S7720A-DNF2-PA Kollmorgen
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The Kollmorgen S7720A-DNF2-PA is an S700 Servo Drive featuring a rated input power of 50 kVA and a voltage rating of 208 to 480 volts. It has a rated current of 72 Arms and a peak output current of 140 Arms for 5 seconds. The drive provides dual channel STO safety, uses a coldplate with coated PCBs, and includes a fan controller expansion card.
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Product Description:
The S7720A-DNF2-PA is a servo drive produced by Kollmorgen within the S700 Servo Drives series. It serves as the power and control interface between a plant motion controller and a three-phase servo motor, providing regulated current, safety interlocks, and feedback processing for closed-loop automation. A cold-plate design and conformal coating on the circuit boards support installation in areas with limited airflow and airborne contaminants. Integrated fieldbus slots support distributed control schemes that help reduce wiring, and dual-channel STO provides certified torque isolation during service.
The control terminals accept an analog command range of ±10 V, and the same differential limit applies to the feedback inputs, allowing symmetric velocity or torque references without offset drift. An auxiliary logic supply of 24 VDC tolerates a +15 percent excursion and can draw up to 5 A for fans, I/O, and internal relays. The three-phase mains should be protected by an 80 A time-delay fuse. For short-term overloads, the power stage can deliver 140 Arms for five seconds to support rapid acceleration of low-inductance motors. A dedicated fan-controller expansion card manages cooling airflow, and rated input power reaches 50 kVA at the highest bus voltage.
During continuous operation, the drive supplies 72 Arms, which suits motors whose phase inductance is no lower than 0.61 mH at 480 VAC. The internal DC link operates across 290–675 VDC and is derived from line supplies between 208–480 V. Pulse-width modulation runs at 8 kHz to reduce ripple and audible noise during operation. At 480 VAC, the unit dissipates 1135 W of heat through the rear cold plate. Slot 1 supports DeviceNet networking, while Slot 3 accepts ROD/SSI emulation, master-slave synchronization, or additional analog I/O for coordinated multi-axis control.
Frequently Asked Questions about S7720A-DNF2-PA:
Q: What analog output voltage range is provided by the S7720A-DNF2-PA servo drive?
A: The S7720A-DNF2-PA supports an analog output voltage of ±10 V, suitable for precise analog control applications.
Q: Does the S7720A-DNF2-PA servo drive have Safe Torque Off capability?
A: This drive features dual channel Safe Torque Off (STO) capability for enhanced operational safety during maintenance or emergency stops.
Q: What is the peak output current capacity of the S7720A-DNF2-PA servo drive?
A: The S7720A-DNF2-PA accommodates up to 140 Arms of peak output current for up to 5 seconds, allowing for high-demand motion profiles.
Q: What is the voltage rating range for the S7720A-DNF2-PA servo drive?
A: With a voltage rating of 208 to 480V, this drive can be operated in a variety of industrial three-phase environments.
Q: How much rated input power does the S7720A-DNF2-PA servo drive require?
A: The rated input power is 50 kVA, supporting high power applications with significant electrical demands.
