Omni Installation Instructions
Page 78 © Mass Electronics Pty Ltd 2017Edition 1.2 dated 20.08.2018
Check 24VAC and 24VDC inputs as follows:
1. Ensure power to the device is turned o.
2. For 24VAC connection, ensure the AC Neutral is connected to Terminal 2 and the resistance between
Terminal 2 and the enclosure’s main earth link is 3.0 Ohms, or less.
3. Disconnect the power lead from Terminal 1.
4. Connect a digital volt-ohm-meter red (+) test lead to the disconnected power lead and the black (-)
test lead to Terminal 2.
5. Set the voltmeter to the VAC range to measure 24 Volts.
6. Turn on the power.
7. The voltmeter should read 24 Volts ±10%. For 24VDC units, make sure the power lead going to
Terminal 1 is positive and Terminal 2 is negative (although Omni devices are not polarity conscious).
8. Ensure measurement is in DC and not AC voltage.
9. Turn o the power.
10. Disconnect the digital voltmeter and reconnect the wire to Terminal 1.
11. Repeat Steps 1 through 9 for the remaining devices. For devices not included in this manual, refer to
the appropriate product datasheet.
POINT
24VAC
TRANSFORMER
EARTH
NEUTRAL
LIVE
VAC
VDC
<=3
VOLT-OHM
METER
Ω
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.
Figure 5-2: Checking Resistance
Figure 5-1: Omni Power Terminals
1 32
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