S7720A-SNF2-S3 Kollmorgen
Wake Industrial LLC is not an authorized distributor of this product.
The Kollmorgen S7720A-SNF2-S3 is an S700 Servo Drive with a rated current of 72 Arms and a voltage rating of 208 to 480V. It features dual channel STO capability, IP20 enclosure protection, and supports SynqNet with two RJ45 ports. The servo drive has a peak output current of 140 Arms for 5 seconds and includes coldplate and coated PCBs.
Internal Product Review
The S7720A-SNF2-S3 is a Kollmorgen S700 servo drive with a 72 Arms rated current and 140 Arms peak output current. Dual-channel STO and SynqNet communication give the unit strong appeal for safety-conscious, high-performance motion systems. High current capability stands out as the key advantage for dynamic servo applications.
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Product Description:
The S7720A-SNF2-S3 is a Kollmorgen servo drive positioned in the S700 Servo Drives series. Within an automated cell, the unit sits between the plant’s AC mains and a synchronous servo motor, modulating power so that commanded velocity and position profiles are executed accurately while protecting the motor windings. Its functionality extends to coordinating motion over a SynqNet network, allowing deterministic axis control and simplifying wiring through two RJ45 ports.
The power section accepts a wide operating input of 208 to 480 V, letting the same model serve both 230 V and 460 V installations. Under continuous loading, the inverter can source 72 A rms to the motor phases, and it can withstand a short-term demand of 140 A rms for five seconds, a margin used during rapid acceleration or heavy indexing. Line feeders must accommodate a draw of 50 kVA when the drive operates at full rating. Current is chopped at 8 kHz, which helps minimize torque ripple and audible noise. The housing carries an IP20 protection code, so the drive is mounted inside a control cabinet where access to live parts is restricted. Support electronics are powered from an auxiliary 24 VDC rail limited to 2 A, and an internal fan controller card plugs into the expansion slot to manage airflow over the cold plate and coated circuit boards.
The control loop remains stable with motor inductances down to 0.51 mH, matching low-reactance windings typically found in high-speed servomotors. During full-scale regeneration, the heat sink sheds 1005 W, a figure used for cabinet cooling calculations. Functional safety is provided by a dual-channel STO interface that removes drive energy without opening the main contactor. Additional 24 VDC outputs deliver up to 3 A for a holding brake, while the cold plate base and coated PCBs support cabinet installation where thermal management is important.
