The correct position should be observed when the unit is loaded, and the oil level should not be higher than half at this time; The return pipe is blocked; The device of the return pipe (distance from the bottom of the oil separation core) does not meet the requirements; The exhaust pressure is too low when the unit is running; The oil separation core is broken; The separator inside the cylinder is damaged; The unit has oil leakage; Coolant disintegration or extended use.

1. Fault phenomenon: the unit exhaust temperature is high (more than 100 ° C) the coolant level of the unit is too low (it should be seen from the oil speculum but not more than half) the oil cooler is dirty; The oil filter core is blocked; The temperature control valve is faulty (component is bad) the oil cut-off solenoid valve is not powered or the coil is damaged; The diaphragm of the oil cut-off solenoid valve is broken or aged; Fan motor failure; Cooling fan is damaged; The exhaust duct is not dredged or the exhaust resistance (back pressure) is large; The ambient temperature exceeds the specified range (38 ° C or 46 ° C) The temperature sensor is faulty (control unit) The pressure gauge is faulty (relay control unit)

2. Fault phenomenon: large fuel consumption of the unit or large oil content of compressed air cooling dose too much.

3. Fault phenomenon: the unit pressure is low, the actual gas consumption is greater than the output gas of the unit; Discharge valve failure (can not be closed when loading) intake valve failure; Hydraulic cylinder failure; Load solenoid valve (1SV failure · Minimum pressure valve is stuck; There is a leak in the user network; The pressure setting is too low; Pressure sensor failure (control unit) Pressure gauge failure (relay control unit) Pressure switch failure (relay control unit) Pressure sensor or pressure gauge input hose leakage;

4. Fault phenomenon: unit exhaust pressure is too high intake valve failure; Hydraulic cylinder failure; Load solenoid valve (1SV failure; The pressure setting is too high; Pressure sensor failure (Intellisi control unit) Pressure gauge failure (relay control unit) Pressure switch failure (relay control unit)

5. Fault phenomenon: the unit current is too high and the voltage is too low; The wiring is loose; The unit pressure exceeds the rated pressure; The oil separation core is blocked; Contactor failure; Host failure; Main motor failure;

6. Fault phenomenon: the unit can not start the fuse wire is broken; The temperature switch is broken; Wiring loose; Main motor thermal relay action; Fan motor thermal relay action; The transformer is broken;

No power input (control unit) fault not eliminated (control unit) Controller fault.

7. Fault phenomenon: When the unit starts, the current is large or the user's air switch is tripped; Input voltage is too low; The star-triangle conversion interval is too short (should be 10 ~ 12 seconds) the hydraulic cylinder failure (no reset) the intake valve failure (opening degree is too large or stuck) The cable is loose; Host failure; Main motor failure; 1P time relay is broken (relay control unit)8 Fault phenomenon: fan motor overload fan deformation; Fan motor failure; Fan motor thermal relay fault (aging) loose wiring; The cooler is blocked; High exhaust resistance.

1. Fault phenomenon: the dryer does not run, the compressor line is disconnected, the safety wire is burned, the thermal relay is operated, the high voltage switch is operated, the compressor is blocked, and the line is virtual or loose

2. Fault phenomenon: the dryer will stop within a short time after starting. The ambient temperature is too high, the condenser is blocked, the compressor is overloaded, the refrigerant is lacking, the low pressure is too low, the air intake is too large, and the compressor is stuck

3. Fault phenomenon: The compressor does not start the wiring is incorrect, the voltage is too low, the starting capacitor is damaged, the relay or contactor is not closed, the starting winding is open, and the phase is missing

4. Fault phenomenon: the compressor repeatedly starts and stops due to overload maintenance actions Low voltage or three-phase imbalance · Other electrical equipment is connected to the overload maintenance device · Overload maintenance device fails · Operating capacitor is too small · exhaust pressure is too high · Short circuit between windings · thermal relay contacts are firmly stuck

5. Fault phenomenon: the relay burn voltage is too high or too low, the operation capacitor is not correct, and the repeated start and stop (refer to 2 and 3 relay specifications do not match, the device seat is incorrect 6. Fault phenomenon: capacitor burned out specifications do not match high voltage 7. Fault phenomenon: exhaust pressure is too high, refrigeration dose is too much, there is air in the refrigeration system, condenser dirty, ambient temperature is too high, fan pressure switch is faulty, fan motor failure, fan rotation direction is incorrect, cooling water flow regulating valve failure 8. Fault phenomenon: the exhaust pressure is too low cooling dose is too low. The fan pressure switch is faulty

Maintenance guide Screw machine maintenance guide. Daily care content. Monthly care content. Quarterly maintenance content. Take care of the content every year.

Precautions Daily care content:

1. Check the level of air filter and coolant;

2. Check hoses and all fittings for leakage;

3. Check records, if the consumable parts have reached the replacement cycle and must be stopped for replacement;

4. Check records, when the exhaust temperature of the main engine reaches or is close to 98°C, the oil cooler must be cleaned;

5. Check the records, if it is found that the pressure difference of the separator reaches more than 0.6BAR (limit 1BAR or the pressure difference begins to decline, the separator core should be stopped and replaced;

6. Check the condensate discharge situation, if it is found that the displacement is too small or there is no condensate discharge, it is necessary to stop the water separator to clean;

Monthly Care Content:

1. Check the surface of the oil cooler and clean it if necessary;

2. Cooler after cleaning;

3. Clean the water separator;

4. Check all wire connections and tighten them;

5. Check AC contactor contacts;

6. Clean the dust on the surface of the motor suction tuyere and the surface of the shell;

7. Clean the return oil filter;

Quarterly maintenance contents:

1. Main motor grease;

2. Clean the main motor and fan motor;

3. Replace the coolant;

4. Replace the oil filter element;

5. Clean the oil cooler;

6. Check the minimum pressure valve;

7. Check the sensor.

Annual care content:

1. Replace the coolant (Ultra Cool;

2. Check the check valve;

3. Check the cooling fan.

4. Check the hydraulic cylinder or stepper motor and stepper limit device;

5. Safety valve calibration (sent to the designated unit of the Labor Bureau for compulsory inspection)