Innotech Genesis II Digital Controller (v5) Manuel d'utilisateur télécharger pdf (Page 77)

Page 77

Genesis II Installation Instructions

4-1.2 Check Input and Output Wiring

The purpose of checking the input and output wiring is two-fold. Firstly, the wiring is checked to

verify that it is connected properly, thus ensuring proper operation of the system. Secondly, the

wiring is also checked to ensure the absence of any external voltages that could damage a Genesis

unit. The following paragraphs contain instructions for checking inputs and outputs.

4-1.2.1 Checking Power Inputs

Power inputs must be checked to ensure that the applied voltage is of the proper level and, in the

case of DC power inputs, of the correct polarity. Table 4-1 shows the input voltage specifications for

the various types of units. Most units operate on 24VAC 10%, 50/60 Hz.

Controllers can be provided with an optional 24VDC ±10% power capability. Procedures for checking

the 24VAC and 24VDC units are similar, except that: for 24VAC units, AC Neutral must be at earth

potential and connected to Terminal 2. For 24VDC units, Terminal 1 must be positive and Terminal 2

negative.

4-1.1.2 Electrical Inspection

• Make sure all sources of electrical power, including power to ancillary items are o.

• Check all input and output connections against the computer-generated wiring diagram supplied

for your installation.

• Ensure all connections are in accordance with the wiring diagram and that connections are solidly

made.

• Ensure all enclosures are solidly earthed.

• Check all input and output cabling; ensure cabling requirements of Section 3 - Electrical

Installation are met.

• Make sure all cables, especially analogue input cables, are routed clear of high current, high

voltage or high speed switching current cables and other sources of interference.

• If using Remote Expansion Modules (REMs) make sure the cable run between does not exceed 600

metres in length.

• Inspect all cables running external to the enclosure. Ensure they are free from potential

mechanical damage, such as impacts and chafing.

Cabling plays an important role in the installation of Genesis II Systems. The following general

cabling guidelines should be observed:

• In all cases, use electromagnetic-shielded cable for sensor wiring.

• When necessary to protect cabling from physical damage, both shielding and physical protection

may be provided by running the cable in a metal conduit. Alternatively, use steel wire armoured

(SWA) cable, which also contains an electromagnetic shield.

• Avoid running cables in the vicinity of high voltage power cables or cables carrying switching

voltages/currents. This especially applies to sensor signal cables.

• Interconnecting cables must have multi-strand conductors with a cross-sectional area of 1mm

for

each conductor.

• The earth cable to Genesis II enclosures must be 2.5mm

• For analogue inputs to the controller, a 16 conductor (0.5mm

) shielded cable is required.

Table 3-1 provides assistance in determining the cabling requirements for various installation

configurations. It shows the dimensions, wire gauge designations and resistance values per unit

length for common wire sizes. Use Table 3-1 to determine specific cabling requirements for your

installation.

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Innotech Genesis II Digital Controller (v5) Manuel d'utilisateur Page 77

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