Category
Solenoid Valve Supplier
inquiry@ato.com.cnAC or DC Solenoid Valves
In practical design and application, there are two main types of common
power supply for solenoid valves: AC (like 110V, 220V) and DC (like 12V,
24V). Due to high supply voltage and small voltage loss of cable
resistance in the transmission process, AC power supply almost will not
cause the solenoid valve drive voltage is insufficient, so that the
solenoid valve can not operate. But 220 V AC cable can not be mixed with
other instrument signal cables and needs to be laid separately, which
brings a lot of inconvenience in design and construction. The 24 V DC
supply cable does not need to be laid separately, but it is better to
calculate the solenoid supply voltage before deciding to use a 24 V DC
solenoid valve, especially in the case of long power supply distance.
The following is an example of calculating the supply voltage of a 24V DC solenoid valve.
Assuming that the cable diameter of solenoid valve is 2.5 mm2, the maximum DC resistance of cable is 7.41Ω/km, the cable transmission distance is 650m, and the rated power of the selected solenoid valve is 10W (the maximum DC resistance of cable and the rated power data of solenoid valve can be found by product manual). The calculation steps are as follows.
1. Calculation of working current of solenoid valve
P = IVS
I = P/VS = 10/24 = 0.416A
See in the formula,
I - Working current of solenoid valve (A)
P - Rated power of solenoid valve (W)
VS – Voltage of power supply (V)
2. Calculation of cable voltage drop
L = 650m ×2 = 1.3km
R = 1.3 ×7.41 = 9.63Ω
V = IR = 0.416 ×9.63 = 4. 0V
See in the formula,
L - Cable round-trip distance (m)
R - Cable resistance (Ω)
V - Cable voltage drop (V)
So the supply voltage of solenoid valve is
VS - V = 24 - 4.0 = 20.0V
As long as the minimum working voltage of solenoid valve is not less than 20.0 V, the solenoid valve can work normally.
3. Voltage fluctuation in power supply
It should be noted that in this case, the supply voltage of the power supply is 24 V and it is in an ideal condition. Actually, the output of the DC power supply device will fluctuate to a certain extent. If this factor is taken into account, the supply voltage of the solenoid valve will be less than 20.0 V.
Assuming that the fluctuation of the output of the DC power supply device (non-regulated power supply) is ±5%, it is re-calculated as follows in the case of -5%.
VSmin = 24 × (1 - 5 %) = 22. 8V
I = 10/ 22.8 = 0.438A
V = IR = 0.438 ×9.63 = 4.22V
See in the formula,
VSmin - the lowest power supply voltage (V)
So, the lowest power supply for solenoid valve is:
VSmin - V = 22.8 - 4.22 = 18.58 V
At this time, the lowest working voltage of solenoid valve must be no less than 18.58 V, so that the solenoid valve can work normally.
Assuming that the cable diameter of solenoid valve is 2.5 mm2, the maximum DC resistance of cable is 7.41Ω/km, the cable transmission distance is 650m, and the rated power of the selected solenoid valve is 10W (the maximum DC resistance of cable and the rated power data of solenoid valve can be found by product manual). The calculation steps are as follows.
1. Calculation of working current of solenoid valve
P = IVS
I = P/VS = 10/24 = 0.416A
See in the formula,
I - Working current of solenoid valve (A)
P - Rated power of solenoid valve (W)
VS – Voltage of power supply (V)
2. Calculation of cable voltage drop
L = 650m ×2 = 1.3km
R = 1.3 ×7.41 = 9.63Ω
V = IR = 0.416 ×9.63 = 4. 0V
See in the formula,
L - Cable round-trip distance (m)
R - Cable resistance (Ω)
V - Cable voltage drop (V)
So the supply voltage of solenoid valve is
VS - V = 24 - 4.0 = 20.0V
As long as the minimum working voltage of solenoid valve is not less than 20.0 V, the solenoid valve can work normally.
3. Voltage fluctuation in power supply
It should be noted that in this case, the supply voltage of the power supply is 24 V and it is in an ideal condition. Actually, the output of the DC power supply device will fluctuate to a certain extent. If this factor is taken into account, the supply voltage of the solenoid valve will be less than 20.0 V.
Assuming that the fluctuation of the output of the DC power supply device (non-regulated power supply) is ±5%, it is re-calculated as follows in the case of -5%.
VSmin = 24 × (1 - 5 %) = 22. 8V
I = 10/ 22.8 = 0.438A
V = IR = 0.438 ×9.63 = 4.22V
See in the formula,
VSmin - the lowest power supply voltage (V)
So, the lowest power supply for solenoid valve is:
VSmin - V = 22.8 - 4.22 = 18.58 V
At this time, the lowest working voltage of solenoid valve must be no less than 18.58 V, so that the solenoid valve can work normally.
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