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1. Low voltage: The rated operating voltage of a typical compressor is 380V, with a permissible fluctuation of about 5%.

2. Loose wiring: Check the input power cord for signs of overheating or burning.

3. Unit pressure exceeding rated pressure: For example, a machine rated at 0.7MPa may experience overload if the actual pressure reaches 0.75MPa.

4. Oil separator clogged: Don't assume that recently replaced parts are clog-free. A dirty working environment and impurities in the oil-gas separator can easily cause blockage.

5. Contactor malfunction: Replace with a new one…

The lubricating oil is too thin (the oil temperature is high and the grade does not meet the requirements).
2. Excessive oil pressure in the lubricant.
3. The gap between the piston and the cylinder is too large;
4. Cylinder is out of round or has excessive wear;
5. Cylinder Oil Leakage:
(The piston rings have been excessively worn and have lost their elasticity.)
(2) The piston ring is firmly engaged in the ring groove.
(3) The gap between the piston ring and the ring groove is too large;
(4) Installing the wrong piston ring.
6. Excessive clearance in the crankshaft bearing or connecting rod bearing;
7. Excessive temperature in the crankcase or poor ventilation;
8. If the oiling rod lubricated by splash lubrication is too long or if the oil level in the crankcase is too high, it will cause problems.

Abnormal exhaust temperature means that it is higher than the designed value. In theory, the factors that affect the increase of exhaust temperature include: intake air temperature, pressure ratio, and compression index (for air compression index K = 1.4). In reality, factors that affect the high intake air temperature include: low intermediate cooling efficiency, or excessive scale deposits in the intercooler affecting heat exchange, then the intake temperature of the subsequent stages will inevitably be high, and the exhaust temperature will also be high. Additionally, valve leakage and piston ring leakage not only affect the increase of exhaust temperature, but also cause pressure changes between stages. As long as the pressure ratio is higher than the normal value, the exhaust temperature will increase. Moreover, for water-cooled machines, insufficient water or insufficient water volume will cause the exhaust temperature to rise.

If the volume of gas discharged by the compressor cannot meet the flow requirements of the user at the rated pressure, the exhaust pressure will inevitably have to be reduced. At this point, another machine with the same exhaust pressure but a larger volume must be replaced. The main reason for abnormal inter-stage pressure is leakage of the valve or leakage after the piston ring wears out. Therefore, the causes should be sought from these aspects and measures should be taken.

Where there is friction such as between the crosshead and the slide plate, or between the packing and the piston rod, if the temperature exceeds the specified value, it is called overheating. The consequences of overheating are as follows: one is to accelerate the wear between the friction pairs; the other is that the accumulated heat energy continuously accumulates until it burns the friction surface, causing major accidents to the machine. The main reasons for bearing overheating are: the non-uniform fit between the bearing and the shaft neck or the small contact area; the bearing is skewed or the crankshaft is bent, the viscosity of the lubricating oil is too low, the oil passage is blocked, the oil pump has a malfunction and causes oil supply interruption, etc.; during installation, the level was not adjusted, the clearance was not found properly, the main shaft and the motor shaft were not aligned, and the two shafts were tilted, etc.

If certain components of the compressor malfunction, abnormal noises will be emitted. Generally speaking, operators can identify these abnormal noises. For instance, if the gap between the piston and the cylinder head is too small and there is direct impact; if the connecting nut of the piston rod and the piston is loose or disengaged; if the threaded plug at the piston end is damaged, and the piston moves upward and collides with the cylinder head; if metal fragments fall into the cylinder or water accumulates in the cylinder, all these can cause knocking sounds inside the cylinder. In the crankcase, if the bolts, nuts, connecting rods, and crosshead bolts of the crankshaft are loose, disengaged, or broken, and if the shaft diameter is severely worn and the gap increases, or if the clearance between the crosshead pin and the bushing is too large or severely worn, etc., all these can cause knocking sounds in the crankcase. If the exhaust valve plate breaks, the valve spring is soft or damaged, or the load regulator is set improperly, etc., all these can cause knocking sounds in the valve chamber. By identifying the faults and taking measures accordingly.