176F3502 by Danfoss

The 176F3502 is a replacement power electronics sub-assembly produced by Danfoss for the VLT PowerCards series of drive products. As a power card, it mounts inside a VLT medium-voltage or low-voltage drive stack and carries the insulated-gate transistors, gate drivers, and sensing circuits that convert line power into a regulated three-phase output for induction or permanent-magnet motors used in pumps, compressors, and conveyors. Replacing the card instead of the entire drive can restore operation quickly while retaining existing field wiring. This approach also preserves the existing cabinet arrangement and avoids unnecessary changes to surrounding drive hardware.

The card is designed for motors fed from a three-phase power supply and can handle drive systems rated up to 400 kW, so it supports large HVAC fans or high-horsepower process pumps. With a volume of 14.267 dm³, it fits the mechanical envelope of VLT cabinets without requiring panel modifications, while the matched gross and net weight of 1.5 kg supports straightforward handling during installation. An input voltage code of 7 identifies compatibility with the corresponding rectifier section and indicates the intended AC line class. These electrical and dimensional values help verify enclosure clearance, thermal loading, and system fit before installation.

The printed circuit board surface has a coated and ruggedized finish, adding conformal protection and mechanical reinforcement to tolerate conductive dust and vibration inside industrial enclosures. The assembly is classified as a Power Card, so all power-stage components are populated and the unit can be installed as a complete replacement. The protective finish helps reduce contamination across sensitive traces, and the reinforced board structure helps resist stress from continuous machine vibration. Its layout matches the intended VLT platform and supports standard diagnostic access through the drive system without requiring changes to the existing cabinet layout.