Megmeet L6 Series - User Manual

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Overview

Function Description
Important Technical Specifications
Usage Features
Maintenance Features

The L6 Series Controller, manufactured by Shenzhen Megmeet Drive Technology Co., Ltd., is a low-voltage DC input, high-current output AC motor controller designed for a variety of electric vehicles. It is powered by a battery system and is suitable for applications such as electric forklifts, battery touring buses, golf carts, lawn mowers, cleaning cars, AGV cars, and various small passenger cars.

Function Description

The L6 series controller provides comprehensive control and protection features for electric vehicle motors. Its core function is to manage the operation of AC motors, enabling precise speed and position control. The controller implements an optimized PID control algorithm and utilizes electric differential speed control, which eliminates the need for a front axle and differential, offering greater control flexibility.

Key functions include:

Motor Control: Closed-loop vector, IF mode, and VF mode control for AC motors, with a maximum output frequency of 300Hz.
Communication: High-speed CAN communication (CANopen) for stable and timely monitoring of the controller's working status. It also supports RS485 communication for external card charging terminals.
Protection: Extensive protection mechanisms are built-in, including over-voltage, over-current, over-temperature, power-on open circuit, tire angle sensor fault, accelerator pedal fault, overload, contactor suction/open fault, long charging time protection, charging failure, current detection abnormal protection, KSI startup abnormal protection, and encoder fault. Battery electrode reverse connection protection and output drive short circuit protection are also included.
Monitoring and Diagnostics: The controller can be connected to a host computer for real-time monitoring of vehicle running status, IO port status, and parameter management (upload/download). It also features a handheld controller for programmable control and debugging.
Advanced Features: Supports functions like turning, speed limiting, and braking recovery based on steering wheel angle and vehicle speed. It can also implement ESP electronic body stabilization. The online programming capability ensures product upgradeability.

Important Technical Specifications

The L6 series controllers come in various models, each with specific voltage and current ratings, as detailed in the product series table.

General Specifications:

Input Voltage: Low voltage DC, powered by a battery system (e.g., 12V, 24V, 36V, 48V, 80V, 96V, 144V, 300V, 320V, 500V).
Operating Voltage Range: Varies by model (e.g., 20V-28V for 24VDC, 33V-60V for 48VDC, 450V-600V for 500VDC).
Power Supply Starting Voltage: Varies by model (e.g., 18V for 24VDC, 28.8V for 48VDC, 100V for 144VDC).
Output Current: Ranges from 90A to 650A (1-hour rating), with higher peak currents for shorter durations (e.g., 200A to 600A for 30s rating).
PWM Frequency: 16kHz.
Logic Input Current: <10mA.
Radiator Insulation Strength: 500Vac.
Protection Degree (IP Rating): IP65 or IP67, depending on the model.
Cooling Method: Natural cooling (vehicle large heat sink) for most models; forced air cooling or water cooling for higher power models.
Ambient Temperature: -30°C to +50°C (derated when used in ambient temperatures of 40°C-50°C).
Storage Temperature: -40°C to +70°C.
Humidity: 5%~95%RH, non-condensing.
Vibration: Less than 9.8m/s² (1g).
Altitude: Used at places lower than 1000m (derated 1% for every 100m increase above 1000m).
Pressure: 70~106kPa.

Specific Model Examples:

L632-4845: 48VDC, 450A, IP65, Natural cooling.
L640-4D30: 320VDC, 260A (30s), IP67, Water cooling.
L650-5D90: 500VDC, 450A (30s), IP67, Water cooling.

Usage Features

The L6 series controller is designed for ease of use and adaptability in various electric vehicle applications.

Flexible Control: The electric differential speed control enhances maneuverability and simplifies mechanical design.
Upgradeable Firmware: Online programming allows for future updates and customization, ensuring the product remains current with evolving requirements.
Reduced Wear and Tear: Accurate speed and position closed-loop control minimize tire wear, extending equipment service life.
Intelligent Development: The controller supports advanced automation and intelligence, making it suitable for high-power AGV systems, automatic forklift control, and other unmanned vehicle applications.
Customization: The product is autonomously designed, allowing for customization to meet specific customer needs and highlight unique product features.
Cost-Effectiveness: Compared to foreign products, the L6 series offers higher cost performance, with an overall cost comparable to counterbalance forklifts but with enhanced flexibility.

Maintenance Features

The manual emphasizes several aspects related to maintenance and troubleshooting to ensure the longevity and optimal performance of the L6 series controller.

Unpacking Inspection: Users are advised to check for damage signs and verify that the nameplate's rated value matches the order requirements upon unpacking.
Safety Precautions: Strict safety guidelines are provided for installation, wiring, and operation to prevent injury and equipment damage. These include ensuring power disconnection before wiring, proper grounding, and avoiding operation with wet hands.
Installation Requirements: The controller should be fixed on a clean, flat metal plate with thermal silica for good heat dissipation. The installation location should have good ventilation, be clean, and protected from direct sunlight, corrosive gases, and explosive environments.
Wiring Guidelines: Wiring between the motor, battery, and controller should be as short and parallel as possible. Small current cables should be kept away from large current cables and crossed orthogonally. CAN communication buses should use twisted pair with shielding.
Diagnostic Tools: A powerful PC inspection system and a handheld controller are available for monitoring vehicle conditions and debugging. The handheld controller allows for initial debugging of machine parameters and setting various control parameters.
Fault Detection: The manual includes detailed tables for LED indicator display modes, alarm codes, and fault codes, along with possible causes and solutions. This facilitates quick identification and resolution of operational issues.
Motor Matching and Speed Setting: Detailed steps are provided for motor matching and speed setting, including parameter adjustments for different motor types and vehicle configurations.
Measurement and Recording: Procedures for measuring vehicle current under full load or no load climbing are outlined, emphasizing multiple tests and averaging data for accuracy.
Warranty and Service: Shenzhen Megmeet Drive Technology Co., Ltd. provides an 18-month warranty (not exceeding 24 months from manufacture date) and offers repair or replacement for abnormalities due to manufacturing or design defects. Paid repair services are available for products outside the warranty period or damaged due to misuse.