Common fault and troubleshooting of straight cutting machine
|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
|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
|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
|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
|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
|Power supply is too small |
and the current
of power supply cannot
| 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.
|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
|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
|Fuse of control power is burn. (on the bottom of control box. 1A)|
|Silk-feeding motor |
|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
|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.