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added RS485 communication with VFD

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cpu
2025-12-27 18:40:22 +01:00
parent ccb6470b67
commit 555f220e0e
5 changed files with 50 additions and 31 deletions
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Readme.md
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@@ -34,6 +34,8 @@
* **Limit Sensors:** 3x **LJ12A3-4-Z/BX** (Inductive NPN NO).
* *Note: The PiBot V4.7 features built-in 0-10V analog output and opto-isolated inputs, eliminating the need for separate converter modules and isolation boards.*
![PiBot FluidNC GRBL Laser CNC Controller V4.7B top](images/PiBot_Board_top.jpg)
![PiBot FluidNC GRBL Laser CNC Controller V4.7B bottom](images/PiBot_Board_bottom.png)
### Power System (Dual PSU)
* **Motion Power:** Mean Well **LRS-350-24** (24V, 350W) for Drivers.
* **Logic Power:** Mean Well **MDR-20-24** (24V, 20W DIN Rail) for PiBot Board & Sensors.
@@ -90,8 +92,8 @@ The PiBot V4.7 uses 5V logic shifting for axis signals. The following diagram il
### D. Spindle Control (0-10V Direct)
The PiBot V4.7 includes an integrated 0-10V circuit.
**Signal Connection:**
* Locate the **10V Spindle Interface** terminal on the PiBot.
**1. 0-10V Signal Connection**
Locate the **10V Spindle Interface** terminal on the PiBot.
| PiBot Output | VFD Terminal | Function |
| :--- | :--- | :--- |
@@ -101,6 +103,22 @@ The PiBot V4.7 includes an integrated 0-10V circuit.
| **out2/Rev** | **REV** | Reverse Signal |
| **out common** | **DCM** | Digital Common |
**2. RS485 Implementation Detail (4-Core Shielded)**
It allows for digital precision (no voltage drift), real-time RPM feedback, and the ability to monitor VFD temperature and current via the FluidNC Web UI.
To ensure zero-error communication at 24,000 RPM, the RS485 cable must be paired as follows:
1. **Signal Pair:** [RS+] and [RS-] must share a single twisted pair to maximize differential noise cancellation.
2. **Reference Pair:** Both wires of the remaining twisted pair are joined for [GND] to provide a stable common-mode reference between the PiBot and VFD logic.
3. **Shielding:** The drain wire/braid is connected to the VFD Earth terminal (PE) only. The PiBot side of the shield is left floating (cut and insulated) to prevent ground loops.
4. VFD Config (Huanyang):
Set PD001=2 and PD002=2 for RS485 control.
Set PD163=1, PD164=1, PD165=3 for 9600 baud communication.
5. Wiring:
PiBot [A] → VFD [RS+]
PiBot [B] → VFD [RS-]
PiBot [GND] → VFD [DCM] (If required)
Shield → VFD PE (Earth Ground screw)
### E. Probe (GX12)
* **Pin 1 (GND):** Alligator Clip.
* **Pin 2 (Signal):** Touch Plate (Connect to PiBot Probe Input).
@@ -162,6 +180,7 @@ For **1.5kW, 220V, 400Hz** spindle:
| **PD005** | Max Freq | **400.0** | |
| **PD004** | Base Freq | **400.0** | **CRITICAL:** Do not leave at 50/60. |
| **PD003** | Main Freq | **400.0** | |
| **PD011** | Min Freq | **100** | Lowest spped 6,000 RPM Safety Limit |
| **PD141** | Rated Voltage | **220** | |
| **PD142** | Rated Current | **5** | |
| **PD143** | Motor Poles | **2** | High-speed CNC spindles are 2-pole. |