I. Power Supply/Electrical Control System Failures
This is the most common type of failure, often related to power connection and environment:
1. The machine does not work at all after being plugged in: This could be due to abnormal operating voltage, a faulty leakage circuit breaker, a broken power cord, or a blown fuse.
2. The display screen does not show anything/has a distorted image/makes a buzzing sound after power is applied: This is generally due to moisture/impact aging of the display screen, loose wiring, or a faulty mainboard power supply module.
3. Frequent tripping of the leakage circuit breaker: This is usually due to the power cord of the heating plate, oil pump, or cutter coming into contact with the casing, or electrical components leaking current due to moisture.
4. Displaying overcurrent/overvoltage/welding abnormality: This could be due to an external power supply voltage mismatch, a short circuit in the internal heating element of the PE pipe, or a malfunction in the pipe itself.
II. Heating/Temperature Control System Failures
This directly affects welding quality and is a key area for troubleshooting:
1. The heating plate does not heat at all/heats up slowly: This could be due to a broken heating wire, a damaged temperature controller, insufficient power supply voltage, or loose wiring.
2. Abnormal Temperature Control Display (HH/Temperature Jump/Large Deviation):
HH Display: Temperature sensor (PT100 platinum resistance thermometer) is disconnected; sensor resistance deviation exceeds 10%.
"1" Display: Sensor short circuit.
Temperature Jump: Poor contact of the temperature control dial; requires resetting or replacement of the temperature controller.
Large Temperature Deviation: Adjustable potentiometer on the temperature control surface; excessive deviation indicates damage to the temperature controller or sensor.
3. Frequent Material Sticking to Heating Plate: Non-stick coating peeling off, excessive heating temperature, or damage to the coating during cleaning.
III. Power/Hydraulic System Failure (Semi-automatic/Fully Automatic Models Only)
These are core faults affecting equipment operation:
1. Oil Pump/Hydraulic Motor Not Working: Microswitch failure, loose power plug, loose internal wiring, motor capacitor failure; if the motor hums but the push rod does not move, it is generally due to insufficient hydraulic oil, loose hydraulic connection, or damaged hydraulic sensor.
2. Cylinder not working/Push rod not moving: Insufficient hydraulic oil, pressure regulating valve too loose, oil filter clogged, quick connector clogged, pressure relief valve not closed.
3. High pressure pipe/interface oil leakage: Damaged quick connector, aged and damaged seals; corresponding parts need to be replaced.
4. 380V three-phase motor reverses/Milling cutter moves but cylinder does not move: Power line phase sequence reversed; reverse the live wire phase sequence.
IV. Butt welding/cutting system failures directly affect welding accuracy:
1. Cutting cutter/milling cutter not working: Loose power plug, damaged drill, worn-out brushes, excessive cutting oil pressure causing motor to stop.
2. Cutting cutter suddenly stops/cannot cut shavings when plastic tube is moving forward or backward: Excessive oil pressure causing stoppage, incorrect blade height (more than 0.5mm above the plane or below the plane), worn and dull blade.
3. Pipe butt joint deviation exceeding 1mm: This is mostly due to improper operation. Adjusting the deviation by rotating the pipe should resolve the issue. If the deviation persists after adjustment, it indicates fixture wear or frame deformation.
4. Uneven milled end face: This is caused by worn milling cutter inserts, poor fixture coaxiality, or inappropriate milling pressure.
