1.2 check input and output wiring – Innotech Genesis II Digital Controller (v5) User Manual
Page 77
Page 77
Genesis II Installation Instructions
© Mass Electronics Pty Ltd 2010
Chapter 4 – Commissioning
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.
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 off.
• 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
2
for
each conductor.
• The earth cable to Genesis II enclosures must be 2.5mm
2
.
• For analogue inputs to the controller, a 16 conductor (0.5mm
2
) shielded cable is required.
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
to determine specific cabling requirements for your
installation.