Wiring Caution 1. Polarity When connecting power to a solenoid valve with a DC specification and equipped with a light or surge voltage suppressor, check for polarity. If there is polarity, take note of the following. No diode to protect polarity: If a mistake is made regarding the polarity, damage may occur to the diode in the valve, the switching element in a control device or power supply equipment, etc. With diode to protect polarity: If polarity connection is wrong, the valve does not operate. 2. Applied voltage When electric power is connected to a solenoid valve, be careful to apply the proper voltage. Improper voltage may cause malfunction or coil damage. 3. Check the connections. Check if the connections are correct after completing all wiring. 4. External force applied to lead wire If an excessive force is applied to the lead wire, this may cause faulty wiring. Take appropriate measures so that a force of 30 N or more is not applied to the lead wire. When instructions are given to the Specific Product Precautions, follow these specifications. Lubrication Warning 1. Lubrication [Rubber seal] 1) All valves except those listed below have been lubricated for life by the manufacturer and therefore, do not require lubrication while in service. 2) If a lubricant is used in the system, use class 1 turbine oil (no additive), ISO VG32. For details about lubricant manufacturers’ brands, refer to SMC website. Additionally, please contact SMC for details about class 2 turbine oil (with additives) ISO VG32. Once lubricant is utilized within the system, since the original lubricant applied within the product during manufacturing will be washed away, please continue to supply lubrication to the system. Without continued lubrication, malfunctions could occur. [Metal seal] 1) These valves can be used without lubrication. 2) If a lubricant is used in the system, use class 1 turbine oil (no additive), ISO VG32. For details about lubricant manufacturers’ brands, refer to SMC website. Additionally, please contact SMC for details about class 2 turbine oil (with additives) ISO VG32. Valves to be lubricated VP4�ｭ50, VP4�ｭ70, VP31�ｭ5, VPA4�ｭ50, VPA4�ｭ70, VPA31�ｭ5 3/4/5 Port Solenoid Valves Precautions 5 Be sure to read this before handling. Air Supply Warning 1. Type of fluids Please consult with SMC when using the product in applications other than compressed air. 2. When there is a large amount of drainage. Compressed air containing a large amount of drainage can cause malfunction of pneumatic equipment. An air dryer or water separator should be installed upstream from filters. 3. Drain flushing If condensation in the drain bowl is not emptied on a regular basis, the bowl will overflow and This may cause malfunction of pneumatic equipment. If the drain bowl is difficult to check and remove, installation of a drain bowl with an auto drain option is recommended. For compressed air quality, refer to SMC Best Pneumatics catalog. 4. Use clean air. Do not use compressed air that contains chemicals, synthetic oils including organic solvents, salt or corrosive gases, etc., as it can cause damage or malfunction. Lubrication Warning Warning 1. The solenoid valve is an electrical product. For safety, install an appropriate fuse and circuit breaker before use. Caution 1. When extremely dry air is used as the fluid, degradation of the lubrication properties inside the equipment may occur, resulting in reduced reliability (or reduced service life) of the equipment. Please consult with SMC. 2. Install an air filter. Install an air filter upstream near the valve. Select an air filter with a filtration size of 5 μm or smaller. 3. Take measures to ensure air quality, such as by installing an aftercooler, air dryer, or water separator. Compressed air that contains a large amount of drainage can cause malfunction of pneumatic equipment such as valves. Therefore, take appropriate measures to ensure air quality, such as by providing an aftercooler, air dryer, or water separator. 4. If excessive carbon powder is seen, install a mist separator on the upstream side of the valve. If excessive carbon dust is generated by the compressor, it may adhere to the inside of a valve and cause it to malfunction. For compressed air quality, refer to SMC Best Pneumatics catalog. 2. Lubrication amount If the lubrication amount is excessive, the oil may accumulate inside the pilot valve, causing malfunction or response delay. So, do not apply a large amount of oil. When a large amount of oil needs to be applied, use an external pilot type to put the supply air on the pilot valve side in the non-lube state. This prevents accumulation of oil inside the pilot valve. A 6