3 digital controller wiring, Nominal resistance for wire sizes at 20°c – Innotech Genesis II Digital Controller (v5) User Manual

Page 33

Page 33

Genesis II Installation Instructions

Chapter 3 – Electrical Installation

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 1mm² for

each conductor.

• The earth cable to a Genesis II System enclosures must be a minimum of 2.5mm², and wired in

accordance with local electrical regulations.

• For Analogue Inputs to the controller, a 16 conductor (0.5mm²) 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 this table to determine specific cabling requirements

for your installation.

3-3 Digital Controller Wiring

The following paragraphs contain input/output connection information for the Genesis II Direct

Digital Controller and the MPCII Mid Points Controller. The GEN2Config Software, which is used to

configure and program the digital controller, automatically produces a wiring diagram and materials

list for the specific application. The wiring diagram and materials list can be easily printed and used

for reference.

Conductor Area (mm²)

Diameter (mm)

Nearest SWG or

BWG

Nearest

AWG

Ohms per 100

metres

0.5

0.80

3.44

1.0

1.13

1.72

1.5

1.38

1.15

2.0

1.60

0.86

2.5

1.78

0.69

Table 3-1:

Nominal Resistance for Wire Sizes at 20°C

• 1. SWG = Standard Wire Gauge, BWG = British Wire Gauge, AWG = American Wire Gauge.

• 2. All SWG, BWG and AWG numbers are for the largest wire if a direct equivalent to the mm² wire size is not

available.

NOTE