Product Description:

The PSR3-230/75-21-206 is a servo power supply module produced by Kollmorgen for the PSR Servo Power Supplies series. It converts three-phase mains power into a stabilized DC link that feeds compatible Kollmorgen servo amplifiers. This arrangement allows multiple motion axes to share a common power bus within the same control cabinet. By maintaining the DC voltage within its prescribed operating range, the module supports rapid energy exchange between connected drives during acceleration and braking. The common-bus arrangement also reduces the need for separate power conversion equipment for each servo axis.

The supply is rated for 75 A per phase, which is the maximum continuous line current available when the module supports several servo drives. Its onboard energy storage has a capacitance of 0.0066 F, which smooths the rectified mains voltage and dampens regenerative spikes that could otherwise propagate through the bus. Under nominal load, the converter establishes a 325 VDC bus for the connected amplifiers. Protective circuitry permits temporary voltage excursions up to 385 VDC before activating the crowbar circuit or fault logic. These operating thresholds allow connected drives to return kinetic energy to the shared link without exceeding the insulation limits of downstream equipment. Control wiring, status signaling, and mounting provisions are arranged to support integration with other products in the same motion-control system.

The module can route up to 2000 W of excess regenerative energy away from the shared power link. Its braking hysteresis engages at 365 VDC, initiating energy dissipation when the bus voltage reaches that level. Regenerative management requires an external braking resistor because the module does not contain an internal regeneration stage. The control cabinet must therefore provide suitable mounting space, wiring, and ventilation for the resistor assembly. Keeping the braking resistor outside the module reduces the amount of regenerative heat generated within the power supply enclosure. The module continuously monitors the entire DC bus and uses its regulation logic to keep voltage within the permitted hysteresis range during rapid load reversals. Consistent connector placement supports orderly routing of power, control, and status conductors inside the cabinet.