Product Description:

The VAC3-D22 spindle drive unit is produced by Okuma as part of the VAC Spindle Drives series. It conditions incoming AC power and delivers variable-frequency output to a machining center’s spindle motor. By managing torque and speed in real time, the unit enables precise cutting operations and coordinated tool changes within automated production lines. Okuma classifies it as a spindle drive unit, indicating that it is intended for positioning and rotational control of the machine spindle rather than for axis feed duties. Its design integrates connectors for power, feedback, and optical communications so installation in an Okuma CNC cabinet remains straightforward.

The drive’s power stage is rated at 22 kW, allowing it to energize medium-size spindles used in milling or turning centers. Internal diagnostics reference a DC bus check threshold of 300 V DC, which indicates the capacitor charge level during service checks. The input section accepts three-phase mains from 170 V AC to 242 V AC, covering typical factory low-voltage networks. An optical backplane governs command and status exchange, and the interface type is identified simply as Optical. For high-speed data transfer between the CNC and the drive, Okuma provides a dedicated fiber port labeled XB-OPT(CNOFS), which mates with standard plastic optical fiber jumpers.

Frequency compatibility spans from 50 Hz utility grids to 60 Hz supplies, letting the same model operate in multiple regions without hardware changes. Motor power is routed through the changeover connector XB-CHG(CN1), while incremental position feedback arrives on the encoder connector XB-EPG(CN2). A resolver channel is also present on XB-RES(CN3) to support hybrid feedback arrangements. These dedicated connectors separate high-current, digital, and analog signals, which helps reduce electromagnetic interference inside the enclosure. The frequency range and organized connector layout support consistent integration in machine control cabinets.