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R R R R R R . (Anode) + (Cathode) Countermeasure parts Diode .2 V Surge voltage 24 V 0 V .2 V Surge voltage 24 V 0 V .2 V 24 VDC Large capacity Load: Holding sol.2: Non-holding sol.1: Holding Surge voltage 24 V 0 V 24 VDC Output circuit .60 V 24 V 0 V .60 V 24 V 0 V .60 V 24 V 0 V Surge voltage Surge voltage Surge voltage Power supply circuit breaker Relay Output circuit Internal circuit Power supply circuit breaker Relay Large capacity Load: Holding sol.2: Non-holding sol.1: Holding Internal circuit 5. Surge voltage intrusion Applicable series (non-polar type solenoid valves) VQ100 and 3/4/5 port solenoid valves VQ(C), VQZ, VQD (2 W type) series SY100, V100, and 3/4/5 port solenoid valves SY, SYJ, SX, SZ, SV, SJ, VF, VP series With non-polar type solenoid valves, at times of sudden interruption of the loading power supply, such as emergency shutdown, surge voltage intrusion may be generated from loading equipment with a large capacity (power consumption), and the solenoid valve in a deenergized state may switch over (see Figure 1). When installing a breaker circuit for the loading power supply, consider using a solenoid valve with polarity (with polarity protection diode), or install a surge absorption diode between the loading equipment COM line and the output equipment COM line (see Figure 2). Caution 3. Solenoid valve drive for AC with a solid state output (SSR, TRIAC output, etc.) 1) Current leakage When using a snubber circuit (C-R element) for surge protection of the output, a very small amount of electrical current will continue to flow even during the OFF state. This results in the valve not returning. In a situation where the tolerance is exceeded, as in the above case, take measures to install a bleeder resistor. 2) Minimum allowable load amount (Min. load current) When the consumption current of a valve is less than the output’s minimum allowable load volume or the margin is small, the output may not switch normally. Please contact SMC. 3) Solenoid valve with full wave rectifier circuit When the solenoid valve built-in full wave rectifier circuit with the AC specifications is used, the solenoid valve return failure may occur depending on the kind of the triac output circuit. Carefully check this point when selecting a SSR or sequencer. For details, contact the SSR or sequencer manufacturer. 4. Surge voltage suppressor 1) A surge voltage suppressor built into the valve is intended to protect the output contacts so that the surge generated inside valve does not adversely affect the output contacts. Therefore, if an overvoltage or overcurrent is received from an external peripheral device, the surge voltage protection element inside the valve is overloaded, causing the element to break. In the worst case, the electric circuit enters the short-circuit status by the breakage. If the energizing continues in this status, a large current flows. This may cause secondary damage to the output circuit, external peripheral device, or valve, and may also cause fire accident. So, take appropriate protective measures, such as installation of an overcurrent protection circuit in the power supply or drive circuit to maintain the sufficient safety. 2) If a surge protection circuit contains nonstandard diodes, such as Zener diodes or varistor, a residual voltage that is in proportion to the protective circuit and the rated voltage will remain. Therefore, take into consideration the surge voltage protection of the controller. In the case of diodes, the residual voltage is approximately 1 V. Figure 1. Surge intrusion circuit example (NPN outlet example) Figure 2. Surge intrusion circuit example (NPN outlet example) Design/Selection 3/4/5 Port Solenoid Valves Precautions 3 Be sure to read this before handling. 4