Product Description:

The S31061-FN is a servo drive produced by Kollmorgen within the S300 Servo Drives series. It interfaces between a PLC or motion controller and an AC servo motor to regulate torque, speed, and position in automated machinery. By converting incoming single-phase or three-phase mains power into a controlled DC bus and pulse-width-modulated output, the unit supplies precisely metered current to brushless motors used in packaging, material handling, or assembly cells.

On the power side, the drive accepts a wide mains window of 110...230 V, allowing installation on either 120 V or 208/230 V plant supplies without tap changes. At that input, it can draw up to 4 kVA and deliver a continuous phase current of 10 A rms while supporting momentary load spikes to 20 A rms. The internal converter raises the link circuit to 450 VDC, and if the bus reaches 455 VDC, an overvoltage trip opens the IGBTs to protect downstream devices. A minimum motor inductance of 1.9 mH is required so that the specified 3.3 kV/µs voltage rise stays within a safe di/dt range. When torque demand is low, the controller shifts to a 16 kHz reduced-current PWM mode, decreasing heat dissipation in the power stage.

Dynamic energy management is handled by an internal brake transistor capable of 50 W continuous dissipation through a 66 Ω resistor. For short decelerations, it tolerates up to 3 kW of pulse brake power, while heavier-duty axes can divert 1 kW to an external resistor bank. Current shaping is executed at a carrier frequency of 8 kHz, and hardware relay wear is limited to a switching rate of 30 cycles per hour. The integrated STO (Safe Torque Off) channel removes gate drive to the IGBTs without disturbing the control logic. Auxiliary electronics draw 2.5 A from a 24 VDC feed, and a controlled fan regulates heat sink temperature under sustained load.