2. Remove all wire harnesses from the ILD Card. The three leads connecting
the ILD Card to the motor coils may need to be removed from the Motor Coil
side. The replacement ILD Card will show if these leads should be
disconnected from the ILD Card or from the Motor Coils. Pay close attention
to the orientation and routing of these wire leads.
3. Use the tip of a flat-head screw driver to release the ILD Card from the
plastic mounting clips and lift the card upward.
4. To install, make sure that the Insulation Foil is in place.
5. Connect the ILD Card to Motor Coil wire leads.
6. Reverse the rest of the installation steps.
DC Card:
1. Remove the wires connecting the DC Card to the Bus Coil and the IGBTs.
2. Remove the mounting screws and the green/yellow ground lead.
3. Use the tip of a flat-head screw driver to release the DC Card from the
plastic mounting clips and lift the card upward. This may require a little flexing
of the side of the enclosure to accomplish.
4. Remove the wires connecting the DC Card to the rectifier module and remove
the DC Card.
5. Reverse the steps above to replace.
Rectifier Module:
1. Remove the wire harness from the module terminals. Note the wire
orientations.
2. Remove the two mounting screws and remove the module.
3. Clean the thermal grease from the enclosure heatsink and from underneath
the Rectifier Module.
4. Install the wire harness to the module.
5. Apply silicon grease 3 mils thick to the entire base of the Rectifier Module.
6. Secure the Rectifier with the two screws. Torque to 12-14 LB-IN (1.5Nm).
VLT 3502-3504, 230V
VLT 3502-3511, 380V/460V