Pneumatic Clean Series

26Auto Switch/Common Precautions 3Be sure to read before handling. Refer to pages 7 to 16 of Front matter for safety instructions andcommon precautions for clean series. Refer to the main text for precautions for each series.WarningEnvironmentqNever use in an atmosphere with explosive gases.The construction of auto switches is not designed to preventexplosion. Never use in an atmosphere with explosive gasessince it may cause a serious explosion.wDo not use in an area where a magnetic field isgenerated.It can cause the auto switch to malfunction or demagnetize themagnet inside the cylinder. (Consult SMC regarding theavailability of magnetic field resistant auto switches.)eDo not use switches in applications where theswitch is continually exposed to water splash orspray.Although switches except D-A3, A44, G39, K39 satisfy theIEC standard IP67 enclosure (JIS C 0920: anti-immersionenclosure), do not use switches in applications where they arecontinually exposed to water splash or spray. Poor insulation orswelling of the potting resin inside switches may cause malfunction.rDo not use in an environment with oil or chemicals.Consult SMC if auto switches will be used in an environmentwith coolant, washing solvent, various oils or chemicals. If autoswitches are used under these conditions for even a short time,they may be adversely affected, resulting in poor insulation,malfunction due to swelling of the potting resin or hardening ofthe lead wires.tDo not use in an environment where there isexcessive impact shock.Consult SMC if switches are used where there are temperaturecycles other than normal temperature changes, as they may beadversely affected by improper insulation, malfunction due toswelling of the potting resin, or hardening of the lead wires.yDo not use in an environment where there isexcessive impact shock.When excessive impact (300m/s 2 ) is applied to a reed switch duringoperation, the contact point will malfunction and turn the signal on oroff momentarily (for 1ms or shorter). Consult SMC regarding theneed to use a solid state switch depending upon the environment.uDo not use in an environment where surges aregenerated.Where there are units (Solenoid lifter, high frequency inductionfurnace, motor, etc.) which generate a large amount of surge inthe area around cylinders with solid state auto switch, theswitch may deteriorate or be damaged. Avoid sources of surgegeneration and disorganized lines.iAvoid close contact with magnetic substances.When a magnetic substance (an object that can be attracted bymagnets) is brought into close proximity with an auto switchcylinder, it may absorb the magnetic force inside the cylinder,causing the auto switch to malfunction.WarningMaintenanceqPerform the following maintenance periodically inorder to prevent possible danger due to unexpectedauto switch malfunction.1)Secure and tighten switch mounting screws.If screws become loose or the mounting position isdislocated, retighten them after readjusting the mountingposition.2)Confirm that there is no damage to lead wires.To prevent faulty insulation, replace switches or repair leadwires, etc. when damage is discovered.3)Confirm that the green LED on the 2 color indicator lights up.Confirm that the green LED is on when the piston is stoppedat the established position. If the red LED is on, the mountingposition is not appropriate. Readjust the mounting positionuntil the green LED lights up.WarningOtherqConsult SMC concerning water resistance, elasticityof lead wires, etc.∗Lead Wire Color ChangesLead wire colors of SMC switches and related products have been changedin order to meet NECA (Nippon Electric Control Equipment IndustriesAssociation) Standard 0402 for production beginning September, 1996and thereafter.Special care should be taken regarding wire polarity during the time thatthe old colors still coexist with the new colors.2–wire systemOld New3–wire systemOld NewOutput (+) Red Brown Power supply + Red BrownOutput (–) Black BluePower supply GND Black BlueOutput White BlackSolid state with diagnostic output Solid state with latch diagnostic outputOld NewOld NewPower supply + Red BrownPower supply + Red BrownPower supply GND Black BluePower supply GND Black BlueOutput White Black Output White BlackDiagnostic output Yellow Orange Latch typeYellowdiagnostic outputOrangeActuator7