Danfoss VLT Series Service Manual page 32

Section Four
REMOVING & REPLACING
THE INTERFACE CARD,
RELAY CARD, RECTIFIER,
AND IGBT
4 - 4
VLT 3006-3022, 230V
VLT 3011-3052, 380V/460V
To gain access to some assemblies remove the Control Card (page 4-2). It may
also be necessary to remove one of the enclosure cross support braces to gain
access to components on some units.
Interface Card:
1. Remove all wire harnesses from the Interface Card.
2. Remove the ground screw from the top right-hand corner, (on units without
Interface Card ground wire).
3. Note in which enclosure slot the left side of the interface card was
mounted. Use the tip of a flat-head screw driver to release the right side of
the Interface Card from the plastic board supports and lift the board out of
the unit.
4. Remove and inspect the Interface Card Insulation Foil, (not on 230V units).
5. Replace the Insulation Foil.
6. Slide the left-hand side of the Interface Card in the appropriate enclosure
slot and snap the right-hand side of the plastic board supports. Make sure
that all wire harnesses are accessible prior to seating the Interface Card.
7. Re-connect all wire harnesses and the ground screw.
Relay Card:
1. Remove all wire harnesses from the Relay Card.
2. Release the Relay Card from all plastic mounting clips and remove. Use
the tip of a flat-head screw driver for the black plastic clips and needle nose
pliers if white plastic stand-offs are used.
3. For units with the current sensors mounted on the Relay Card, note the
wire labeling and orientation prior to moving the board. Remove the three
leads connected to the drive side of the motor terminal strip and feed the
leads back through the current sensors.
4. Reverse the steps above to replace.
VLT 3508-3532, 230V
VLT 3516-3562, 380V/460V