S7720C-DNF2-S4 Kollmorgen
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The Kollmorgen S7720C-DNF2-S4 is a servo drive from the S700 Servo Drives series designed for operation at 208 to 480 volts and features a peak output current of 140 Arms for 2 seconds. It includes dual channel STO capability, a protection rating of IP20, and supports an installed load of 50 kVA at 480 volts. The drive provides 9 safe inputs and 6 safe outputs, uses a fan controller as an expansion card, and operates with a brake power of 8 kW at 480 volts.
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Product Description:
The S7720C-DNF2-S4 is a servo drive manufactured by Kollmorgen within the S700 Servo Drives series. It converts three-phase mains power into regulated motor current so machine axes can accelerate, brake, and hold position with precise electronic control. By integrating motion command processing, IGBT switching, and safety monitoring, the unit serves as the central power stage for packaging lines, gantry systems, and other automated equipment that demand fast torque response.
It operates from a three-phase bus within a range of 208–480 V; at this line level, the continuous output is 72 Arms, while short duty bursts of up to two seconds can reach 140 Arms to accelerate inertia without oversizing the drive. When the DC link charges and discharges during cycling, losses are limited to 1135 W, and the installation draws 50 kVA under maximum mechanical load. The enclosure carries an IP20 rating for cabinet mounting and includes a cold-plate base that transfers heat to external panels. A fan controller expansion card switches the integral blower once internal electronics climb past 65 °C, and the auxiliary 24 VDC rail, rated at 5 A, energizes the motor holding brake through dedicated terminals. DeviceNet connectivity supports 64 nodes through a 6 m stub with 120 Ω end-of-line termination, and a 10 Ω resistor is provided for external energy dumping.
To handle surplus kinetic energy, the drive channels up to 8 kW into the braking path, and full-speed cooling engages once the heat sink reaches 80 °C. Functional safety is delivered by a dual channel STO function that removes torque when its nine safe inputs and six safe outputs request it. The cold-plate surface assists the fan controller in removing heat, while the supervised 24 VDC brake circuit keeps the load immobilized during power faults.
