Omni Installation Instructions
Page 38 © Mass Electronics Pty Ltd 2017Edition 1.2 dated 20.08.2018
3-4.2.1 Power Input
The Omni C40 Controller power requirements are either AC or DC as below:
•24VAC ±20%, 50/60 Hz
•24VDC (18-35VDC)
•Power Consumption: 30 Watts max. (load dependent)
The Omni C40 has polarity independent supply wiring. The 24V and 0V wiring can be used in either
terminal 1 or 2 per the image below.
The operating voltage must meet the requirements of Safety Extra Low Voltage (SELV) to EN60730.
The transformer used must be a safety transformer in compliance with EN60742 and be designed for
100% duty. It must also be sized and fused in compliance with local safety regulations.
Terminal AC Supply DC Supply
1 24VAC 24VDC
2 0VAC (Neutral) 0VDC
3 Earth Earth
Table 3-3: Recommended Wiring - C40
Figure 3-3: Omni C40/D 24V Input Terminals
1 32
Terminal 3 as shown above in Figure 3-3 MUST be Earthed.
CAUTION
The terminal numbering used in Figure 3-3 is only for identification purposes and does not relate to any numbering
on the physical controller or terminal.
Terminals 1 & 2 in the image below are not polarity conscious, meaning EITHER terminal can be 24V or 0V. For the
purposes of clarity in this document, terminal 1 will be used for 24V and terminal 2 for 0V.
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