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Details on STEP, DIR, ENABLE signals, opto-isolation, and buffering for LPT port connection.
Describes optoisolated inputs for limit switches via an extension board and associated LEDs.
Explains control of high current relays K1 and K2 for additional machine devices via LPT port.
The PLC330 is a versatile multichannel stepper motor driver designed for controlling up to four machine axes via an LPT-port. This driver is a microstepping device, offering enhanced precision and smooth operation for various applications. It incorporates several protective features and supports a range of functionalities, making it suitable for both hobbyist and professional CNC setups.
The core function of the PLC330 is to translate control signals from an LPT-port into precise movements for up to four stepper motors. It supports standard STEP/DIR/ENABLE signals, making it compatible with popular CNC programs like Mach and TurboCNC. Each of the four stepper motor drivers is identical and capable of microstep division (1:2, 1:8, 1:16), which significantly improves positioning accuracy and reduces motor resonance at lower speeds. The device also features automatic current reduction in stepper motor coils during standstill (AUTO-SLEEP mode), which minimizes acoustic noise and conserves energy.
Beyond motor control, the PLC330 integrates several auxiliary control capabilities. It includes an inbuilt regulated timer for controlling a coolant pump, which can be activated based on a logic '1' signal from the LPT-port. The switching frequency and duration of the coolant pump relay operation are adjustable. Additionally, the driver features a PWM converter that translates a PWM signal from the controlling program into a voltage output (0-9.5V), enabling the control of a frequency converter for spindle rotation. This converter is optoisolated and draws its power from the frequency converter itself.
For machine safety and automation, the PLC330 provides five optoisolated inputs for connecting external sensors, such as limit switches or an E-STOP button. These inputs are managed through an additional extension board, ensuring electrical isolation from the main control circuitry. The driver also supports the control of two high-current relays (7A/220V), which can be used to switch additional machine equipment like a spindle, coolant pump, or electric fan.
The PLC330 is designed for ease of integration and use within a CNC system. It utilizes a single supply voltage for all its internal circuitry and incorporates a soft-starter system for smooth power-up. The control signals from the LPT-port are galvanically isolated and buffered, protecting the PC's LPT-port from potential electrical interference. Convenient dismountable clip connectors are provided for connecting stepper motors, the power source, and relay loads, simplifying wiring and maintenance.
The driver offers discrete current adjustment for each stepper motor coil, allowing users to fine-tune the operating current to match the specific requirements of their motors. This adjustment should be performed when the driver's power supply is off. The fixed PWM frequency of 20 kHz for current control ensures stable and efficient motor operation.
For optimal performance, it is recommended to use the driver with Purelogic R&D stepper motors (PL42/PL57 series), although it can work with other bipolar and unipolar stepper motors (4, 6, or 8 outputs). The step division mode (microstep) can be selected for each channel independently, with 1:8 or 1:16 microstepping generally recommended for the smoothest rotation and minimal low-frequency vibrations.
The PLC330 incorporates several protection functions to ensure reliable and safe operation. These include:
The module's design with dismountable clip connectors facilitates easy replacement or troubleshooting of components. The instruction manual provides guidance on common problems and their solutions, such as issues with LED indicators (HL3, HL4) signaling coil circuit protection activation or exceeding voltage power protection.
Regular maintenance primarily involves ensuring correct connections and settings. Users are advised to turn off the power device before making any connections or changing driver operation modes. It is also crucial to observe the polarity of the power supply and control signals. The length of stepper motor wires should not exceed 10 meters to prevent work failures, and it is recommended to interlace stepper motor wires per phase and enclose them in screened metal sheathes, which should be grounded.
The device is designed for operation within a specified temperature range and has a robust build. The warranty period is 12 months, provided operational conditions and scheduled maintenance are strictly followed. The manufacturer emphasizes that the product's component parts and configuration may be changed without notice due to continuous technical improvement, and users are encouraged to download the latest versions of the instruction manual from the manufacturer's website.
General| Current Limit | Adjustable |
|---|---|
| Acceleration/Deceleration | Adjustable |
| Output Current | 30A |
| Protection Features | Overcurrent, Overvoltage, Overtemperature |
| Storage Temperature | -20°C to +60°C |
