S7720C-PNF2-NA Kollmorgen
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The Kollmorgen S7720C-PNF2-NA is an S700 Servo Drive that operates with a voltage rating of 208 to 480 volts and supports a dc bus voltage range of 290 to 675 VDC. It features dual channel STO capability, a peak output current of 140 Amps for 5 seconds, and a rated current of 72 Amps. The drive comes with Profinet connectivity via dual RJ45 ports and includes an 80 Amp AC supply fuse.
Internal Product Review
The S7720C-PNF2-NA is a Kollmorgen S700 servo drive with dual RJ45 Profinet ports for straightforward network integration. A 72 Arms rated current and 140 Arms peak output current give the drive impressive control authority for demanding servo applications. Dual-channel STO is a standout feature for safety-focused motion systems.
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Product Description:
The S7720C-PNF2-NA belongs to the S700 Servo Drives series manufactured by Kollmorgen. As a drive controller, it supplies regulated current and voltage to brushless servo motors so that torque, speed, and position can be commanded precisely in automated machinery. A cold-plate heat sink option adds mechanical flexibility for panel mounting, and the F2 auxiliary fan engages when ambient temperature rises above 65 °C to maintain thermal stability.
The unit accepts a three-phase input range of 208 … 480 V and internally boosts it to a DC bus range of 290 – 675 VDC. Under continuous load, it delivers 72 Arms, while a peak of 140 Arms can be sustained for 5 seconds to manage rapid acceleration events. The supply must be protected by an 80 A AC fuse, and the front end can draw up to 50 kVA when the drive is fully loaded. Pulse-width modulation is generated at an 8 kHz switching frequency, and the input line can operate at standard 50 or 60 Hz. Motors connected to this model should present at least 0.51 mH of phase inductance at 400 V so that current ripple stays within safe limits.
An external brake circuit rated for 8 kW can be attached through the provided terminals, and an integral 10 Ω brake resistor helps dissipate regenerated energy during fast stops. Functional safety is addressed with dual-channel STO, allowing immediate torque removal without opening the main contactor. For real-time communication, the drive offers dual RJ45 ports for Profinet; each port supports 100Base-TX traffic over Category 5 or better cabling so that the controller can be placed in line or at the end of an industrial Ethernet segment. A plug-in fan-controller expansion card coordinates both the cold-plate loop and the enclosure fans to balance noise, efficiency, and temperature.
