The LGK-200/300/400MA is an air plasma cutting machine designed for various metal cutting applications. This manual provides comprehensive instructions for its safe operation, maintenance, and troubleshooting.
Function Description:
The LGK-200/300/400MA is an advanced plasma cutting machine that utilizes an air plasma arc to cut through different types of metal materials, including low carbon steel, alloy steel, and non-ferrous metals. It is designed for industrial use, offering efficient and precise cutting capabilities. The machine incorporates an advanced electronic power IGBT inverter switch component and a three-phase AC power converted to 20KHz high-frequency DC current, which is then inverted to AC high frequency current and subsequently rectified to DC current. This process ensures stable and high-quality cutting performance.
Key features include:
- Gas Pressure Sensor: Adopts a gas pressure sensor to ensure the cutting torch is properly protected when gas pressure is too low.
- Liquid Flow Sensor: Incorporates a liquid flow sensor to protect the cutting torch when liquid flow is too low, with the liquid flow displayed on the display meter.
- Gas Pre-flow and Post-flow Time: The gas pre-flow time, gas post-flow time, and current up-slope time can be separately set according to the torch cable length.
- Plasma Gas Pressure Display: The plasma gas pressure can be adjusted on the panel and displayed on the meter for user-friendly operation.
- Digital Communication Connector: Features a digital communication connector for integration with different automation equipment.
- Torch Monitoring Function: Equipped with a torch monitoring function to warn users to change consumables, extending torch working life.
- Intelligent Fan: An intelligent fan is used to reduce dust accumulation.
- Automatic Protection: Includes automatic protection for over-heating, lack-voltage, lack coolant flow, etc.
- Integrated Water Cooling System: Features an integrated water cooling system, especially for big power water cooling torch use.
- Mesh Material Cutting: Suitable for mesh material cutting.
Important Technical Specifications:
The LGK-200/300/400MA series comes in three models: LGK-200MA, LGK-300MA, and LGK-400MA, each with varying capacities.
General Specifications:
- Rated Input Voltage: 3~380/415V 50/60Hz
- Insulation Grade: F
- Protection Grade: IP21S
- Plasma Gas: Compressed air
- Torch Cooling Mode: Air cooling/water cooling
Model-Specific Specifications:
| Parameter |
LGK-200MA |
LGK-300MA |
LGK-400MA |
| Rated Input Power |
44.1 kVA |
56.6 kVA |
84.9 kVA |
| Rated Input Current |
67A |
86A |
129A |
| Rated Output Current |
200 A |
300A |
400 A |
| Rated Output Voltage |
160 V |
160 V |
170 V |
| Rated Duty Cycle |
60% |
60% |
60% |
| Open Circuit Voltage |
370 VDC |
370 VDC |
370 VDC |
| Current Adjust Range |
40~200 A |
60~300 A |
60~400 A |
| Quality Cutting Thickness (C.C.) (speed 200mm/min) |
50 mm |
60 mm |
70 mm |
| Max Cutting Thickness (C.C.) |
70 mm |
100 mm |
120 mm |
| Plasma Gas Pressure |
0.4~0.6 MPa |
0.4~0.6 MPa |
0.4~0.6 MPa |
| Dimension (L×W×H) |
1040×415×1010 mm |
1130×480×1050 mm |
1130×480×1050 mm |
| Weight |
115 kg |
150 kg |
150 kg |
Plasma Gas Condition:
- Gas pressure range: 0.5MPa~0.7MPa
- Gas supply pipe compression strength: ≥1MPa
- Gas supply pipe inner dimension: ≥Φ8
- Gas flow: ≥180L/min
- Filter the water in the gas, then feed into the plasma.
Usage Features:
The machine is designed for ease of use with a clear control panel and various adjustable settings.
- Power On Self Test: After powering on, the machine performs a self-test. The LED indicators will light up, then turn off, and the display will show the air pressure value. The memory status is recalled and displayed on the panel.
- Air Pressure Adjustment: The air pressure can be adjusted using the "GAS TEST" knob.
- Liquid Flow Display: The liquid flow can be displayed by pressing the "TORCH" key and switching to "WATER COOLING" status.
- Cutting Current Setting: The cutting current can be adjusted using the knob. In standby mode, the meter displays the pre-setting current. In cutting mode, it displays the actual cutting current.
- Secondary Menu: Access to a secondary menu allows for fine-tuning of various parameters, including gas pre-flow time, gas post-flow time, cutting time, piercing time, and monitoring warning functions.
- Torch Monitoring Function: The machine monitors the torch's working condition and displays warning codes for issues like excessive wear of the nozzle and electrode. Users can choose to stop working or display warning information.
- Cutting Material and Thickness: The selection of cutting parameters (current, gas flow, arc voltage) depends on the material type and thickness. The manual provides a cutting table for low carbon steel with different thicknesses and corresponding cutting speeds.
Maintenance Features:
Regular maintenance is crucial for the longevity and optimal performance of the LGK-200/300/400MA.
- Coolant System: The coolant box should be filled with 20L of coolant. The coolant liquid is irritating to skin and eyes, and should be handled with care. If contact occurs, wash immediately with clean water and seek medical help. Do not use anti-freezing solution as coolant. The working temperature of the coolant liquid is between -12°C~40°C. If the temperature is not within this range, self-control mixed coolant liquid should be used.
- Filter and Regulator: The pressure regulating filter should be checked periodically. If the water level reaches two-thirds of the filter glass, it must be drained. The gas supply valve should be closed during water draining.
- Grounding: Ensure proper grounding of the machine and the workpiece to prevent electric shock.
- Consumables: Regularly check and replace worn-out consumables (nozzle, electrode, swirl ring, shielding cap) to maintain cutting quality. The torch monitoring function helps in this regard.
- Cleaning: Keep the machine clean and free from dust and metal filings. Open and clear inside the machine with dry compressed air at least once a year.
- Cable Inspection: Check the insulation of all cables regularly and repair any damages.
- Filter Regularity: Discharge water and impurities in the filter regularly.
- Troubleshooting: The manual provides a detailed troubleshooting guide for common issues, including power supply problems, torch and wire damage, gas pressure issues, water cooling problems, and abnormal indicator lamps.
- Qualified Electrician: Only qualified electricians should maintain the machine, and the power should be cut off during maintenance.
Safety Precautions:
- Electric Shock: Always ensure proper grounding and wear protective gear. Do not touch live electrical parts.
- Fumes and Gases: Ensure adequate ventilation. Plasma cutting produces harmful fumes and gases.
- Fire and Explosion: Keep flammable materials away from the cutting area. Spatter can cause fire.
- Radiation: Wear protective shields to protect against ultraviolet radiation.
- Noise: Wear hearing protection as noise levels can exceed 80 dB.
- Lifting Equipment: Use appropriate lifting equipment when moving the machine.
By following these guidelines, users can ensure safe, efficient, and long-lasting operation of the LGK-200/300/400MA air plasma cutting machine.
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