SM-P00077-A/3
3. USAGE
62
2020-04-15
3.1.2
Electric circuit
CAUTION
Check for leakage currents from external control devices to prevent a malfunction.
When a programmable controller or a similar control device is used, a leakage current may prevent the
valve from operating correctly even if the solenoid valve is de-energized.
When controlling solenoid valves using a programmable controller or a similar control device, make
sure that the leakage current from the programmable controller output is as specified in the table below.
For 100 VAC
1.2 mA or less
For 200 VAC
For 3 VDC
8.3 mA or less
For 5 VDC
5.0 mA or less
For 12 VDC
1.8 mA or less
For 24 VDC
1.2 mA or less
The surge suppressor limits the surge voltage generating from the solenoid valve, which can reach
several hundred volts, to a low voltage level bearable for output contacts. However, this function may be
insufficient for some output circuits and the voltage may cause breakage or malfunction of the product.
Check the surge voltage limitation level of the solenoid valve to be used, the withstand voltage and
circuit configuration of the output devices, and the reset delay time to determine serviceability.
If necessary, take a different measure against surge. The 4G R Series solenoid valves equipped with a
surge suppressor suppress the terminal-to-terminal reverse voltage surge generated upon shut off, to
the level shown in the table below.
For 3 VDC
Approx. 6.2 V
For 5 VDC
Approx. 13 V
For 12 VDC
Approx. 27 V
For 24 VDC
Approx. 47 V
When option S or E is selected
Approx. 1 V
For an NPN type output unit, install an additional contact protection circuit since the output transistor is
susceptible to the surge voltage of the sum of the voltage specified in the table above and the source
voltage.
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Example 1 of additional output transistor protection circuit
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Example 2 of additional output transistor protection circuit
• When energizing a double-solenoid type instantaneously, the energizing time must be 0.1 second or
longer. It is recommended to energize while the cylinder is operating when the back pressure of
another solenoid valve is conceivable.
• When energizing continuously, the surface temperature of the manifold increases.
This is not abnormal, but appropriate ventilation or heat dissipation measures must be considered.
Leakage
current
Contact
C
R
Programmable
controller side
Solenoid valve
CR circuit
Solenoid valve side
Programmable
controller side
Programmable
controller side
Solenoid valve side
