Braking unit for ATV900 drive systems
The VW3AP1102 is a braking unit accessory for the Altivar Process ATV900 drive family, sized for 315 kW size 1c systems with IP23 ingress protection. It functions as an electrical accessory for compact drive system braking — dissipating regenerative energy from decelerating motor loads through an external resistor bank, preventing DC bus overvoltage trips on the drive.
Sourcing constraint — enclosure requirement
The VW3AP1102 carries a condition of use: it cannot be ordered alone, only in combination with a standard enclosure. This means the braking unit ships as part of a pre-configured drive system package, not as a standalone component for field retrofit into an arbitrary cabinet. Lifecycle stage is listed as mature — the product is in steady-state production.
Integration into ATV900 drive systems
The braking unit is designed for integration with Altivar Process ATV900 compact drive systems at the 315 kW size 1c power level. It connects to the drive's DC bus terminals and controls an external braking resistor via a dedicated control signal from the drive. Because the unit requires a standard enclosure for ordering, the drive system package arrives pre-assembled with the braking unit installed. Field wiring to the external resistor is the primary installation step — verify resistor thermal capacity matches the duty cycle of the application (conveyor, crane, centrifuge, or other high-inertia load).