The rated voltage of the solenoid valve coil is DC12V, DC24V, AC24V (50/60Hz), AC110V (50/60Hz), AC220V (50/60Hz), AC380V (50/60Hz).
Generally, in electrical design, either AC220V (no need to install switching power supply, low cost, simple circuit and easy maintenance) or DC24V (commonly used safety voltage, switching power supply/solenoid valve coil are easy to repair and replace).
How to detect the quality of solenoid valve
First, energize the solenoid valve with the controlled medium (pressure liquid, gas
Common faults of solenoid valves include
1. Coil short circuit or open circuit
Detection method: First use a multimeter to measure its continuity. If the resistance approaches zero or infinity, it means the coil is short-circuited or open-circuited. If the resistance value measured is normal (about tens of ohms), it does not mean that the coil must be good (I once measured a solenoid valve coil resistance of about 50 ohms, but the solenoid valve could not operate. After replacing the coil, everything was normal. ), please perform the final test below.
Find a small screwdriver and place it near the metal rod that goes through the solenoid valve coil, and then energize the solenoid valve. If you feel magnetism, the solenoid valve coil is good, otherwise it is bad.
Solution: Replace the solenoid valve coil.
2. There is a problem with the plug/socket
Fault phenomenon: If the solenoid valve is the type with a plug/socket, there may be problems with the metal reed of the socket (the author has encountered it), problems with the wiring on the plug (such as connecting the power cord to the ground wire), etc. The reason is that power cannot be sent to the coil.
It is best to develop a habit: screw on the fixing screw after inserting the plug into the socket, and screw on the fixing nut on the coil after the valve stem.
If the plug of the solenoid valve coil is equipped with a LED power indicator light, then it must be connected correctly when using DC power to drive the solenoid valve, otherwise the indicator light will not light up.
In addition, do not exchange power plugs with LED power indicators of different voltage levels. This may cause the LED to be burned or the power supply (use a low-voltage plug) to be short-circuited or the LED light will be very weak (use a low-voltage plug). high voltage plug).
If there is no power indicator light, the solenoid valve coil does not need to distinguish the polarity (unlike the transistor time relay whose coil voltage is DC and the intermediate relay whose coil voltage is DC with a diode/resistor leakage circuit in parallel with the coil < this kind of intermediate relay Most of them are original Japanese ones, so you need to distinguish the polarity).
Solution: Correct wiring errors, repair or replace plugs and sockets.
3. Valve core problem
Fault phenomenon 1: When the pressure of the medium passed by the solenoid valve is normal, if the red manual button of the solenoid valve is pressed, the solenoid valve does not respond (the pressure medium does not change on and off), indicating that the valve core must be bad.
Treatment method: Check whether there are any problems with the medium, such as whether there is a lot of water in the compressed air (sometimes the oil-water separator does not play a great role, especially when the pipeline design is poor, the compressed air flowing to the solenoid valve will have a lot of water. (water), whether there are many impurities in the liquid medium.
Then clear the accumulated water or impurities in the solenoid valve and pipeline. If it still doesn't work, please repair it (if you have time, patience and if necessary@_@) or replace the valve core, or simply replace the entire solenoid valve.
Fault phenomenon 2: After inspection, it is found that the coil is the original coil and the magnetism of the coil is normal when the coil is energized, but the solenoid valve still does not operate (at this time, the function of the solenoid valve manual button may be normal), indicating that the valve core is bad.
Solution: Please repair or replace the valve core, or simply replace the entire solenoid valve.
As for the maintenance of the solenoid valve body, there are too many types and there are so many maintenance methods that I can’t explain, so I won’t go into details here.
Solenoid valve troubleshooting and troubleshooting
1. The solenoid valve does not work after being energized.
Check if the power wiring is bad → Rewire and connect the connector
check
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