VACIII D11 Okuma 11 Kilowatt 200 Volt AC Spindle Drive
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The Okuma VACIII D11 is an AC spindle drive from the VAC Spindle Drives series and features a rated capacity of 11 kW. It operates with a 3-phase input voltage range of 180 to 220 V AC and can handle input frequencies between 49 and 62 Hz. The drive has a maximum vibration tolerance of 0.5G and supports ambient temperatures up to 45°C during operation.
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Product Description:
The VACIII D11 spindle drive is produced by Okuma for the VAC Spindle Drives series. Designed as an AC spindle drive, it modulates three-phase power to control high-speed tool spindles on lathes, machining centers, and grinders. Within such equipment, the unit supplies regulated voltage and frequency, allowing the CNC to maintain commanded surface speeds during heavy cuts while reacting quickly to deceleration commands. Integrated monitoring circuits protect downstream motors and coordinate alarms with the machine controller.
The drive provides a continuous output of 11 kW, making it suitable for medium-power machining centers. The power stage requires a 200 V AC three-phase supply, and its input section tolerates line variations from 180 V AC to 220 V AC without derating. The accepted frequency range extends from 49 Hz to 62 Hz, allowing the drive to operate on either 50 Hz or 60 Hz power grids. A gate circuit protected by a 0.3 A fuse isolates the switching devices. A separate 5 A alarm fuse disconnects the control electronics during overcurrent faults. These input and protection characteristics support stable operation when the drive is connected to an appropriate industrial power source.
The control rack temperature should not exceed 45 °C, although the drive can withstand internal device temperatures up to 55 °C. During storage, components remain stable at temperatures as low as -20 °C and as high as 60 °C, permitting storage under common warehouse conditions. Relative humidity is acceptable up to 75% RH during normal service, with short peaks up to 95% RH when condensation is prevented. The assembly withstands vibration levels up to 0.5 G, allowing it to be mounted on machine frames without additional damping hardware. Proper cabinet ventilation helps keep the power semiconductors within their permitted junction temperatures, while moisture control protects insulation and electrical connections from deterioration.
