Product Description:

The MPR5 DC power supply unit from Okuma belongs to the MPS Power Supplies series. The module converts three-phase mains into a stabilized DC bus that feeds Okuma servo amplifiers in machine tools and automated cells. By housing the regeneration resistor and control electronics in a single package, it streamlines cabinet layout. Within an automation rack, the unit provides bus energy, low-voltage logic power, and status signaling so axes and spindles remain synchronized under varying load. This arrangement keeps the central power section compact while the connected servo amplifiers regulate individual motors.

The supply delivers a continuous output of 5 kW. Its internal converter produces a stable DC bus at 300 VDC, while a separate logic rail provides 24 VDC for control circuits and interlocks. The low-voltage output supports relay logic and monitoring functions used by the drive system. Communication with the spindle and axis amplifiers is handled through a Converter Link interface, allowing fault codes and energy data to flow in real time. Protection circuitry trips if the input line exceeds 253 Vrms. Once power is removed, the capacitors must remain idle for 2 min before service access, and regenerated energy is dissipated through a resistor network rather than being fed back into the mains.

The front panel shows operating state on a 7-segment LED display, and there is no controller ID switch, so addressing is fixed by wiring. The housing measures 60 mm wide, 325 mm deep, and 380 mm high, which allows dense stacking beside inverters and I/O racks. The narrow body also leaves space for adjacent cable routing in crowded vertical panels. With a mass of 5.4 kg, the unit remains compact while the steel chassis still provides enough surface area for heat transfer required by the resistor regeneration method. Vent openings and terminals are arranged to suit top-entry control cabling in vertical panels.