PSR3-208/50-08-003 Kollmorgen
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The Kollmorgen PSR3-208/50-08-003 is a servo power supply from the PSR Servo Power Supplies series designed for a 3-phase input voltage of 208 VAC and a current rating of 50 Amps per phase. It provides a DC bus voltage of 300 VDC, uses bus capacitors rated at 2 x 2200 microfarads, and includes a 10 kilohm bleeder resistor with a 10 W bleeder power.
Internal Product Review
The PSR3-208/50-08-003 is a Kollmorgen servo power supply designed for 3-phase 208 VAC input. A 50 Amps/Phase current rating and 300 VDC bus give this unit excellent headroom for demanding servo applications.
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Product Description:
The PSR3-208/50-08-003 is a regulated power module built by Kollmorgen for the PSR Servo Power Supplies series. As a shared supply for multiple servo drives, it rectifies incoming three-phase mains power, filters the resulting DC power, and routes braking energy so motion axes can accelerate and decelerate without causing an overvoltage condition. By serving as a centralized source for the DC bus, the unit reduces cabinet wiring and maintains consistent voltage for the connected amplifiers in industrial automation systems.
The supply accepts an input of 208 VAC from a three-phase feed, allowing direct connection to compatible plant power systems. Each line can carry up to 50 A per phase, which is the maximum continuous input current the module can draw while remaining within its thermal limits. After rectification, the internal filter establishes a stabilized bus voltage of 300 VDC for compatible Kollmorgen servo amplifiers. Energy storage is provided by two 2200 µF capacitors, which smooth DC ripple and supply burst current during rapid torque commands. A 110 VAC auxiliary circuit powers the control relays, while a 5 A auxiliary fuse isolates faults in that low-power branch without interrupting the main bus.
When the connected motors brake, excess energy is diverted through internal and external resistor paths. The main capacitors discharge with a time constant of 44 s, allowing the residual bus voltage to decay over a measurable interval after power is removed. The permanent bleeder network uses a 10 kΩ resistor rated to dissipate 10 W, gradually removing the remaining charge during standby. For dynamic braking events, an optional external resistor of 4.5 Ω is protected by a 30 A fuse. An internal 7.5 Ω resistor with a 15 A fuse handles smaller energy surges and helps keep the DC bus below the capacitors’ 450 V rating.
