Product Description:

The MIV0204-1-B5 is an inverter unit in the MIV Servo Drives series produced by Okuma. It is intended to interface with BL and PREX servo motors to deliver regulated three-phase power and regenerative braking control in CNC machines and other automated equipment. By managing DC bus energy and converting it into variable-frequency output, the unit allows precise speed and torque regulation for positioning axes and spindle drives. This arrangement also supports smooth reversals and controlled deceleration during repeated machine cycles.

It draws a control supply of 24 VDC, which energizes the internal logic, relays, and cooling fans independently from the main power stage, so parameter memory and diagnostics remain active even during a line power shutdown. The power section links to a common DC bus held at 300 VDC; this voltage comes from the upstream converter and is switched by the IGBT bridge to feed the connected motor phases. Because the inverter works from a shared DC source, it can respond quickly to load changes while remaining coordinated with the rest of the drive system. On the low-power spindle or feed axis, the L side of the drive can continuously deliver 2.0 kW, or 2.67 HP. The M side supports a rated output of 4.0 kW for higher-duty loads. These ratings indicate the thermal limits for continuous acceleration and sustained operation. The drive uses an ICB1 inverter control board to coordinate current loops and protective trips.

The housing spans 100 mm in width, projects 325 mm in depth, and rises 380 mm high, so it occupies a narrow vertical slot next to other axis drives while leaving airflow channels clear. Its narrow footprint also helps keep adjacent modules close together while preserving front access inside the cabinet. With a mass of 7.8 kg, the unit can be handled without lifting equipment, yet the chassis still provides enough thermal mass to stabilize heat sink temperature during heavy cycles. The first-generation design also offers front-access terminals and standardized bus connectors, which help simplify cabinet integration in retrofit applications.