Product Description:

The 8AC122.60-3 is a resolver interface module manufactured by B & R Automation for the 8AC Powerlink Modules series. Designed for industrial automation controllers, the unit converts analog resolver feedback into deterministic Powerlink data so that drive axes maintain electrical position accuracy across the network. By housing this function in a modular form factor, the part frees the central CPU from direct resolver conditioning while preserving real-time synchronization on the machine bus. This arrangement also supports distributed signal handling in multi-axis systems where stable timing between feedback acquisition and network exchange is important.

The module processes resolver signals within a bandwidth of 2.5 kHz, allowing it to follow mechanical speeds up to roughly 23,000 rpm before amplitude attenuation appears. Its differential input exhibits an impedance of 10.4 kΩ - j 11.1 kΩ, and the capacitive component shapes the phase lag so the analog sine and cosine remain within the permissible electrical error of ±10 angular minutes. Phase skew between channels is further bounded to ±45°, which helps prevent magnitude imbalance at the arctangent evaluator. A nominal transformation ratio of 0.5 ±10% matches standard two-pole BRX resolvers and supports full-scale digitization without saturating the A/D path. For cabinet thermal budgets, the device draws a maximum of 2.5 W, so multiple cards can share a passive backplane without forced ventilation.

In operation, the board slides into slots 2, 3, or 4 of the X20 rack, and its encoder monitoring feature continuously checks excitation amplitude, wiring breaks, and reference coherence. The module-side connector is a 9-pin female DSUB, and the resolver supply leaves the housing through a separate 2-pin header that can deliver up to 50 mAeff at the excitation frequency of 10 kHz. Differential signal transmission minimizes common-mode noise, and the separation of feedback and supply connections helps keep resolver wiring organized during installation. The BRX resolver type and the compact pin count also keep the interface easy to route in dense control cabinets.