Product Description:

The DC-SA1 is a regulated power module manufactured by Okuma as part of the DC Power Supplies series. It converts plant mains into a controlled direct-current link that feeds compatible servo amplifiers, allowing brushless servo axes to accelerate and decelerate in a coordinated manner inside automated machining centers and handling equipment. This regulated link helps the connected motion system maintain stable axis response during rapid load and speed changes.

This supply is designed for a three-phase input so the rectifier can draw balanced current from each line and reduce ripple on the DC bus. Its output remains DC because servo inverters subsequently create the variable AC waveforms for the motors. Okuma rates the unit for 2 axes; the internal bus capacitance and current paths are sized so that two amplifiers can regenerate or consume energy without excessive voltage swing. A protective high-energy shutdown engages at 430 V on the bus to guard the drives and motor insulation, while an automatic low-voltage cutoff at 200 V prevents undervoltage faults that would disturb torque production during acceleration or when the mains sag.

Status and diagnostic feedback is provided through LED indicators labeled PH/LV/HV/OVER DIS, giving clear information on phase loss, low bus voltage, high bus voltage, and over-discharge events. The supply links directly to Okuma’s BL-D15A/30A/50A/75A/150A servo amplifiers, ensuring that gate-drive timing, regeneration paths, and fault signaling are standardized across the motion system. It supports brushless servomotor technology, which relies on a smooth DC rail for precise current control. Power leaves the module through the dedicated VH/VL terminal pair so cabling resistance can be calculated and fused correctly. Each servo amplifier connects to exactly one motor, matching the design guideline of one motor per amp, which simplifies fault isolation and thermal modeling.