Hach sc200 User Manual

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Hach sc200 User Manual Manual pdf 19 page image

Wiring for powerW A R N I N GPotential Electrocution Hazard. Always disconnect power to theinstrument when making electrical connections.W A R N I N GPotential Electrocution Hazard. If this equipment is used outdoors or inpotentially wet locations, a Ground Fault Interrupt device must beused for connecting the equipment to its mains power source.D A N G E RElectrocution Hazard. Do not connect AC power to a 24 VDC poweredmodel.W A R N I N GPotential Electrocution Hazard. A protective earth (PE) groundconnection is required for both 100-240 VAC and 24 VDC wiringapplications. Failure to connect a good PE ground connection canresult in shock hazards and poor performance due to electromagneticinterferences. ALWAYS connect a good PE ground to the controllerterminal.1 2 T I & EInstall the device in a location and position that gives easy access to thedisconnect device and its operation.The controller can be purchased as either a 100-240 VAC poweredmodel or a 24 VDC powered model. Follow the appropriate wiringinstructions for the purchased model.The controller can be wired for line power by hard-wiring in conduit orwiring to a power cord. Regardless of the wire used, the connections aremade at the same terminals. A local disconnect designed to meet localelectrical code is required and must be identified for all types ofinstallation. In hard-wired applications, the power and safety groundservice drops for the instrument must be 18 to 12 AWG.Notes:• The voltage barrier must be removed before making any electricalconnections. After making all connections, replace the voltage barrierbefore closing the controller cover.• A sealing type strain relief and a power cord less than 3 meters(10 feet) in length with three 18-gauge conductors (including a safetyground wire) can be used to maintain the NEMA4X/IP66 environmental rating.• Controllers can be ordered with AC power cords pre-installed.Additional power cords may also be ordered.• The DC power source that supplies power to the 24 VDC poweredcontroller must maintain voltage regulation within the specified24 VDC-15% +20% voltage limits. The DC power source must alsoprovide adequate protection against surges and line transients.Wiring procedureRefer to the illustrated steps that follow and Table 1 or Table 2 to wirethe controller for power. Insert each wire into the appropriate terminaluntil the insulation is seated against the connector with no bare wireexposed. Tug gently after insertion to make sure that there is a secureconnection. Seal any unused openings in the controller box with conduitopening sealing plugs.(nglisK 13