S7720C-EIF2-NA Kollmorgen
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The Kollmorgen S7720C-EIF2-NA is an S700 Servo Drive with a rated current of 72 Arms and operates at a voltage rating of 208 to 480 volts. This drive, part of the S700 Servo Drives series, features 14 digital inputs, 8 digital outputs, and a dual channel STO safety function. It has a rated input power of 50 kVA and uses a coldplate option for thermal management.
Internal Product Review
The S7720C-EIF2-NA is a Kollmorgen S700 Servo Drive with a 208...480V rating and a coldplate configuration. Rated for 72 Arms and an 8 kHz switching frequency, the drive delivers strong control authority and smooth motor performance in demanding motion systems. Dual-channel STO and fan-controller expansion support make the unit a well-balanced choice for safety-focused servo applications.
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Product Description:
The S7720C-EIF2-NA is a Kollmorgen servo amplifier from the S700 Servo Drives series, built for axis control in multi-axis automation cells. It modulates three-phase power from 208 to 480 VAC into precise current for synchronous or induction motors while monitoring safety, I/O, and thermal states inside its cold-plate housing. Within a motion system, the unit closes the velocity and position loops, distributes fieldbus telegrams, and protects connected hardware through integrated dual-channel safe-torque-off circuitry.
An Ei addressing time of 4 ms lets the drive register I/O state changes quickly, and its output stages can react in 10 ms to commands from the application controller. Power transistors switch at 8 kHz, a carrier frequency that balances audible noise with current ripple. The power section supplies a continuous phase current of 72 Arms, supporting stable torque on high-inertia loads, and the DC link can draw up to 50 kVA under rated conditions. Mains connection is permitted within 208 to 480 V, so the drive can be used on common industrial grids. A starting delay of 2 ms prevents nuisance trips during bus pre-charge, and a fan-controller expansion card governs airflow to maintain semiconductor temperature without external relays.
The safety block implements dual-channel STO, allowing independent monitoring contacts to remove gate drive when either channel opens. For branch-circuit protection, the cabinet fuse must not exceed 80 A, while the internal electronics protect signal wiring with a 4 AT miniature fuse. Machine feedback is handled through 14 digital inputs, supporting step-change recipes, mode selection, and local diagnostics without a separate PLC card. Eight digital outputs rated at 24 V/500 mA can drive relays or opto-isolators, and the switch-on and switch-off limit of 30 operations per hour restricts thermal cycling of the cold plate to predictable intervals.
