VAC-D8 Okuma
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The Okuma VAC-D8 is part of the VAC Spindle Drives series and features a seven-segment LED alarm display and an analog interface. It uses fan cooling for both the heat sink and motor, and is constructed with a control PCB and power unit. The drive supports analog magnetic encoder type and uses ±12 V, +24 V control voltage rails along with 3.3 V/5 V logic supply rails.
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Product Description:
The VAC-D8 is a spindle drive control module produced by Okuma for the VAC Spindle Drives series. Intended for CNC machining centers, the unit connects the machine control to a dedicated spindle motor. It converts command references into regulated three-phase power while processing the feedback needed for spindle control. This arrangement allows spindle speed and orientation to follow programmed machining profiles during cutting, tool changes, and other coordinated machine movements.
A front-panel seven-segment LED displays alarm codes, allowing faults to be identified without external diagnostic equipment. A split supply provides ±12 V and +24 V control rails, separating the bias used for analog regulation from the power supplied to relay actuators. Spindle position feedback is accepted through an analog magnetic encoder channel, which receives continuous sine-cosine voltages for high-resolution interpolation. Motion commands enter through an analog reference interface, allowing the numerical control system to transmit spindle speed commands as a ±10 V signal. The module combines a control PCB and power unit in a stacked arrangement that separates high-frequency power switching from sensitive logic circuits. This separation helps prevent switching noise from interfering with command processing, position feedback, and alarm monitoring.
The low-power section operates from separate 3.3 V and 5 V logic rails, keeping digital timing circuits isolated from the higher-voltage analog and actuator supplies. A dedicated fan on the motor shroud provides airflow around the shaft temperature and load-sensing area. A separate blower directs air across the heat sink to control the operating temperature of the power devices during sustained spindle operation. Stored calibration parameters preserve the control values used by the module without requiring repeated manual adjustment during normal operation. The control PCB processes command and encoder signals, while the power unit supplies the regulated three-phase output required by the spindle motor.
