Changzhou normal temperature water-cooled dryer maintenance

Changzhou normal temperature water-cooled dryer repair
Solutions to the problem that the refrigerated dryer cannot be turned on
The phenomenon that the dryer cannot be turned on is generally related to the electronic control system. If it trips when it is turned on, it is usually the user's power supply The air switch selection is too small, or the refrigerant compressor may be short-circuited and burned out. The above situations can be checked separately. Whether the compressor is burned out can be confirmed by using a multimeter to check the three-phase resistance and grounding resistance. If the phase-to-phase resistance is infinite or the grounding resistance is zero, then it can be determined that the compressor is burned out. < When handling the system after the new compressor is burned out, you should try to clean the inside of the system and replace the refrigerant drying filter, and then vacuum and add fluorine, otherwise it will Affect the service life of refrigeration compressor.
If the machine does not respond after pressing the start button, you should first observe whether there is an alarm indicator light on the machine panel. If the high-voltage alarm light is on, you must find the high-voltage protection switch (usually on the upper part of the electrical box) to protect it. There is a green reset button on the switch. Press it to reset and start. If the overload indicator light is on, find the thermal overload relay in the electrical junction box and press the red button on it. Also, if the low-voltage protection light is on, it means that part or all of the Freon has leaked. In this case, the leakage point needs to be found. See item 1 for specific methods.
If the dryer still cannot start after all alarms have been resolved, then confirm the incoming power supply, confirm whether the red indicator light of the shutdown power supply is on, and check whether the two-phase or three-phase power supply voltage is normal and whether there is any phase loss. For three-phase power supply, please confirm whether the phase sequence protector is working because it has phase sequence protection. If the phase sequence protector indicator light does not light up, it means that the incoming line phase sequence is wrong. At this time, just change any two phases of the three-phase power cord. That’s fine (note that you only need to change two phases).
If the phase sequence protector is working normally and still does not respond when you press start, you can use a screwdriver to force the contactor to close (push the movable part of the contactor in). If the compressor can start, the problem lies in the control circuit. Next, check the control circuit, starting with the start button. Press the start button. A normal button should be easy to press, and it will bounce back naturally immediately after you let go. If there is lag in the whole process, it is likely that the button is pressed. New. If there is no hysteresis, continue checking. Then you can short-circuit the wiring behind the start button. Generally, there is a wiring behind the start button. The two next to it are button indicator wires. Don't worry about it. Short-circuit the two wires in the middle. If the machine can If it is started, it can be determined that the button is damaged and the button can be replaced. If it still cannot start after a short circuit, then continue to check the circuit inside the electrical junction box. First, gently pull each terminal with your hands to see if there is any loose wiring. Then check the AC contactor and thermal overload relay. First, check these two Check whether the components are internally scorched, and then use a multimeter to check whether the pull-in circuit can be connected and whether the normally closed and normally open contacts are normal. Once a problem is found with these two components, it is usually just a matter of replacement. A common method is to directly replace the suspected damaged component with a new or confirmed good contactor or relay. If the fault can be solved at this time, It means the part you replaced is broken.
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