Emerson ROC827 instruction manual 6 I/O Wiring Requirements, Required Tools, Housing

ROC827 Instruction Manual

Install a surge protection device at the service disconnect on DC voltage source systems to protect against lightning and power surges for the installed equipment. All earth grounds must have an earth to ground rod or grid impedance of 25 ohms or less as measured with a ground system tester. You may also consider a telephone surge protector for the dial-up modem communications module.

A pipeline with cathodic protection is not a good ground. Do not tie common to the cathodic part of the pipeline.

When connecting shielded cable, be sure to tie the shielded cable to earth ground at the end of the cable attached to the ROC827 only. Leave the other end of the shielded cable open to avoid ground loops.

2.1.6 I/O Wiring Requirements

I/O wiring requirements are site- and application-dependent. Local, state, and NEC requirements determine the I/O wiring installation methods. Direct buried cable, conduit and cable, or overhead cable are all options for I/O wiring installations.

Shielded, twisted-pair cable is recommended for I/O signal wiring. The twisted-pair minimizes signal errors caused by Electro-Magnetic Interference (EMI), Radio Frequency Interference (RFI), and transients. Use insulated, shielded, twisted-pair wiring when using MVS signal lines. The removable terminal blocks accept 12 AWG or smaller wire.

2.2Required Tools

Use the following tools to perform installation and maintenance procedures on the ROC827. For tools required for installation or maintenance of accessories, refer to the ROC/FloBoss Accessories Instruction Manual (Form A4637).

ƒPhilips screwdriver, size 0.

ƒFlat blade screwdriver, size 2.5 mm (0.1 inch).

ƒFlat blade screwdriver, large, or other prying instrument.

2.3Housing

The housing case is made of a patented Acrylonitrile Butadiene Styrene (ABS) plastic (U.S. Patent 6,771,513) and the wire channel covers are made of polypropylene plastic.

Issued Mar-06 Installation and Use 2-5