How to troubleshoot a LOTOS Welding System torch that does not work?
If the LOTOS Welding System torch isn't working, first, ensure the power switch is turned 'ON'. Then, check the air supply to make sure it is not compromised. Finally, verify that the ground clamp and cable are securely attached to the workpiece or steel table.
Why do consumables wear out quickly on my LOTOS LT3500?
If consumables are wearing out quickly on your LOTOS Welding System, consider the following: First, ensure you are not exceeding the unit's capability by using material that is too thick; increase the cutting angle to prevent blowback into the torch tip. Second, check that the torch is assembled correctly. Third, make sure the air supply is adequate by checking the air filter and increasing air pressure if it's too low. Lastly, verify that the air compressor is working correctly.
How to fix insufficient penetration with LOTOS Welding System?
If you're experiencing insufficient penetration with your LOTOS Welding System, first check if the torch is tilted too much and make tilt adjustments. If the metal is too thick, several passes may be necessary. Also, inspect the torch parts for wear and repair or replace worn parts.
What to do if there is dross build-up on cuts with my LOTOS LT3500?
If dross is building up on parts of your cuts with the LOTOS Welding System, it could be due to a few reasons. One reason is that the tool and material are building up heat; allow the material to cool down before continuing to cut. Another cause could be that the cutting speed is too slow or the current is too high; increase the speed or reduce the current until dross is minimized. Lastly, inspect the torch parts for wear and repair or replace them as needed.
Why are sparks shooting upwards when using my LOTOS LT3500 Welding System?
If sparks are shooting upward instead of downward through the material when using the LOTOS Welding System, it may be because the plasma cutting torch isn't piercing the material; try increasing the current. It could also be that the torch is too far away from the stock; decrease the distance. Make sure the material is properly grounded by checking connections. Also, the travel speed might be too fast; reduce the speed.
Instructions on how to keep the manual for future reference and what information to record.
Emphasizes reading the manual before use for safety and proper operation.
Warning about electrical hazards associated with electrode and work circuits being live.
Information on hazards from plasma cutting fumes and gases and necessary precautions.
Discusses potential interference of EMF fields with electronic devices like pacemakers.
Overview of the LOTOS LT3500 Plasma Cutter's design and capabilities.
Lists the components and accessories that come with the plasma cutter.
Detailed technical specifications regarding input voltage, current, and output ratings.
Identifies and explains the controls and settings on the front of the unit.
Details the components and connections located on the rear of the machine.
Crucial pre-installation safety checks and requirements.
Guidelines for choosing an appropriate and safe operating environment for the machine.
Procedures for proper grounding to prevent interference and ensure safety.
Instructions and precautions for connecting the power supply to the machine.
Instructions for setting up the machine, including air/gas and consumables.
Guide for connecting the plasma cutting torch and ground cable to the unit.
Information on internal capacitors and safe waiting periods before servicing.
Procedures for preventing metal powder accumulation and checking components.
Explanation of the three-step process for diagnosing and resolving machine malfunctions.
A guide listing common plasma cutting problems, their causes, and recommended solutions.
The LOTOS LT3500 Plasma Cutter is a compact and powerful digital inverter plasma cutter designed for light cutting projects, making it an ideal choice for cost-conscious DIY hobbyists. It weighs only 8kg (17.6lbs), making it highly portable. This unit is capable of cutting 10mm (2/5inch) metal with a severance thickness of 15mm (3/5inch). It operates on a 110V automatic dual frequency (50/60Hz) power supply and features an efficient cooling fan system. The LT3500 is suitable for cutting various materials including Stainless Steel, Alloy Steel, Mild Steel, Copper, and Aluminum.
The LT3500 features a front control panel with a digital display, a current adjust knob, a temperature warning light (indicating over-current or over-heating), and a power indicator light. Connections for the torch power (electrode negative), ground cable & clamp (electrode), and torch trigger control are also located on the front. The rear panel includes the unit power switch, power cord, air filter regulator, cooling fan, and an air inlet/air hose connection (US Industry 1/4" NPT Male Coupler Quick Connector).
Before operation, it is crucial to ensure proper installation and safety precautions. The machine must be located in an area with open space for unrestricted air circulation and kept dry, away from dirt and dust. Stacking the LT3500 is not allowed, and it should be placed on a secure, level surface to prevent toppling.
For electrical connection, the LT3500 requires a 110V±10%, 120V±10%, 50/60Hz single-phase supply and can be easily connected to an existing 110/120V wall outlet with a circuit breaker requirement of >=30AMP. A 20amps minimum, 12 AWG extension cord up to 30 feet is recommended if needed. Longer cords require larger wire sizes.
The plasma cutting torch and ground cable are connected to the front panel terminals. The major power connector from the torch cable plugs into the "Cutting Torch" output terminal (5) and is tightened clockwise. The 2-prong connector from the torch cable plugs into the "Switch" 2-pin socket (7) and is tightened clockwise. The ground cable & clamp connect to the "Earth Clamp" output terminal (6) and are tightened clockwise.
For air/gas connection, an air compressor with a pressure regulator and flow gauge is needed. The quick connector on the machine's rear allows for easy connection to the air compressor. The recommended air pressure is 0.6~0.75Mpa, with a gas flow of 3.0scfm @70psi.
To operate, connect the air compressor, install the torch and ground cable, and turn the power ON. Adjust the air pressure to the recommended level. The output current can be adjusted from 12A to 35A using the "Current Adjust Knob." To make a cut, position the torch tip slightly above the work-piece, press the torch switch, and lower the tip until contact is made and the cutting arc is established. Move the torch in the desired direction, keeping the tip slightly angled and maintaining contact with the work-piece. Adjust the drag speed to ensure complete material cut-through, avoiding moving too fast (indicated by sparks radiating from the topside of the work-piece).
Routine maintenance is essential for the longevity and reliable operation of the LT3500. This includes preventing metal powder accumulation near aeration fins.
The machine has internal capacitors that charge to a high voltage during power-on. These discharge automatically when the power is switched off, but users must allow at least 5 minutes for the discharge process to complete before servicing the machine.
The manual emphasizes several critical safety warnings:
California Proposition 65 Warnings are also included, stating that welding/cutting equipment produces chemicals known to cause cancer and birth defects. Battery posts and related accessories contain lead, also known to cause cancer and birth defects. Engine exhaust (for gasoline and diesel engines) contains similar chemicals. Users are advised to wash hands after handling.
General| Brand | LOTOS |
|---|---|
| Model | LT3500 |
| Category | Welding System |
| Language | English |
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