PSR3-230/75-25-203 Kollmorgen
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The Kollmorgen PSR3-230/75-25-203 is a power supply from the PSR Servo Power Supplies series, featuring a current rating of 75 Amps per phase and bus capacitance of 0.0066 F. It operates with a nominal DC bus voltage of 325 VDC and requires external regeneration, supporting a maximum external regen power of 2000 W.
Internal Product Review
The PSR3-230/75-25-203 is a Kollmorgen servo power supply with a 325 VDC nominal DC bus and a 75 Amps/phase current rating. External regeneration support and 2000 W maximum regen power make this unit a strong choice for servo systems with substantial braking energy demands.
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Product Description:
The PSR3-230/75-25-203 is a DC-bus supply in the PSR Servo Power Supplies series produced by Kollmorgen. Intended for multi-axis servo platforms, the module rectifies three-phase mains power and stabilizes the shared DC link that feeds coordinated drive stacks, allowing motion systems to alternate smoothly between motoring and braking operation. By providing controlled DC energy and managing regeneration thresholds, it forms the electrical backbone of packaging machines, gantries, and other automated equipment that require compact cabinet wiring and centralized bus management. The shared architecture also allows multiple connected axes to exchange energy through the common bus during simultaneous acceleration and deceleration cycles.
Its energy storage is provided by a bus capacitance of 0.0066 F, giving the link enough reserve to ride through brief line dips without disrupting axis regulation. Continuous distribution capability reaches 75 A per phase, so several drives can draw high acceleration currents simultaneously without overloading the source. During normal operation, the circuit maintains a nominal bus voltage of 325 VDC, while overvoltage protection trips at 385 VDC to protect downstream inverters. Regeneration control engages at 365 VDC, directing excess kinetic energy to the external braking circuit before the bus voltage reaches the protective trip threshold. The separation between the regeneration and trip levels provides a controlled range for dissipating returned energy during machine deceleration.
Because no braking transistors are built into the supply, the external regeneration arrangement requires a separate resistor stack. Kollmorgen permits a maximum resistor dissipation of 2000 W and requires a minimum resistance of 2.31 Ω for the assembly. These values limit braking current and thermal loading while allowing excess energy from decelerating motors to be dissipated outside the power supply enclosure. Applications with prolonged braking can use resistor packs sized for the system inertia and expected duty cycle. The resistor assembly can be positioned where sufficient airflow is available, while the power supply remains inside the main control cabinet. Proper resistor selection also helps prevent repeated overvoltage trips when several connected axes return energy to the shared bus at the same time.
