S7720A-SNF2-S4 Kollmorgen
Wake Industrial LLC is not an authorized distributor of this product.
The Kollmorgen S7720A-SNF2-S4 is a S700 Servo Drive that supports an input voltage range of 208 to 480V and offers a rated input power of 50 kVA. This drive, weighing 13 kilograms and standing 386 mm in height, features a peak output current of 140 Arms and a rated current of 72 Arms. It is equipped with dual channel STO safety, supports SynqNet fieldbus, and includes two RJ-45 network ports.
Internal Product Review
The S7720A-SNF2-S4 is a Kollmorgen S700 servo drive with a 208...480 V rating and 72 Arms rated current. SynqNet communication through 2 x RJ-45 ports supports clean network integration in motion systems. Dual-channel STO with SIL CL2 / PLd makes this unit an excellent choice for safety-focused servo applications.
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Product Description:
The S7720A-SNF2-S4 servo drive is manufactured by Kollmorgen and belongs to the S700 Servo Drives series. It supplies closed-loop control of brushless servomotors in packaging lines, robotics, and general motion systems by converting the plant’s three-phase mains into precisely metered motor current. The product integrates monitoring functions that support safety-oriented automation and routine status supervision during operation.
The drive accepts 208–480 V AC and, under continuous load, draws a rated current of 72 Arms while its power electronics can supply a peak of 140 Arms for short acceleration bursts. A converter front end sized for 50 kVA ensures that the DC bus has sufficient energy at maximum load. The output stage switches at 8 kHz, allowing high-bandwidth torque loops and minimizing audible ripple. During each transition, the devices impose a dv/dt of 4.8 kV/µs, so motor cabling must be selected accordingly. Motors connected to this model require at least 0.61 mH of phase inductance at 480 V to keep current ripple within tolerance. During standby, the electronics dissipate 24 W of quiescent heat, a value used when estimating base cabinet temperature rise.
At full load and 480 V, the drive produces 1135 W of loss heat, which the optional cold plate and coated PCBs help channel away from sensitive components. The device conforms to SIL CL2 / PLd and provides dual-channel STO for emergency torque removal without external contactors. A fan controller expansion card starts the integrated blower when the internal temperature reaches 65 °C, and acoustic output is limited to 68 dB(A). For networked motion, a SynqNet fieldbus interface is available through two RJ-45 ports. The housing measures 386 mm in height, 190 mm in width, and weighs 13 kg, dimensions that fit standard control enclosures while leaving room for wiring bends.
