S7720F-FBF2-NA Kollmorgen
Wake Industrial LLC is not an authorized distributor of this product.
The Kollmorgen S7720F-FBF2-NA is part of the S700 Servo Drives series and is rated for 208 to 480 volts input with a peak output current of 140 Arms. This servo drive features digital primary and analog secondary feedback topology and supports dual channel STO safety capability. The unit measures 505 mm in height, 190 mm in width, and 285 mm in depth with connectors.
Internal Product Review
The S7720F-FBF2-NA is a Kollmorgen S700 servo drive with dual channel STO and coated PCBs. Rated for 72 Arms with 140 Arms peak output, the drive offers impressive current headroom for demanding servo applications. A fan controller expansion card adds practical thermal management for high-duty operation.
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Product Description:
Kollmorgen’s S7720F-FBF2-NA belongs to the S700 Servo Drives series and functions as a digitally controlled power stage for synchronous motors used in positioning, packaging, and material-handling cells. The drive converts three-phase mains energy into regulated armature power while exchanging motion commands through EtherCAT or CANopen networks. It supports dual feedback, accepting a digital primary encoder plus an analog secondary signal to maintain closed-loop accuracy during rapid accelerations and load changes.
For dynamic axes, the drive can deliver a peak phase current of 140 Arms, while its continuous rating is 72 Arms; these two figures indicate short-term burst capability and steady thermal limits. The input side is sized for 50 kVA, so cabinet feeders and fusing must match that apparent-power demand. A wide supply window of 208 to 480 V allows operation on global plant voltages, and the internal IGBTs switch at a dv/dt of 4.0 kV/µs, a speed that minimizes distortion in the motor winding but requires shielded cabling to control electromagnetic noise. Encoder auxiliaries are supplied with 5 V DC, and a residual voltage drop of 6 V across the output stage is typical when the bridge is fully saturated. The drive also supports low-inductance motors and can be paired with selectable fan-controller expansion hardware that adjusts cooling airflow as current rises.
Mechanical packaging measures 190 mm wide, 505 mm high, and 285 mm deep with connectors installed; this footprint eases retrofit into standard 600 mm cabinets. At a 400 V bus, the heatsink releases 1005 W of loss, so forced ventilation from the add-on fan card is required to keep internal temperatures within component limits. Printed circuit assemblies are conformally coated for moisture resistance, matching the standard coated PCB option. Safe torque off is implemented with a dual-channel STO circuit to meet functional safety stop requirements, and motor compatibility extends to inductances down to 0.51 mH, ensuring stable current control on low-reactance coils.
