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Smc Pneumatics Vqz1000/2000/3000 5

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P0907-P0982-E.qxd 08.9.1 3:06 PM Page 976 Series VQZ Specific Product Precautions 1 Be sure to read before handling. Refer to front matters 58 and 59 for Safety Instructions and pages 3 to 7 for 3/4/5 Port Solenoid Valve Precautions. Manual Override Light/Surge Voltage Suppressor Caution Caution Without an electric signal for the solenoid valve the manual override is used for switching the main valve. Push type is standard. Locking type (Tool required) is available as an option. 1. L/M-type plug connector (–) (+) Coil Varistor (–) (+) Push type (Tool required) Push down on the manual override button with a small screwdriver until it stops. Release the screwdriver and the manual override will return. +- Coil Varistor 2. DIN terminal With light/surge voltage suppressor (YS, YOS) Locking type (Tool required) Push down completely on the manual override button with a small screwdriver. While down, turn clockwise 90° to lock it. Turn it counterclockwise to release it. Coil Varistor Light/surge voltage suppressor (YZ) Locked position +- Coil LOCK PUSH Varistor With light (YZ) Coil Varistor Precautions When operating with a screwdriver, turn it gently using a watchmaker’s screwdriver. (Torque: less than 0.1 N폷m) How to Use L/M-Type Plug Connector Caution 1. Attaching and detaching connectors • To attach a connector, hold the lever and connector unit between your fingers and insert straight onto the pins of the solenoid valve so that the lever’s pawl is pushed into the groove and locks. • To detach a connector, remove the pawl from the groove by pushing the lever downward with your thumb, and pull the connector straight out. Cover Groove Pin Cover Groove Pin NL: Neon light Note) Surge voltage suppressor of varistor has residual voltage corresponding to the protective element and rated voltage; therefore, protect the controller side from the surge. 3. Surge voltage countermeasures When shutting off the DC power supply using an emergency circuit breaker, the valve may operate incorrectly due to surge voltage generated by other electric parts (e.g., the solenoid). To ensure that surge does not affect the valve, take anti-surge measures (diode for surge protection, etc.) or use a valve with diode to prevent reverse current. (Contact SMC for model numbers.) Circuit example Valve Valve Lever DC polarity indication -+ Connector Hook Solenoid load Socket Part no. DXT170-71-1 Lead wire Circuit breaker DC power supply q, e: Examples of anti-surge measures w: Valve equipped with diode to prevent reverse current 976 Courtesy of Steven Engineering, Inc.-230 Ryan Way, South San Francisco, CA 94080-6370-Main Office: (650) 588-9200-Outside Local Area: (800) 258-9200-www.stevenengineering.com