Innotech Genesis II Digital Controller (v5) Manuel d'utilisateur télécharger pdf (Page 104)

Genesis II Installation Instructions

Page 104 © Mass Electronics Pty Ltd 2010Edition 2.0 dated 06/12/2013

5-3 Installation

It is not possible to cover all the situations that may be encountered in the wide range of installations

found in the field. The following examples are provided as a guide to assist in deciding the best

method of connection for a Genesis II System Installation.

Some situations require additional care to avoid hazardous situations. These may be covered by

legislation or regulations such as those set by Telecommunications Authorities, Electrical Wiring

Rules and Local Authorities.

Products of the Genesis II System product line are designed to comply with the Safety Extra Low

Voltage standards and, therefore, any wiring connected to these products should also comply with

these standards if the product compliance is to be maintained.

Communication links between equipment located within dierent electrical switchboards should

be electrically isolated from one another. The voltages at the earth connections at the switchboards

will usually have a small dierence under normal conditions but, if a fault occurs on equipment

connected to one switchboard, the voltage dierence can increase dangerously. If a non-isolated

communications link is used, this voltage dierence can cause a large current to flow through the

communications cable and the integrated circuits (ICs) connected to it. An isolated connection will

block the current, but it would have to withstand the full supply voltage for up to several seconds.

5-3.1 Network Specifications

The network type and baud rate determine the maximum recommended cable specifications. For

cable runs longer than the recommended lengths an Innotech Repeater IR11 or IR12 should be used.

Repeaters may also be required if the number of devices connected to a network segment exceeds

the maximum allowable number of devices for the specific network.

For detailed installation information, including installation on a system incorporating Innotech MAXIM series

devices, refer to DS 99.04 Installation Manual for Innotech Device Network Cabling.

NOTE

For specific instructions for the network installation of Innotech Devices, refer to DS 99.04 Installation Manual for

Innotech Device Network Cabling.

NOTE

5-3.2 Cable Specifications

Innotech recommends the use of cables specifically designed for RS485 networks. There are many

cables on the market that meet the specifications for RS485 networks.

Best reliability is achieved through a cable consisting of 2 individually shielded twisted pairs of low

capacitance. Such cables also provide excellent mechanical strength and lowest electrical resistance,

which is beneficial for maximum length cable runs.

Some CAT6 cable types may also be suitable in certain applications. Care should be taken when

using CAT6 for Primary Networks as they frequently omit shielding. CAT6 cables should be shielded in

order to provide reliable communications.

1 2 ... 99 100 101 102 103 104 105 106 107 108 109 ... 123 124

Pas de commentaire

Innotech Genesis II Digital Controller (v5) Manuel d'utilisateur Page 104