Product Description:

The PSR3-208/50-06-003 is a three-phase servo power supply produced by Kollmorgen for the PSR Servo Power Supplies series. Intended for industrial automation, it rectifies 208 VAC line power and delivers the DC bus needed by servo amplifiers. The unit integrates filtering, energy storage, and regenerative handling so motion axes can draw or return power without separate modules. Its neon pilot indicator provides visible operating status for panel monitoring during machine operation.

It processes input through a full-wave rectifier and supports up to 50 A per phase on the three-phase line. The rectified energy appears on a 300 VDC bus that feeds connected servo drives. Bus stability comes from two electrolytic capacitors, each rated at 450 VDC, providing a combined filter capacitance of 4400 µF to minimize voltage ripple during rapid current transients. When the axis decelerates, excess charge is dissipated by an internal network rated at 10 W, helping prevent overvoltage during light regenerative events. A 5 A control fuse protects the logic supply, while a 30 A channel is reserved for an optional remote regeneration path. These protective channels separate control-circuit fault handling from the higher-current path used for external regenerative braking.

For heavier braking, the supply routes energy to a remote resistor that can absorb up to 600 W through a specified 4.5 Ω load. After shutdown, stored charge falls to a safe level according to a 44-second discharge time constant established by the 10 kΩ bleeder resistance, reducing the delay before the cabinet can be accessed. Fan-assisted airflow keeps the semiconductor devices within their operating limits during continuous duty, and the full assembly weighs 21 lb, allowing it to be mounted in a suitable industrial cabinet. The internal bleeder handles lighter regenerative events, while the remote resistor provides additional dissipation capacity during more demanding deceleration cycles.