PSR4/5A-212-9181 Kollmorgen
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The Kollmorgen PSR4/5A-212-9181 is a power supply with regen for BDS and ACS systems, part of the PSR Servo Power Supplies series. It has a current rating of 12 Amps per phase and supports a maximum axis capacity of 2. The unit operates with a voltage rating of 230 VAC, a logic supply unit of 240 V, and delivers an output power of 3.6 kW.
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Product Description:
The PSR4/5A-212-9181 is a servo-drive power module produced by Kollmorgen for the PSR Servo Power Supplies series. It converts incoming three-phase AC power into a regulated DC bus for compatible BDS and ACS motion systems. The module can supply as many as two drive axes, providing a common electrical source for coordinated positioning, material-handling equipment, and other industrial automation applications. Its shared DC bus can receive energy returned by decelerating motors, although the module cannot actively return that energy to the mains.
The supply operates from a nominal input of 230 VAC on a three-phase network and accepts frequencies from 47–63 Hz. At full load, it delivers up to 3.6 kW of output power, while each motor phase supports a continuous current of 12 A per phase. These electrical characteristics allow connected servo amplifiers to receive stable power during acceleration and changing load conditions. A separate 240 V logic supply powers the internal control electronics and allows status circuits to remain active when the main power stage is disabled. This arrangement separates low-power control functions from the motor power path.
The internal rectifier and filter produce a DC-link voltage of 310 VDC, and conversion losses result in up to 60 W of heat dissipation. During startup, a soft-charge circuit limits inrush current to 80 A and completes precharging in 0.25 seconds, reducing electrical stress on upstream protection devices. The module does not include active mains-regeneration hardware, so an external dump resistor may be needed when returned energy exceeds the capacity of the shared DC bus. It is supplied without a connector kit, which means the required field-wiring accessories must be obtained separately. The two-axis capacity allows both connected drives to draw power from the same DC link while retaining independent motor control through their respective servo amplifiers.
