Product Description:

The S7720A-PNF2-NA is a servo drive manufactured by Kollmorgen as part of the S700 Servo Drives series. It combines power conversion, feedback handling, and network communication so a matched motor can follow precise motion profiles in automated assembly cells, conveyors, and gantry systems. Two onboard PROFINET ports permit direct deterministic Ethernet control, while an auxiliary 24 VDC supply keeps the control electronics active during a mains loss and maintains fieldbus availability for an orderly shutdown.

The drive operates on line voltages from 208 to 480 V and draws a rated input of 50 kVA; this value is the maximum power the supply must furnish. At the motor terminals, it can deliver a continuous current of 72 Arms, with transients up to 140 Arms for acceleration. Minimum motor inductance at 480 V is 0.61 mH, which prevents excessive ripple current in low-impedance windings. Current is chopped at a switching frequency of 8 kHz, balancing audible noise against switching losses. The unit accepts fan and brake resistor accessories: a 10-ohm external resistor dissipates regenerated energy, and a dedicated expansion card governs a cabinet fan. Two RJ45 ports support 100Base-TX Ethernet traffic, enabling cyclic I/O and device diagnostics.

When mounted on a cold plate with coated PCBs, the drive’s heat sink fan starts at 80 °C and, under full load, internal losses reach 1135 W, which guides enclosure ventilation calculations. Integrated braking circuitry handles continuous dissipation of 8 kW. When higher peaks occur, the specified external resistor limits residual voltage to 6 V to help protect motor insulation. Safety is provided by the Dual channel STO function, which de-energizes the output stage through two independent paths to meet SIL requirements. An auxiliary 24 VDC feed keeps logic alive during STO events, while the PROFINET interface and fan controller remain energized for status reporting.