Omni Installation Instructions
Page 80 © Mass Electronics Pty Ltd 2017Edition 1.2 dated 20.08.2018
Avoid risk of electrical shock, observe all local electrical safety requirements.
CAUTION
5-1.2.2 Checking Digital Input/Output Wiring
Digital input wiring to controllers and remote expansion modules should be checked to ensure the
following conditions:
•The digital signal source voltage is within the correct range
•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
5-1.2.3 External-Source Digital Inputs
The following procedures for checking digital input wiring are specifically for the Omni Digital
Controller and devices.
Refer to the Electrical Installation chapter for digital input terminal numbers for the various Omni
devices.
Figure 5-5 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
5-5 for reference when performing the following procedures:
1. Ensure power to the Digital Controller is turned o.
2. Set the digital voltmeter range to read at least 25 Volts.
3. Connect the voltmeter to the first input (Terminals 1). Observe polarity, ensuring the red (+) test lead is
connected to the positive terminal (+) and the black (-) test lead is connected to the negative terminal.
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.
5. With the voltmeter still connected, manually close the input contacts. If it is not possible to close the
circuit manually, connect a jumper wire across the contacts at the switching device.
6. Ensure the voltmeter indicates the proper signal voltage.
7. Ensure that the voltmeter indicates the correct polarity. The unit will not operate properly if the signal
polarity is incorrect.
8. Release the manually closed contacts or remove the temporary jumper from the switch contacts.
9. Repeat Steps 3 through 8 for the remaining digital input channels.
• Digital outputs are controlled by relays within the associated Omni device. These relays are connected to the
external circuits that can contain up to 24VAC.
• Procedures in this manual require checking these circuits with power applied. To avoid death or serious injury by
electrical shock, use extreme caution when working with energised circuits and follow precautions in this manual.
• Checks are to be performed only by qualified, licensed electricians who are familiar with local safety procedures.
Under no circumstances should anyone other than a qualified electrician perform these checks.
CAUTION
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