Failure analysis and troubleshooting of screw air compressor

1. Trouble phenomenon: the unit pressure is low. (The actual air consumption is greater than the output air volume of the unit; the air release valve is faulty (cannot be closed when loading; the intake valve is faulty; the hydraulic cylinder is faulty; the load solenoid valve (1SV) is faulty; the minimum pressure valve is stuck; the user pipe network is leaking; the pressure setting Too low; pressure sensor failure; pressure gauge failure; pressure switch failure.

2. Trouble phenomenon: The exhaust temperature of the unit is higher than 100 degrees. (The coolant level of the unit is too low (should be visible from the oil sight glass, but not more than half; the oil cooler is dirty; the oil filter core is blocked; the temperature control valve is faulty (the component is broken); the oil cut-off solenoid valve is not available Electricity or coil damage; oil cut solenoid valve diaphragm rupture or aging; fan motor failure; cooling fan damage; exhaust ducts are not unblocked or exhaust resistance (back pressure) is large; the ambient temperature exceeds the specified range (38°C or 46°C); The temperature sensor is faulty.

3. Trouble phenomenon: the unit has a large fuel consumption or the compressed air has a large oil content. (The amount of coolant is too much. The correct position should be observed when the unit is loaded. At this time, the oil level should not be higher than half; the oil return pipe is blocked; the installation of the oil return pipe (distance from the bottom of the oil separation core) does not meet the requirements; when the unit is running The exhaust pressure is too low; the oil separation core is broken; the internal partition of the separation cylinder is damaged; the unit has oil leakage; the coolant has deteriorated or has been used for an extended period of time.

4. Failure phenomenon: The unit pressure is low. (The actual air consumption is greater than the output air volume of the unit; the air release valve is faulty (cannot be closed when loading; the intake valve is faulty; the hydraulic cylinder is faulty; the load solenoid valve (1SV) is faulty; the minimum pressure valve is stuck; the household pipe network is leaking; the pressure setting Too low; pressure sensor failure (Intellisys control unit); pressure gauge failure (relay control unit); pressure switch failure (relay control unit); pressure sensor or pressure gauge input hose leakage.)

5. Failure phenomenon: The exhaust pressure of the unit is too high. (Inlet valve failure; hydraulic cylinder failure; load solenoid valve (1SV) failure; pressure setting too high; pressure sensor failure (Intellisys control unit); pressure gauge failure (relay control unit); pressure switch failure (relay control unit).

6. Failure phenomenon: the unit current is large. (The voltage is too low; the wiring is loose; the unit pressure exceeds the rated pressure; the exhaust pressure is too low when the unit is running; the oil separation core is blocked; the contactor is faulty; the host is faulty; the main motor is faulty.

7. Failure phenomenon: The unit cannot be started. (The fuse wire is broken; the temperature switch is broken; the wiring is loose; the thermal relay of the main motor operates; the thermal relay of the fan motor operates; the transformer is broken;)

8. Fault phenomenon: The current is large or tripping when the unit starts. (User air switch problem; input voltage is too low; star-delta conversion interval is too short (should be 10-12 seconds); hydraulic cylinder failure (not reset); intake valve failure (opening too large or stuck); Loose wiring; host failure; main motor failure; 1TR time relay is broken (relay control unit).

9. Fault phenomenon: The fan motor is overloaded. (The fan is deformed; the fan motor is faulty; the thermal relay of the fan motor is faulty (aging); the wiring is loose; the cooler is blocked; the exhaust resistance is large.