Product Description:

Kollmorgen produces the S7720C-SEF2-PA as part of the S700 Servo Drives series. In industrial automation, the unit converts three-phase mains power into controlled armature voltage and current so that connected servo motors follow precise torque, speed, or position commands. The drive supports real-time coordination with PLCs over its SERCOS II fieldbus, allowing deterministic motion profiles across multi-axis machinery.

The power section accepts line voltages from 208...480 V and delivers a rated motor phase current of 72 Arms, with a peak capability of 140 Arms for transient acceleration. An output current form factor of 1.01 means the RMS value closely tracks the average, which helps limit additional heating. Semiconductor devices switch at 8 kHz, while mechanical contactors may toggle up to 30 times per hour without exceeding the allowable on/off switching rate. The cold plate option allows direct chassis heat sinking, and the dedicated fan controller expansion card modulates airflow so thermal dissipation stays at 24 W when the drive is disabled. A residual voltage drop of 6 V remains between the DC bus and motor leads during conduction. Functional safety is handled by dual-channel STO, which removes power to meet stop requirements.

The control section provides two differential ±10 V analog channels. The input path spans ±10 V with 20 kΩ impedance and updates in 62.5 µs, enabling tight torque loops. Outputs share the same ±10 V range and attain a resolution of 0.38 mV with a 250 µs refresh, supporting follower drives or process monitoring tasks. During nominal operation, the converter draws up to 50 kVA from the mains yet keeps airborne noise below 68 dB(A), which supports installation near operating areas. The analog interface also supports signal exchange with external control hardware during closed-loop operation.