S7720C-DNF2-F2 Kollmorgen
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The S7720C-DNF2-F2 is an S700 Servo Drive manufactured by Kollmorgen, featuring a rated input power of 50 kVA and a voltage range of 208 to 480 volts. It offers a peak output current of 140 Arms, a rated current of 72 Arms, and 2 analog inputs with a resistance of 150 kΩ. The drive supports an auxiliary supply voltage of 24 V DC, dual channel STO, and includes a fan controller expansion card.
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Product Description:
The S7720C-DNF2-F2 is a servo drive manufactured by Kollmorgen as part of the S700 Servo Drives series. Installed between a motion controller and a three-phase servomotor, it modulates current and voltage so that industrial axes follow commanded speed or torque profiles with high fidelity. This unit is used in automation cells where deterministic motor control improves throughput and positioning accuracy.
Two differential analog command channels are available; each channel presents an input resistance of 150 kΩ, protecting upstream sources from excessive load. The converter samples these signals every 62.5 µs, allowing rapid loop updates that support high-bandwidth motion tasks. Reference levels from process controllers can swing to ±10 V, letting the drive interpret full-scale velocity or torque commands without signal conditioning. Internal logic and feedback electronics are powered by an auxiliary rail of 24 V DC, which also feeds relay coils for the four digital inputs and two digital outputs. When an axis accelerates or encounters a transient load, the inverter can supply up to 140 Arms of peak current, giving machines short-term torque reserves for quick starts or shock rejection. A plug-in fan-controller expansion card manages external blowers, and the built-in coldplate allows the drive to mount directly on a liquid-cooled surface, lowering panel temperatures.
During continuous production, current delivery is limited to 72 Arms so thermal ratings are not exceeded. The power stage connects to three-phase mains from 208…480 V, and its input side is engineered for installations that draw up to 50 kVA. A carrier frequency of 8 kHz minimizes motor audible noise while keeping switching losses manageable. For functional safety, a dual-channel Safe Torque Off circuit removes drive energy without mechanical relays. Four optically isolated digital inputs accept sensors or PLC signals, and two sourcing outputs report drive status. The built-in coldplate spreads heat into machine frames, and the fan controller keeps airflow proportional to demand.
Frequently Asked Questions about S7720C-DNF2-F2:
Q: What is the rated current output of the S7720C-DNF2-F2 servo drive?
A: This model supports a rated current of 72 Arms for continuous operation.
Q: What is the peak output current provided by the S7720C-DNF2-F2?
A: The S7720C-DNF2-F2 can handle a peak output current of up to 140 Arms.
Q: What input voltage range is compatible with the S7720C-DNF2-F2?
A: The servo drive accepts an input voltage range between 208 and 480V.
Q: How many analog inputs does the S7720C-DNF2-F2 include and what voltage do they support?
A: This drive features two analog inputs, each supporting ±10 V.
Q: Does the S7720C-DNF2-F2 offer Safe Torque Off (STO) functionality?
A: Dual channel Safe Torque Off (STO) capability is integrated into this model.
