Does the DC24V solenoid valve have positive and negative poles
Question: The DC24V power supply for SMC solenoid valves is a DC power supply with positive and negative poles. However, in reality, when wiring 24V solenoid valves on site, there is no positive or negative pole distinction. Just connect them randomly, and the solenoid valve can work normally. Why is that?
Answer: The wiring of SMC solenoid valves has no positive or negative distinction; it doesn't matter how they are connected. After being powered on, the square block inside the Japanese SMC solenoid valve is understood as an automatic switch. You can understand it this way: when current flows through the coil, according to the direction of the N and S poles of the electromagnetic induction; However, for the armature, both the N pole and the S pole will exert suction on it. Therefore, some of these are marked with AC/DC 24V power supply. This type uses DC24V and does not need to consider positive or negative. The internal circuit has anti-forward and anti-reverse protection and does not distinguish between positive and negative.
Question: Do all brands of DC24V power supply voltage solenoid valves have no distinction between positive and negative poles, or do some brands have no distinction?
Answer: Only SMC DC solenoid valves do not need to consider polarity. No matter how they are connected, it will not affect their use and indication.
1. Since it is an electromagnet, there is no direction.
2. It's just that the SMC solenoid valve in Japan uses a full bridge, and the wiring of the indicator light is random.
Is the positive and negative terminals of the dc24v solenoid valve connected randomly
Connect terminals B and D to the positive terminal, and terminals A and C to the negative terminal.
Ordinary DC24V solenoid valves indeed have no positive or negative distinction and can all work normally. However, not all DC24V solenoid valves can be connected without distinction between positive and negative. This mainly depends on the circuit inside the coil. Because some solenoid valves are not entirely coils but also have some electronic circuits inside. Therefore, when in use, it is better to connect according to the label.
There is a red or white light-emitting diode on the solenoid valve connected in series with a resistor and across the coil. Generally, the positive terminal is connected to the "H" marked terminal on the solenoid valve (or the end connected to the resistor), and the negative terminal is connected to the "L" marked terminal on the solenoid valve (or the end connected to the diode). This eliminates the reverse self-induced electromotive force generated by the electromagnetic coil when the control circuit is disconnected.
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