Summary of the top ten failures and solutions of CNC plasma cutting machine

CNC plasma cutting machine combined with easy-to-use CNC system, the use of high temperature in the nozzle jet out of the high-speed gas stream ionization, thus forming a conductive body. When the electric current passes through, the conductive body that is the formation of a high-temperature plasma arc, the heat of the arc so that the metal at the workpiece kerf localized melting (and evaporation), and with the high-speed plasma flow of power to exclude the molten metal in order to form the kerf of a processing method. The long, thin and stable plasma arc formed by the circular gas flow technology ensures that any electrically conductive metal can be cut smoothly and economically. But the plasma cutting machine in the work process, sometimes there are a variety of problems, this article UTECH on the daily production, CNC plasma cutter failure phenomenon, summed up the top ten failure causes and solutions.

1.After opening the "power switch" of the plasma cutting machine, the power indicator light is not on.

2.After the plasma cutting machine is connected to the input power, the plasma cutting machine fan does not turn, but the power indicator light is on.

3.After the plasma cutting machine is connected to the input power, the power indicator light is on and the fan is normal, but no airflow is emitted after the "test gas" switch is turned on.

4.open the plasma cutting machine host panel of the "test gas" switch, there is a gas flow out, press the torch switch, the machine does not have any response.

5.plasma cutting machine contact can be cut, but non-contact can not be cut, the test non-transfer arc no sparks out of the nozzle.

6.press the plasma cutting machine torch switch, the nozzle in the air flow, but the "high grade" and "low grade" can not cut.

7.plasma cutting machine high and low gear only a gear can work.

8.The plasma arc is not stable when the plasma cutter is working.

9.plasma cutting machine kerf is too wide, cutting quality is not good.

10.Plasma cutting machine with torch burned out.

Failure 1: Open the plasma cutting machine host "power switch", the power indicator does not light.

Cause analysis and solutions:

(1) "power indicator" bad: replace the indicator light

(2) 2A fuse is bad: replace the fuse

(3) no input three-phase 380V voltage: check whether the power supply problems

(4) input power supply phase: use a multimeter to check the three-phase power supply

(5) bad power switch: replace the switch can be

(6) control board or host bad: maintenance

Failure 2: After the plasma cutting machine is connected to the input power supply, the plasma cutting machine fan does not turn, but the power indicator light.

Cause analysis and solution:

(1) input three-phase power supply phase: use a multimeter to check the three-phase power supply

(2) the fan blade is stuck in foreign objects: foreign objects can be removed

(3) fan power plug is loose: re-inserted can be

(4) fan lead broken: maintenance

(5) fan damage: repair or replacement

Failure 3: plasma cutting machine connected to the input power supply, the power indicator light, the fan is normal, but open the "test gas" switch after no airflow out.

Cause analysis and solutions:

(1) no input compressed air: overhaul the air source and air supply pipeline

(2) air filtration pressure reducing valve failure, the pressure gauge indicator value is 0, "insufficient air pressure" indicator light: adjust the pressure reducing valve pressure or replace the pressure reducing valve

(3) "test air" switch is damaged: replace the switch

(4) bad solenoid valve in the host: overhaul or replacement

(5) air supply pipeline leakage or disconnection: maintenance

Failure 4: open the plasma cutting machine host panel "test gas" switch, there is a gas jet, press the torch switch, the machine does not have any response.

Cause analysis and solutions:

(1) The plasma torch switch is bad or the connecting wire is broken: overhaul or replacement.

(2) plasma cutter panel "cutting" switch is bad: overhaul or replacement

(3) bad cutting machine host control board: overhaul or replacement

(4) cutting machine is in a protective state due to temperature and other reasons: wait for the temperature is normal

(5) water circuit is not working properly, resulting in low water pressure protection: check the water circuit and water pressure valve

(6) host control variable or related lines, components are damaged: maintenance

Failure 5: plasma cutting machine contact can be cut, but non-contact can not be cut, test non-transfer arc no spark spray nozzle.

Cause analysis and solutions:

(1) 15A fuse core broken circuit: replacement can be

(2) pressure reducing valve on the air pressure is too high: adjust the pressure

(3) the torch in the parts damaged: check and replace

(4) torch moisture, compressed air in the water is too high: drying, add water filtration devices

(5) Arc lead wire breakage: replace it

(6) torch damage: replacement can be

Failure 6: Press the plasma cutting machine torch switch, the nozzle in the air flow, but the "high grade" and "low grade" can not cut.

Cause analysis and solutions:

(1) input power supply phase: overhaul

(2) air pressure is less than 0.45Mpa: adjust the pressure reducing valve pressure

(3) input air flow is too small: to ensure that 0.3m3 / min

(4) poor contact between cutting ground and workpiece: re-clamping or replacement

(5) Electrode nozzle or other parts in the torch are damaged: replace with new parts.

(6) Incorrect cutting method: put the nozzle and workpiece correctly.

(7) plasma cutting machine torch cable breakage: replacement or reconnect good

(8) host "spark discharger" distance is too large or short circuit: distance to ensure that about 0.5mm

(9) part of the host components are damaged, such as: pressure controllers, etc.: overhaul or replacement

(10) Damage to the control board in the main machine: overhaul or replacement.

(11) Damage to the plasma cutting torch: replace.

Failure 7: Only one of the high and low gears of the plasma cutting machine can work.

Cause analysis and solution:

(1) Cutting thickness selector switch is bad or the wire is broken: Replacement

(2) AC contactor has a damaged: check and replace

(3) the main rectifier is bad or the relevant wire broken: replacement or repair

Failure 8: The plasma arc is not stable when the plasma cutting machine is working.

Cause analysis and solutions:

(1) The air pressure is too low or too high: Adjustment

(2) torch in the electrode or nozzle burnt: replacement

(3) input AC voltage is too low: adjust the input voltage

(4) cutting ground wire and workpiece contact is poor: re-clamping or replacement

(5) Cutting speed is too slow: adjust the cutting speed

(6) spark discharger can not automatically break the arc: normal discharge 0.5s, maintenance

(7) the host of the relevant components are not working properly: maintenance

Failure 9: plasma cutting machine kerf is too wide, poor cutting quality.

Cause analysis and solutions:

(1) cutting speed is too slow: adjust the speed

(2) Electrode nozzle has been burned: Replacement

(3) cutting material and cutting thickness and selection switch gear does not match: select the correct gear

(4) Nozzle type is not correct: replace the correct type of nozzle

Failure 10: Plasma cutting machine with a torch burned out.

Cause analysis:

(1) metal pressure cap is not pressed

(2) torch conductive connections loose, water leakage

(3) poor insulation at the torch connector

(4) the torch on the ceramic protective sleeve has been damaged, but not replaced

(5) Excessive moisture in the compressed air

(6) Separate cutting machine parallel cutting torch wrong

(7) Electrode burned and not replaced in time

(8) Water-cooled torch work water circuit is not normal, interface leakage

Solution: Often on the plasma cutting machine torch part of the connecting parts of the inspection to ensure that the parts with good.

Shandong U-May CNC Technology Co., Ltd. is a high-tech company specializing in producing and manufacturing high-quality CNC plasma cutting machines. The company insists on continuous innovation and development, and strives to improve the quality and reliability of its products, providing customers with high-quality products, mature and reliable technology solutions and perfect technical services, providing systematic technical training and quality after-sales service.