Product Description:

The PSR3-230/75-21-205 is a dedicated servo power supply module produced by Kollmorgen for the PSR Servo Power Supplies series. It converts a three-phase mains input into a regulated DC bus that feeds Kollmorgen amplifier sections, forming the electrical backbone for multi-axis motion platforms in automated machinery. By stabilizing the intermediate circuit voltage and managing regeneration from connected drives, the unit maintains predictable energy flow between the utility line and motor inverters, which is critical for positioning accuracy and thermal balance in industrial automation cells.

Incoming line-to-line voltage is rated at 230 VAC, which is the permissible mains level that the rectifier stage can accept without additional transformers. After rectification, the supply establishes a nominal DC rail of 325 VDC, providing the reference potential for downstream servo amplifiers. Protective circuitry keeps the bus below its ceiling of 385 VDC to prevent overvoltage faults, while a recovery threshold of 365 VDC introduces hysteresis so the system does not cycle on and off during transient surges. Energy storage is handled by a capacitor bank totaling 0.0066 F, which smooths ripple current and supplies short bursts of power when multiple axes accelerate simultaneously.

The module delivers up to 75 A per phase to connected drives, allowing high peak currents for rapid torque development in servomotors. Thermal control relies on a fan-cooled chassis that directs airflow across heat-producing semiconductors to maintain rated output in enclosed cabinets. Because the module lacks internal regeneration hardware, excess kinetic energy is routed to a remote resistor network during motor deceleration. The recommended resistor absorbs 1,500 W and has a resistance of 2.31 ohms, converting surplus DC bus energy into heat during deceleration events. Adequate ventilation around the resistor is necessary because repeated braking cycles can produce substantial heat outside the power supply enclosure.