The VW3A66822 is a vent fan kit for Altivar ATV66 variable speed drives, sized for frame sizes 2 and 3. It runs on a 24 V DC supply and is intended for the ATV66U90N4 through D23N4 (400 V class) and ATV66U72M2 through D16M2 (240 V class) drive models.
Deployment context
This fan kit mounts inside the ATV66 drive enclosure to provide forced-air cooling for the power stage. The 24 V DC supply means it draws from the drive's control power bus rather than the mains — a detail that matters when sizing the control transformer or backup supply for the panel.
