Knowledge
Common fault and troubleshooting of straight cutting machine
| Phenomenon | Troubleshooting |
| No speed display | Fault of 5V power plate (replace) |
| Big trolley moves but no transversal movement or transversal moves but big trolley does not move | Fault of relay (replace) limit fault |
| No action for both big or small trolleys | Exciting adjustment power plate is broken (check fuse) replace |
| no pressure for cutting oxygen in cutting torch | Block of back fire arrester (replace) broken electro-magnetic valve (replace) |
Common fault and troubleshooting of assembling machine
| Phenomenon | Troubleshooting |
| Spot welding cannot stop | Broken time relay (replace) fault of contactor (replace) Welding device should be on no-arc position (adjust switch) |
| Motor fails to operate. | fault of motor (replace) inverter alarms (adjust according to alarm No. on manual) Danfoss, Emerson and Taian inverter |
| Not in the center | Adjust eccentric rate of flange plate supporting wheels and web plate supporting wheels then lock the locking screw. |
| no action when the welding torch in the working position | Check stuck pipe of mechanical part. (adjust) Check the pressure of gas supply. (adjust) Check the electromagnetic valve. (replace) |
| Fault of hydraulic station | (see common fault and troubleshooting of hydraulic transmission system) |
Common fault and troubleshooting of gantry welding machine
| Phenomenon | Troubleshooting |
| Column goes only up not down | limit fault (replace) contactor fault (replace) |
| Welding flux cannot be recycled. | Check the leakage of recycling system. Adjust and improve. Vacuum valve of recycling machine (replace) |
| Gantry cannot move. | Broken synchronous belt (replace) damaged motor (replace) Inverter alarms (Adjust according to alarm No. in manual.) |
| Wire feeding belt usually be burn. | It is not insulated between frame and welding flux. Check and adjust. |
Common fault and troubleshooting of straightening machine
| Phenomenon | Troubleshooting |
| Bearing in guiding wheel is easy to broken. | Certain distance should be kept to web plate during operation. (adjust) The side work piece distorted a lot. (adjust flame) |
| No action of elevation | Broken motor (replace) fracture of elevating nut (replace) Elevating silk pole and nut do not moves. (replace) |
| Elevating nut is easy to be broken. | over-load operation (improve operation) |
| SN522 bearing seat is easy to be broken. | over-load operation (improve operation) |
Common fault and troubleshooting of Hualian welding device
| Phenomenon | Troubleshooting |
| Power supply is too small and the current of power supply cannot be adjusted.（200A） | A. Lack phase (-380V output lacks phase.) Check incoming line of main circuit. |
| B. One-time voltage is too low (less than 340V). Check the voltage of incoming line of main power supply. | |
| C. Loose plug-in. Check plug on main board (plug-in A1-A6) | |
| D. Damage of main board. (Replace main board.) | |
| E. Controllable silicon is damaged. (Replace controllable silicon with the same modal.) | |
| It stops welding after welding for a period. This repeats. | A. No feedback. Check whether 14-core (No. 4.10.11 line) fractures. |
| B. No feedback. Check plug-in A1, A2 and A11 of control line board. | |
| Current and voltage is out of control. | A. Wrong settlement of control switch of main body. Choose remote control. |
| B. Wrong settlement of character switch of main body. Choose character of falling. | |
| C. Wrong settlement of switch of control box. During welding, it should be settled on “Welding”. | |
| The silk cannot be feed in or out when debugging (manual). | A. Wrong settlement of switch of control box. For welding wire, “Forward or“Back” should be chosen. |
| B. No “silk feeding in or out” signal. Adjust “Welding voltage” button slowly until it feeds silk. | |
| C. Fuse. Check the connection of fuse pipe to motor and motor armature. | |
| Unsteady arc voltage leads to low current. | A. Fracture of 14-core (It seems fracture but indeed not.). Check 14-core with multi-meter one to one. Meanwhile, shake 14-core control cable and check whether the pointer on Ω span of multi-meter swings. |
| B. Bad contact. Check whether plug on the control side of main pole is loose. | |
| C. Bad contact. Check whether the contact between grounding line (negative pole of welding device) and base metal is reliable. | |
| There is no open-circuit voltage after pressing Start button. | A. Fracture of line inside 14-core. Check 14-core. |
| B. Fault of main contactor of power supply. Check the main contactor and replace. | |
| C. Fault inside control box. Check whether plug-in inside control box is loose. | |
| D. Fault of control circuit board. Check group key IC2A. Replace. | |
| E. Fault of contactor. Check the JQX-14F inside control box. Replace. | |
| When welding, arc voltage cannot be adjusted. | A. No feedback. Check whether No. 4 line inside 14 core is open circuit. Start backup No. 14 line. |
| B. No feedback. Check whether the A11 plug on control circuit board is loose. | |
| C. Fault of potentiometer. Check potentiometer of welding voltage. Replace. | |
| D. Check whether fuse of control power supply is burnt. Replace (1A) | |
| no indication of control power, no action of control system | Fuse of control power is burn. (on the bottom of control box. 1A) |
| Silk-feeding motor cannot rotate. | A. Fuse. Check the fuse of silk-feeding machine. |
| B. Lining. Check the lining of silk-feeding machine. | |
| C. Motor. Check whether the motor is fine. | |
| D. Check voltage of excitation and armature. | |
| Silk-feeding wheels work but welding flux does not move. | A. Damage of silk-feeding wheels. Replace. |
| B. Wire blocks. Welding wire blocks on plate. Replace welding wire. | |
| C. Bad welding wire. Check welding wire and replace. | |
| unstable arc voltage, bad formation of welding seam | A. Conductive nozzle. Conductive nozzle is seriously damaged. Replace. |
| B. Bond trap. Check the contact situation of positive pole of welding device. | |
| C. Bad contact between work piece and material frame. Check whether there is paint or other insulator on material frame. Grind it. | |
| D. Check whether welding specification is correct. (Check current, voltage, speed. Remove dust, oil and do drying treatment. ) | |
| The arc does not start. | Broken insulation. Check insulation between silk-feeding organ and frame. Replace insulating gasket. |