Innotech Genesis II Digital Controller (v5) - Manual (Page 80)

Genesis II Installation Instructions
Page 80 © Mass Electronics Pty Ltd 2010 Edition 2.0 dated 06/12/2013
4-1.2.2 Checking Digital Input Wiring
Digital input wiring to controllers and digital input expansion modules should be checked to ensure
the following conditions:
• The digital signal source voltage is within the correct range. Refer to Table 4-2 for digital input
signal source specifications for the various digital input units.
• The signal polarity is correct for digital input signals with DC sources
• Wiring to the signal actuator (switch, relay contacts, contact points, etc.) is correct
4-1.2.3 - External-Source Digital Inputs contains procedures for checking most Genesis REMs except
for the GENII DI REM Dry Contact Digital Input Module. Whereas most Genesis units use external
source digital input signals, the DI REM signals are dry contact (voltage free) inputs. Procedures for
checking voltage-free digital inputs are contained in 4-1.2.4 - Internal-Source Digital Inputs .
4-1.2.3 External-Source Digital Inputs
The following procedures for checking digital input wiring are specifically for the Genesis II Digital
Controller. However, they also apply to the other units listed in Table 4-2 except for the GENII DI REM.
Refer to the Electrical Installation chapter for digital input terminal numbers for the various Genesis
units.
Figure 4-2 is a schematic representation of a typical Digital Controller installation containing AC- and
DC-powered digital inputs and how the wiring can be checked using a digital voltmeter. Use Figure
4-2 for reference when performing the following procedures:
1. Ensure power to the Digital Controller is turned off.
2. Set the digital voltmeter range to read at least 25 Volts.
3. Connect the voltmeter to the first digital input channel (Terminals 4 and 5 for the Genesis II
Digital Controller). Observe polarity, ensuring the red (+) test lead is connected to the positive
terminal (4) and the black (-) test lead is connected to the negative terminal (5).
4. Ensure the voltmeter reads Zero Volts. If the reading is other than Zero Volts it indicates the
input is driven by Normally Closed contacts or the input is not wired correctly.
Table 4-2: Digital Input Signal Voltages
Unit Signal Voltage
GENII DDC Digital Controller 24VAC/24VDC ±15%
MPCII Mid Point Controller 24VAC/12VDC ±15%
GENII PI REM Pulse Input Module 12 - 24VDC
GENII IDI REM Opto-Isolated Digital Input Module 12 – 24VAC/VDC
GENII DI REM Dry Contact Digital Input Module
Not Applicable
GENII MP REM Multipoint Module 24VAC/24VDC ±15%