Horner-apg QX751 OCS Manual do Utilizador descarregar pdf (Página 21)

MAN0890-02-EN CH. 4

August 20, 2009 Page 21 of 96 ECN # 979

CHAPTER 4: ELECTRICAL INSTALLATION

4.1 Initial Electrical Installation

Initially, it is important to refer to the data sheet sent with the product in the box.

The datasheet covers model-specific information related to QX751 and Back Pack models such as:

a. Ports and Connectors

b. Wiring and Pin-outs

Visit our website (

http://www.heapg.com) to obtain updates to datasheets and user documentation.

4.2 Grounding Definition

Ground: The term Ground is defined as a conductive connection between a circuit or piece of

equipment and the earth. Grounds are fundamentally used to protect an application from harmful

interference causing either physical damage such as by lightning or voltage transients or from circuit

disruption often caused by radio frequency (RF) interference.

4.3 Ground Specifications

Ideally, a ground resistance measurement from equipment to earth ground is 0 ohms. In reality it typically

is higher. The U.S. National Electrical Code (NEC) states the resistance to ground shall not

exceed 25

ohms. Horner APG recommends less than 15 ohms resistance from our equipment to ground.

Resistance greater than 25 ohms can cause undesirable or harmful interference to the device.

4.4 How to Test for Good Ground

In order to test ground resistance, a Ground Resistance Tester must be used. A typical Ground

Resistance Meter Kit contains a meter, two or three wire leads, and two ground rods. Instructions are

supplied for either a two-point or three-point ground test.

Figure 4.1 shows a two-point ground

connection test.

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