Adjustable acceleration from 0.5 to 4 seconds to reduce mechanical stress. 2. Understanding the Wiring (The "Schematic" Alternative)
Power enters the board through the main AC terminals (typically labeled L and N).
Below is a of the typical reference schematic you would find in the JYMC‑220BI datasheet. All component values are the most common for the 5 V‑fixed version; the 12 V version swaps a few resistors and a larger output capacitor. jymc220bi schematic full
| Specification | Value | | :--- | :--- | | | 230 VAC, 50/60 Hz (single-phase) | | Output Voltage | 0-180 VDC | | Max. Current Rating | 12 ADC for the "B" model | | Motor Type | Permanent Magnet (PM) or Shunt Wound DC Motor |
: Wired parallel across the output terminals to capture inductive feedback voltage spikes from the motor when the machine is suddenly switched off. Full Wiring Interconnection Map Terminal ID Wire Destination AC - L Main Power Toggle Switch (Hot) 115V AC Phase Input AC - N Main Power Cable (Neutral) Neutral Return Path A+ / M+ DC Motor Armature positive terminal Positive Motor Power A- / M- DC Motor Armature negative terminal Negative Motor Return P1 Potentiometer Pin 1 Low reference Ground ( P2 Potentiometer Pin 2 (Center) Variable Wiper Input P3 Potentiometer Pin 3 High reference Voltage ( +Vpositive cap V Calibration Potentiometers (Trimpots) Adjustable acceleration from 0
If you are currently diagnosing a broken control board, let me know your lathe is showing (e.g., completely dead, blowing fuses, or running at full speed) or which components look physically damaged , and I can guide you through the exact multimeter tests to isolate the problem. Share public link
): A low-resistance, high-wattage shunt resistor is placed in series with the motor armature. This acts as a real-world torque feedback mechanism; when the cutting tool digs into metal and stalls the motor, the voltage drop across this resistor spikes, triggering an immediate internal current-limiting loop. Pinout Mapping & External Wiring Topography Below is a of the typical reference schematic
The board features several onboard micro-potentiometers used to fine-tune operations. These come calibrated from the factory, but swapping out a motor or control board requires minor recalibration:
Because the unit manipulates a DC motor, incoming AC must be systematically transformed.