Hach SC4500, Basic User Manual

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W A R N I N G
Explosion hazard. This manual is only for installation of the unit in a non-hazardous location. For
installation of the unit in hazardous locations, use only the instructions and approved control drawing
provided in the hazardous location installation manual.
N O T I C E
Install the device in a location and position that gives easy access to the disconnect device and its operation.
The controller can be purchased as either a 100-240 VAC powered model or a 18-28 VDC powered
model. Follow the appropriate wiring instructions for the purchased model.
Supply power to the instrument with conduit or a power cable. Make sure that a circuit breaker with
sufficient current capacity is installed in the power line. The circuit breaker size is based on the wire
gauge used for installation.
For installation with conduit:
• Install a local disconnect for the instrument within 3 m (10 ft) of the instrument. Put a label on the
disconnect that identifies it as the main disconnect device for the instrument.
• Rated for at least 90 °C (194 °F) and applicable to the installation environment
• For permanent connections use only solid wires. Use cable dimensions between 0.75 to 1.5 mm
2
(18 to 16 AWG). Flexible wires must have a crimped ferrule or pin type terminal on the end.
• Connect equipment in accordance with local, state or national electrical codes.
• Connect the conduit through a conduit hub that holds the conduit securely and seals the enclosure
when tightened.
• If metal conduit is used, make sure that the conduit hub is tightened so that the conduit hub
connects the metal conduit to safety ground.
• The DC power source that supplies power to the DC controller must maintain voltage regulation
within the specified 18-28 VDC voltage limits. The DC power source must also provide adequate
protection against surges and line transients.
For installation with a power cable, make sure that the power cable is:
• Less than 3 m (10 ft) in length
• Rated sufficient for the supply voltage and current.
• Rated for at least 90 °C (194 °F) and applicable to the installation environment
• Not less than 0.75 mm
2
(18 AWG) with applicable insulation colors for local code requirements.
Flexible wires must have a crimped ferrule or pin type terminal on the end.
• A power cable with a three-prong plug (with ground connection) that is applicable to the supply
connection
• Connected through a cable gland (strain relief) that holds the power cable securely and seals the
enclosure when tightened
• Does not have a locking type device on the plug
4.3.3.4 Connect conduit or a power cord
N O T I C E
The manufacturer recommends the use of manufacturer-supplied electrical components, such as power cord,
connectors and strain relief fittings.
N O T I C E
Make sure that the cable sheath goes through the inner side of the enclosure to keep the environmental
rating of the enclosure.
The controller can be wired for line power by hard-wiring in conduit or wiring to a power cord.
Regardless of the wire used, the connections are made at the same terminals.
The power cable plug is used to connect and disconnect power to the controller. For installation in
conduit, the installed local disconnect is used to connect and disconnect power to the controller.
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