Innotech Genesis II Digital Controller (v5) - Manual (Page 47)

Page 47
Genesis II Installation Instructions
© Mass Electronics Pty Ltd 2010 Chapter 3 – Electrical Installation
3-3.2.4 Analogue Inputs
The MPCII Mid Points Controller’s four Analogue Input channels allow the direct interface of various
analogue inputs, such as Thermistor, 0-10VDC, 0-5VDC and 4-20mA signals. Each Analogue Input
channel is configured to the type of input by the use of Analogue Input Signal Conditioners (AISCs).
These are small plug inserts installed during system commissioning ( Mechanical Installation ).
There are two terminals associated with each of the four analogue input channels. Normally, the
even-numbered (positive) terminal is used for the active Analogue Input signal from the sensor. The
odd-numbered (negative) terminal is used to provide the stimulation for the sensor or a voltage
reference (such as 0 Volts) for an active transducer.
Due to the sensitivity of the Analogue Input signals, screened cable must be used. The screens
should be terminated at the Screen Terminals, located between the Digital Input and Analogue Input
terminals on the MPCII Mid Points Controller.
The MPCII Mid Points Controller's Analogue Input terminals are not assigned numbers; however, each
Analogue Input terminal is clearly labelled as to its polarity and signal name. Signal names assigned
to the terminals are AI 1+/- through AI 4+/-.
Refer to Table 3-11 for Analogue Input terminal number assignments.
Screen Terminals, located between the Digital Input and Analogue Input terminals on the MPCII Mid Points
Controller, are provided for terminating Analogue Cable Screens.
NOTE
Special consideration must be made when using loop-powered 4-20mA inputs. As this type of input draws 20mA
from the Digital Controller, a maximum of two inputs of this type may be used. This type of input must not be used
on Remote Expansion Modules.
IMPORTANT
Active Reference
Terminal Signal Terminal Signal
AI 1 AI 1+ AI 1 AI 1-
AI 2 AI 2+ AI 2 AI 2-
AI 3 AI 3+ AI 3 AI 3-
AI 4 AI 4+ AI 4 AI 4-
Table 3-11: MPCII Mid Points Controller Analogue Inputs