S7720C-SEF2-S3 Kollmorgen
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The Kollmorgen S7720C-SEF2-S3 is an S700 Servo Drive series product with a rated current of 72 Arms and voltage rating of 208 to 480 Volts. It has a rated input power of 50 kVA and features a dual channel STO capability. This drive measures 386 mm in height and 190 mm in width, and it weighs 13 kilograms.
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Product Description:
The S7720C-SEF2-S3 is a Kollmorgen servo drive in the S700 Servo Drives series. As an intelligent power stage, the unit regulates the current and voltage supplied to synchronous or induction motors for coordinated motion tasks in industrial automation cells. The housing integrates network safety and fieldbus options so the drive can be mounted close to the machine cabinet and connected directly to the plant mains. It is intended for precise speed, torque, and positioning applications rather than simple fixed-speed motor operation. This arrangement supports distributed axis layouts in which power conversion and communication functions are kept in one enclosure.
The drive handles a continuous output of 72 Arms at the motor terminals while drawing up to 50 kVA from three-phase mains between 208–480 V. Its insulated-gate power section switches at 8 kHz, a frequency that balances torque ripple with switching losses. A dual-channel STO circuit is integrated for immediate torque removal when either channel is interrupted, meeting functional safety stop requirements. Additional parameters include a switching rate of 30 cycles per hour, a residual DC-link voltage drop of 6 V, and a housing width of 190 mm that supports side-by-side mounting in crowded enclosures. The height without connectors is 386 mm, and the total mass is 13 kg.
With connectors removed, the enclosure depth measures 244 mm, allowing installation against the rear panel when a cold plate thermal option is selected to move process heat to an external surface. When the drive is disabled, its internal circuitry dissipates only 24 W, and acoustic emission remains below 68 dB(A) at full electrical load. Slot 1 is factory configured as SERCOS II, and the expansion card bay carries a fan controller that modulates cabinet airflow according to IGBT temperature rise. The temperature-responsive airflow control helps the enclosure cooling system react to changing thermal load instead of operating at one fixed fan speed. That behavior can reduce unnecessary airflow when the power devices are under lighter demand.
Frequently Asked Questions about S7720C-SEF2-S3:
Q: What is the rated current of the S7720C-SEF2-S3 servo drive?
A: The S7720C-SEF2-S3 servo drive supports a rated current of 72 Arms for operation.
Q: What safety feature regarding torque does the S7720C-SEF2-S3 include?
A: This drive features a dual channel STO (Safe Torque Off) capability.
Q: Which communication interface is built into slot 1 of the S7720C-SEF2-S3?
A: The S7720C-SEF2-S3 uses the SERCOS II interface in slot 1.
Q: How much noise does the S7720C-SEF2-S3 servo drive emit under maximum operation?
A: A maximum noise emission of 68 dB(A) is produced during operation.
Q: What cooling or thermal management option is available on the S7720C-SEF2-S3 servo drive?
A: The S7720C-SEF2-S3 features a coldplate option as detailed in its configuration.
