Product Description:

The S7720F-DNF2-NA servo drive is produced by Kollmorgen and belongs to the S700 Servo Drives series. It functions as the power and control stage for precision motion axes, converting incoming three-phase energy into controlled motor currents while exchanging status and safety signals with the automation controller. Typical applications include packaging stations, metal-cutting machines, and assembly robots where tightly regulated torque, speed, and position loops are required.

The drive accepts a supply range of 208…480 V AC, so it can be wired to standard plant distribution without additional transformers. Under nominal conditions, it handles 50 kVA of apparent power and delivers a continuous phase current of 72 Arms. For short acceleration bursts, the output rises to 140 Arms, giving the connected motor extra torque headroom. Internal IGBT modules switch at 8 kHz, which limits motor-side ripple while keeping switching losses manageable. A permitted on/off rate of 30 cycles per hour prevents excessive inrush stress, and the integrated dual-channel STO function removes drive torque for functional safety without cutting main power. Cooling airflow is managed through an expansion card that governs the cabinet fan, and the electronics are supplied with standard and coated PCBs to improve resistance to humidity and airborne contaminants. Physical dimensions measure 190 mm in width, 285 mm in depth, and 505 mm in height, fitting common 600 mm control enclosures.

Regenerative energy produced during braking is directed to an external circuit rated at 8 kW and dissipated through a matching 10 Ω resistor, preventing DC bus overvoltage. When the axis is disabled, the unit releases only 24 W of heat, minimizing standby ventilation requirements. Full-load acoustic output reaches 68 dB(A), allowing coexistence with other cabinet equipment. Overall mass is 13 kg, which suits panel-mounted installation.