S7720C-SEF2-NA Kollmorgen
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The Kollmorgen S7720C-SEF2-NA is a servo drive from the S700 Servo Drives series and is rated for 208 to 480 volts with a maximum input power of 50 kVA. It has a rated current of 72 Arms, features dual channel STO capability, and includes two analog inputs and four digital inputs. The servo drive includes a fan controller expansion card and has a max noise emission of 68 dB(A).
Internal Product Review
The S7720C-SEF2-NA is a Kollmorgen S700 servo drive with a 208...480V rating and 72 Arms rated current. Dual-channel STO and a coldplate configuration support safe integration and efficient thermal control in demanding motion systems. Peak output current of 140 Arms makes the drive an excellent fit for high-response servo applications.
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Product Description:
The S7720C-SEF2-NA is a servo drive produced by Kollmorgen for the S700 Servo Drives series. By transforming three-phase mains energy into controlled armature current, the unit drives high-performance servo motors in automated assembly cells, conveyors, and packaging lines. The drive’s design supports advanced safety and thermal options available throughout the series, while its cold-plate design simplifies mounting to chilled machine panels for improved heat removal. It also interfaces with a range of Kollmorgen motion controllers for flexible axis control without additional external power electronics.
On the input side, the drive is protected by an 80 A AC supply fuse and draws up to 50 kVA under full load. During continuous operation, the inverter delivers 72 Arms, while transient moves can be supplied with up to 140 Arms. An output current form factor of 1.01 keeps the RMS-to-average ratio of the delivered waveform close to sinusoidal, reducing copper losses in connected motors. The power stage works with servomotors whose phase inductance is as low as 0.51 mH at 400 V, and voltage drops across its IGBTs are limited to 6 V, helping maintain torque at low speeds. Command resources include two analog references and four digital inputs, and an internal fan-controller expansion card manages airflow when the unit is cabinet mounted.
For safe torque interruption, the drive incorporates a dual-channel STO circuit that eliminates external safety relays. When dynamic braking is required, the DC bus can be routed through a resistor protected by a 100 A fuse, limiting fault energy during emergency stops. The unit connects to three-phase mains from 208…480 V, giving a broad choice of supply transformers for global installations. At peak loading, it releases 1005 W into the cooling surface and the integrated fan path, yet airborne sound pressure remains at 68 dB(A), supporting in-machine placement in noise-sensitive plants.
