Product Description:

The DIGIFAS 7202-STEP is a compact digital servo amplifier produced by Kollmorgen as part of the DIGIFAS 7000 Servo Amplifiers series. Designed for step-and-direction motion commands, the unit converts a fixed three-phase mains supply into a regulated DC bus and controlled phase currents for synchronous or induction servomotors used in positioning axes and indexing stations. By integrating with machine controllers, the amplifier supplies the precise current and voltage modulation needed for repeatable motion in automated assembly and material-handling equipment.

During operation, the amplifier draws power from a nominal mains input of 3 × 400 V AC and rectifies it to a DC link held at 560 V DC. The current regulator closes its loop at 1 kHz, enabling rapid torque adjustments, while the output stage is pulse-width modulated at 8.33 kHz to minimize ripple. Under continuous load, it delivers 2.8 Arms, yet it can supply up to 5.6 Arms during acceleration. Protection is provided by an overvoltage threshold of 750 V, and the drive accepts motors with inductances no lower than 15 mH to keep current ripple within range. Setpoints arrive through a pulse-direction interface. Wiring is completed on a Mini Combicon 3.81 12-pin connector that accommodates conductors with a cross-sectional area of 1.5 mm².

The internal ballast circuit begins conducting at 720 V and can absorb regenerative power peaks up to 5.8 kW, preventing bus excursions during deceleration. The amplifier dissipates 15 W while quiescent and 45 W at rated current, and these values support enclosure cooling calculations for its 1.7 kVA connected load. Its overall dimensions are 275 × 71 × 235 mm, allowing side-by-side mounting on DIN rails without exceeding typical cabinet depths. The narrow housing leaves additional rail space for adjacent power, control, and communication equipment in densely packed multi-axis cabinets.