JYMC-220B-II токарная панель управления ... - AliExpress
| Reference | Part | Value/Model | Quantity | |-----------|------|-------------|----------| | U1-U3 | Optocoupler | PC817C | 3 | | U4 | Buck converter | LM2596S-5.0 | 1 | | U5 | LDO | AMS1117-3.3 | 1 | | U6 | Stepper driver | TMC2209-LA | 1 | | D1, D2 | Schottky diode | SS34 | 2 | | R1-R3 | Resistor | 330Ω 0805 | 3 | | R4-R6 | Resistor | 10kΩ 0805 | 3 | | RSense | Current sense | 0.1Ω 2512 | 2 | | RV1 | Trimpot | 10kΩ 3296W | 1 | | C1, C6, C7 | Ceramic | 100nF 0805 | 3 | | C2, C3 | Electrolytic | 220µF/50V | 2 | | C4, C5 | Ceramic | 10µF/25V 1206 | 2 | | FB1 | Ferrite bead | 120Ω/100MHz | 1 |
If your mini lathe suddenly stops spinning, runs only at full speed, or repeatedly blows fuses, look closely at these common points of interest on the JYMC-220B-I:
(2-3 terminals). For connecting an external speed control knob Control Signal . Likely for external logic or safety signals Key Technical Specifications
If you are working through a specific repair on this speed controller, tell me: jymc220bi schematic 2021
: Test the speed pot resistance between its terminals (center to end) while rotating it. Check for 0Ω to maximum resistance (typically 5kΩ–10kΩ) smoothly. Test the LM324 output pins for proper waveform generation using an oscilloscope.
The brain of the board consists of a specialized pulse-firing IC or a discrete transistor array configured as a relaxation oscillator (using a UJT—Unijunction Transistor). This logic segment converts the variable resistance reading from the external speed control potentiometer into precisely timed gates pulses sent straight to the SCR trigger pins. 3. Onboard Potentiometer Matrix
An SCR-based speed controller utilizes a classic phase-angle trigger system. Instead of pulsing raw DC like a Pulse Width Modulation (PWM) controller, the JYMC-220B-I chops incoming AC sinewaves to control the average voltage sent to the motor brush terminal block. 1. Power Input and Rectification Stage
: Many users find it easier to replace the board entirely or swap common components like the potentiometer if speed control becomes erratic Likely for external logic or safety signals Key
To keep your lathe's control board running smoothly, ensure the electrical enclosure remains completely sealed against flying metal chips and coolant mist. Periodically blow out dust using clean compress air and visually inspect the electrolytic capacitors for any signs of swelling, bulging tops, or fluid leaks. If a board replacement is necessary, new drop-in units remain widely sourced via industrial parts distributors on platforms like eBay's Industrial Speed Controls and specialized hobby lathe suppliers.
The user interface connects via a multi-pin header leading to the lathe's control panel.
Check the potentiometer wiring (P1, P2, P3). If the pot is fine, the 555-timer IC or the optocoupler (often a PC817 ) on the board may have failed.
The (or JYMC-220D-I ) is a variable speed DC motor controller commonly used in hobbyist machinery like mini lathes (e.g., Sieg, Precision Matthews) and milling machines. Core Technical Specifications The brain of the board consists of a
: The "220B-I" designation typically signifies a 230V AC input rating with a current capacity often around 12A , though variants for 110V/120V systems (like the JYMC-220A) also exist. Protection Features :
The JYMC-220BI circuit operates as a (SCR). It utilizes a bridge rectifier to convert AC to pulsating DC, and a Silicon Controlled Rectifier (SCR) to modulate the average voltage reaching the motor. Core Components of the Schematic Bridge Rectifier (DB1): Converts incoming AC to DC.
Known for superior torque regulation and reliability.
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