VACA D8-A
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The Okuma VACA D8-A is part of the VAC Spindle Drives series and features a VAC II drive unit type paired with a D8A power supply unit. It includes six transistor modules, each rated for 150 Amps, with a voltage rating of 600V or 450V depending on the module type. The drive uses PT768 diode modules.
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Product Description:
The VACA D8-A Drive offers 8kW spindle drive capacity and it includes both control PCB and power supply modules. This Okuma manufactured module connects via terminal blocks labeled E‑U‑V‑W‑N1‑P1 for motor power and terminals for encoder feedback and it follows the VAC‑II series layout.
This VACA D8-A Spindle Drive supports both analog and optical interfaces, selectable via internal switches that configure capacity and interface type and its control section hosts multiple status LEDs for charge, power on as well as for detecting error. It features connectors for pulse generator feedback, motor brake signals and monitoring of speed and torque and it includes SCR output stages with protective detection for overcurrent and ground faults and a control fuse of 3.2 amperes. This module's DIP switches allow resetting of servo axes and it supports output of single axis as well as double axis when fitted with extra control boards. It is often employed in CNC spindle control for industrial automation systems as it delivers precise speed and torque control with a built in feature of monitoring. It comes with a terminal base that supports M4 screw termination and its feedback channels include analog 0 to 10 volts torque and speed outputs.
The VACA D8-A Spindle Drive drive protective circuits cover DC voltage abnormalities and regeneration discharge and it also includes hard wired motor thermal brake control. This spindle drive module firmware is stored on the control floppy ROM and it matches drive units such as D‑11A and D‑22A in modular VAC‑II / VAC‑III series and it fully maintains compatibility with Okuma spindle motors and VAC system architecture.
Frequently Asked Questions about VACA D8-A:
Q: How does the analog interface enhance the VACA D8-A Drive’s performance?
A: The analog interface enables direct voltage control for torque and speed. It improves drive responsiveness during variable load operations.
Q: Why are DIP switches used in the VACA D8-A Drive?
A: DIP switches allow easy configuration of servo reset functions. They simplify control setup without requiring external programming.
Q: How does the 3.2A control fuse protect the VACA D8-A Drive?
A: The fuse prevents circuit damage by disconnecting during overcurrent. It safeguards internal control electronics from overloads.
Q: What is the advantage of having both single and dual-axis outputs?
A: Dual-axis output reduces the need for multiple drives. It enhances flexibility in complex CNC setups.
Q: Why does the VACA D8-A Drive support optical feedback along with analog?
A: Optical feedback improves signal integrity over long cable distances. It minimizes noise in high-speed operations.
