Product Description:

The S7720F-SEF2-NA is a servo drive manufactured by Kollmorgen in the S700 Servo Drives series. Mounted between facility power and a servomotor, it regulates phase current and executes fast control loops so automated equipment can hold position, accelerate smoothly, and follow motion profiles with minimal error. The unit interfaces with motion controllers over fieldbus links and supports safe torque-off inputs for machine safety circuits, providing a compact power stage for single-axis or multi-axis machinery.

It accepts a three-phase mains window of 208...480V and draws a rated input power of 50 kVA, converting it into controlled motor output. Continuous current capacity reaches 72 Arms, while short-term demand peaks at 140 Arms to cover rapid accelerations. Current ripple is limited by an output form factor of 1.01. The switching frequency of 8 kHz shapes the PWM waveform for motors with inductance down to 0.51 mH. The output stage has a residual voltage drop of 6 V, and the unit can absorb 50 kW of pulse brake energy during stops. An integrated fan-control expansion card manages cooling airflow and keeps noise to 68 dB(A). The unit contains coated PCBs for added resistance to moisture and airborne contaminants.

Thermal output at the heat sink is 1005 W, which is removed by the internal fan that the drive supervises. The voltage rise speed on the motor terminals is limited to 4.0 kV/µs to reduce insulation stress, and PWM edge control works with a dual-IGBT bridge. Safety is covered by the Dual channel STO function, which enables redundant torque shutoff without external relays. Device mass is 13 kg, which is relevant for cabinet rail loading and handling. When installed on a 400 V network, the drive maintains rated power as long as motor inductance remains above the minimum value.