Technical Overview: Weihong PCIMC-3D CNC Motion Control System

The Weihong PCIMC-3D series represents a foundational hardware-software integration designed for precision motion control in 3-axis and 4-axis CNC environments.

This paper examines the technical architecture, installation protocols, and functional advantages of the Weihong CNC Adaptor PCIMC-3D 67

, a PCI-bus motion control card utilized extensively in engraving, milling, and cutting applications 1. Introduction

Modern CNC machining requires high-speed data transmission and reliable synchronization between software instructions and mechanical execution. Weihong Electronic Technology’s PCIMC-3D system addresses these needs by pairing a dedicated PCI adaptor card with the

motion control software. The "67" designation typically refers to specific hardware revisions or interface board pairings within the 3D control ecosystem. 2. Technical Specifications PCIMC-3D 67

is engineered to facilitate complex 3D operations with high precision: Axis Control

: Supports up to four axes of linear interpolation and two axes of arc interpolation. Communication Speed

: Features a high-speed interface capable of data transfer rates up to I/O Capabilities

: Includes eight digital input/output channels and two analog input/output channels for peripheral control (e.g., cooling, lubrication). Processing Power

: Equipped with a built-in DSP (Digital Signal Processor) to manage logic operations and real-time motion algorithms independently of the host PC's CPU. 3. Installation and Configuration Deployment of the PCIMC-3D 67 requires a multi-step hardware and software handshake Weihong Cnc Adaptor Pcimc 3d 67 - Facebook

Weihong PCIMC-3D is a hardware motion control card used with the

software (typically versions 5.4.49, 5.5.55, or 5.5.60) to manage 3-axis CNC milling and engraving machines. Key Components The system typically consists of: PCI Control Card

: The main interface card that installs into a computer's PCI slot. Interface/Breakout Board

: A terminal board (often referred to as an "adaptor" or "terminal board") that resides in the CNC control box to connect motor drivers and sensors. DB15 Cable

: A standard 15-pin connecting cable between the PC card and the terminal board. Specifications & Features

1. Card Overview – PCI-MC-3D-67

• Type: PCI slot motion controller for Weihong CNC systems (e.g., NK300, LFS, or older NCStudio).
• Axis: 3-axis standard (X, Y, Z) with optional 4th rotary.
• I/O:
  • 16 inputs (limits, home, probe, emergency stop, etc.)
  • 8 outputs (spindle, coolant, vacuum, relay control)
  • 2 analog outputs (0–10V for spindle speed)
• Connection: 68-pin SCSI or 50-pin IDC (depends on version – 67 top often uses 68‑pin).

Installation Guide: Step-by-Step

Incorrect installation is the #1 cause of "Adaptor not found" errors. Follow this guide carefully.

2. Key Technical Features

A. Motion Control Capabilities

• Axis Support: It typically supports up to 6 axes (4 axes of interpolation + 2 auxiliary axes, depending on the specific firmware version). It is most commonly used for standard 3-axis (X, Y, Z) configurations.
• Interpolation: Supports linear interpolation (up to 4 axes) and circular interpolation (helical interpolation). This ensures smooth curves and precise cornering.
• Pulse Output: Uses high-frequency pulse output (Pulse/Direction or CW/CCW) to control stepper or servo drivers.
• S-Curve Acceleration/Deceleration: Features flexible S-curve velocity profiles to ensure smooth machine motion, reduce mechanical vibration, and extend the lifespan of the machine tool.

B. I/O (Input/Output) Capabilities

• General I/O: The card is equipped with substantial I/O points to control machine accessories like coolant pumps, lubrication systems, and lights.
  • Inputs (DI): Usually supports 32 to 48 input points. These are used for limit switches, home switches, emergency stop signals, and operator panel buttons.
  • Outputs (DO): Usually supports 16 to 32 output points. These control relays for spindle activation, coolant, tool changers, etc.
• Isolation: The I/O interface often features optical isolation to protect the PC and the control card from electrical noise and voltage spikes generated by the machine's heavy-duty electrical components.

C. Spindle Control

• Analog Output: Equipped with a 0-10V analog voltage output interface. This allows the card to control the speed of a Variable Frequency Drive (VFD) or inverter, enabling programmable spindle speed control (S-codes).
• Gear Shift Support: Supports automatic gear shifting logic if the machine has a multi-gear spindle.

D. Encoder Feedback

• The card usually includes an encoder feedback interface. This allows it to receive feedback signals from the servo motor encoders or a separate spindle encoder. This is essential for:
  • Rigid Tapping (Synchronous tapping).
  • Thread cutting.
  • Closed-loop position monitoring.

E. Safety and Reliability

• Hardware Watchdog: Integrates a hardware watchdog timer. If the PC freezes or the software hangs, the card will automatically cut off output signals to prevent the machine from running uncontrolled.
• Handwheel Support: Includes a dedicated interface for an MPG (Manual Pulse Generator) handwheel, allowing the operator to manually jog the axes precisely.

3. Driver Communication Errors (ALM 017)

Weihong software frequently throws "Driver Alarm" errors even when the servo drives are fine. This usually means the Adaptor is not correctly translating the enable signals.