Wiring Caution 1. As a rule, use electrical wire with a cross sectional area of 0.5 to 1.25 mm2 for wiring. Furthermore, do not allow excessive force to be applied to the lines. 2. Use electrical circuits which do not generate chattering in their contacts. 3. Use voltage which is within ±10% of the rated voltage. In cases with a DC power supply where importance is placed on responsiveness, stay within ±5% of the rated value. The voltage drop is the value in the lead wire section connecting the coil. 4. When a surge from the solenoid affects the electrical circuitry, install a surge voltage suppressor etc., in parallel with the solenoid. Or, adopt an option that comes with the surge voltage protection circuit. (However, a surge voltage occurs even if the surge voltage protection circuit is used. For details, please consult with SMC.) Warning 1. Do not apply AC voltage to Class “H” coil AC type unless it is built in full-wave rectifier, or the coil will be damaged. Recommended Unacceptable Fig. 2 Binding tubes with bands Straight portion Mounting pitch A Fig. 1 Recommended piping configuration Recommended Piping Conditions 1. When connecting tubes using One-touch fittings, provide some spare tube length shown in Fig. 1, recommended piping configuration. Also, do not apply external force to the fittings when binding tubes with bands etc. (see Fig. 2.) Tube size Mounting pitch A Unit: mm Nylon tubing Soft nylon tubing Polyurethane tubing 44 or more 84 or more 89 or more 112 or more 140 or more 168 or more 29 or more 39 or more 56 or more 58 or more 70 or more 82 or more 25 or more 39 or more 57 or more 52 or more 69 or more 88 or more Straight portion length o1/8" o6 o1/4" o8 o10 o12 16 or more 30 or more 32 or more 40 or more 50 or more 60 or more Series VX21/22/23 Specific Product Precautions 5 Be sure to read before handling. Refer to back cover for Safety Instructions. For 2 Port Solenoid Valves for Fluid Control Precautions, refer to “Handling Precautions for SMC Products” and the Operation Manual on SMC website, http://www.smcworld.com 47