Generally, there are the following factors:

1.Controller fault or setting too high

2.Temperature sensor failure

3.Regeneration flow too low

4. Heater failure

5.Contactor failure

How to find the influencing factors:

1.The set value of heating temperature of the controller is too high

2.Check by measuring the resistance value of temperature sensor

3.Check the regeneration gas flow regulating valve

4.Check that the heater resistance is correct

5.Check whether the contactor operates flexibly

Solution:

Reset the operating parameters of the controller and replace it if necessary

Replace the temperature sensor

Adjust regeneration flow

Replace the heater

Replace contactor

Generally, there are the following factors:

1.Inlet air flow too high

2.Low inlet pressure

3.Inlet air temperature too high

4.Excessive moisture content

5.The adsorbent is contaminated by oil

6.Filter failure

7.Incorrect dew point indication

How to find the influencing factors:

It refers to that the flow of compressed air into the dryer is greater than the standard treatment capacity of the dryer

Refers to the pressure of compressed air into the dryer

Refers to the temperature of compressed air entering the dryer

Refers to the saturated water content of compressed air entering the dryer

Refers to the adsorbent in the adsorption tower

It refers to the working effect of the filter before and after the dryer.

Wrong installation of dew point indicator

Solution:

Check the discharge of compressor outlet

Control pressure

Check compressor outlet

Check the after cooler and pre filter drain valve

Depressurize the dryer and check whether the desiccant is discolored or poisoned

Replace the filter core

Check again

Generally, there are the following factors:

The filter screen of desiccant diffuser is blocked

Compressed air handling capacity exceeds rated flow

Regeneration pneumatic valve remains open

Check valve action failure

How to find the influencing factors:

Check by pressure gauge of adsorption cylinder and outlet pressure gauge of dryer

Use flowmeter to detect

Check whether the control pneumatic valve works normally by manual method

Remove check one way valve for inspection

Solution:

Replace the desiccant diffuser

Check the condition of inlet gas volume

Check the pilot air circuit or solenoid valve and replace as required

Check check valve, repair and replace as required

Generally, there are the following factors

The regeneration exhaust valve cannot be closed during the pressure accumulation process

The outlet flow exceeds the maximum capacity of the dryer

One way check valve damaged

How to find influencing factors

Check whether the exhaust valve works normally by manual method

Use flowmeter to detect

Remove check valve for inspection

Solution

Check the pilot air circuit or solenoid valve and replace as required

Check the air inlet volume

Check check valve, repair and replace as required

Generally, there are the following factors

The controller failure causes the conversion time out of control, and the air in the tower produces adsorbent impact friction due to unstable pressure.

Pressure equalizing time is too short

How to find the influencing factors:

Use a multimeter to measure whether the control output of the controller is normal

Check whether the controller setting parameters are reasonable

Solution:

Check, repair and replace the controller

Adjust the parameters and prolong the equalizing time

Cause analysis

The air flow is too small or the load is too light.

The hot gas bypass valve is not open or poor, and the expansion valve is opened too much

The drain outlet of evaporator is blocked, and excessive water accumulated will cause ice blockage

Solution:

Increase compressed air flow or load

Adjust the hot gas bypass valve and expansion valve or replace it

Dredge the drain and drain the condensate of evaporator

Cause analysis

High pressure side valve blocked

Blockage of drying filter

Solution:

Open the valve to remove the blockage

Replacement

Cause analysis

The power supply lacks phase or the voltage exceeds the allowable range

Incorrect wiring

The relay or contactor does not pull in

If the compressor is started by capacitor, the starting capacitor is damaged

Poor high and low voltage protection switch

Mechanical failure of compressor, such as cylinder sticking

Solution:

Check the power supply to make the power supply voltage within the rated range

Check the circuit according to the circuit diagram

Check the cause, replace or repair

Replace the starting capacitor

Adjust the set value of pressure switch or replace the pressure protection switch

Replace the compressor

Cause analysis

Insufficient or leaking refrigerant

The air flow is too small or the load is too light

Hot gas bypass valve not open or poor

The ambient temperature is too low

Solution

Leak detection and vacuum again to add refrigerant

Increase compressed air flow or load

Adjust the hot gas bypass valve or replace it

Reduce the cooling water flow or turn off the cooling water