PC303250 Kollmorgen
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The Kollmorgen PC303250 servo drive is part of the SP Servostar Servo Drives series. It supports an application bus voltage of 325 VDC and delivers a continuous output current of 3 Arms. This unit has a peak output current of 9 Arms for 500 ms, a PWM frequency of 15.5 kHz, and weighs 1.61 kg.
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Product Description:
The PC303250 is a single-axis servo drive manufactured by Kollmorgen and supplied under the SP Servostar Servo Drives series. Within an automation cell, it converts power from a fixed DC link into pulse-width-modulated phase currents while coordinating motor torque and speed through encoder feedback. The unit forms the electrical interface between a motion controller and the mechanical load in indexing, conveying, or packaging applications. Its single-axis design allows one motor to be regulated independently within a larger automated system.
A DC bus voltage of 325 VDC feeds the power stage, and the internal capacitors reach their operating charge in 0.25 seconds, minimizing startup delays. During continuous duty, the inverter delivers 3 A RMS. Short bursts of up to 9 A RMS for 500 milliseconds accommodate acceleration peaks before thermal limits intervene. Current is synthesized at a carrier frequency of 15.5 kHz, reducing audible motor noise while preserving control bandwidth. Fault energy is routed to an external resistor bank, and the soft-start circuit restricts inrush current to 30 A to protect upstream supplies. Heat losses amount to 60 W under rated output, providing a basis for cabinet ventilation requirements. An internal logic supply eliminates the need for a separate 24 V source. Drive-enable or fault status can be connected through a dry contact that switches up to 1 A for basic interlocking.
Regenerative transients are absorbed by an external network rated for 200 W and fitted with a 20 Ω ballast resistor. This network prevents the DC link from exceeding its 430 VDC overvoltage threshold during motor deceleration. If the link falls below 90 VDC, the drive trips to prevent unstable operation. The drive also trips if the heat sink reaches 80 °C, protecting internal power components from excessive temperature. The design omits an integrated filter, leaving mains electromagnetic compatibility mitigation to external hardware. The 1.61 kg aluminum housing reduces the mounting load placed on the control panel while providing a rigid enclosure for the power and logic circuits.
